can you explain how he got 60/11 please! , i got boards tomorrow grade 10 . deciding to sit and study till morning :(!

The work done on an object by a constant force is given by the formula:

W = Fd cos(theta)

where:

W = work done (in joules)

F = applied force (in newtons)

d = displacement (in meters)

theta = angle between the force and displacement vectors (in degrees)

In this case, the force is in the same direction as the displacement, so the angle between them is 0 degrees. Therefore, we can simplify the formula to:

W = Fd

We are given that the work done is 100 J and the force is 30 N. Substituting these values into the formula, we get:

100 J = 30 N * d

Solving for d, we get:

d = 100 J / (30 N) = 3.33 meters

Therefore, the displacement is 3.33 meters.

When the magnets snap together, the kinetic energy of their motion is transformed into potential energy as they become magnetically attached.

This can be seen as an increase in the temperature of the magnets due to the friction produced as they come together. Additionally, sound waves are produced that are evidence of the energy being transformed from kinetic to potential.

When two magnets with opposite poles facing each other are held close to each other but not touching and released, the kinetic energy of their motion is transformed into potential energy as they become magnetically attached. This can be seen as an increase in the temperature of the magnets due to the friction produced as they come together, as well as sound waves that are evidence of the energy transformation.

What is Energy?

Energy is the ability to do work. It exists in many forms, such as kinetic, potential, thermal, electrical, chemical, and nuclear energy. It can be transferred from one form to another, and can be converted into other forms of energy.

What is Kinetic Energy?

Kinetic energy is the energy of motion. It is the energy of an object due to its movement, and can be calculated by taking the mass of the object and multiplying it by the square of its velocity.

What is Potential Energy?

Potential energy is the energy that an object has due to its position or configuration. It is the energy stored in an object as a result of its position relative to other objects, and can be converted into other forms of energy.

Energy is the ability to do work, and exists in many forms such as kinetic, potential, thermal, electrical, chemical, and nuclear energy. Kinetic energy is the energy of motion, while potential energy is the energy stored in an object due to its position relative to other objects. These two forms of energy can be converted into other forms, and can be used to do work.

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When the magnets snap together, the kinetic energy of their motion is transformed into potential energy as they become magnetically attached.

This can be seen as an increase in the temperature of the magnets due to the friction produced as they come together. Additionally, sound waves are produced that are evidence of the energy being transformed from kinetic to potential.

When two magnets with opposite poles facing each other are held close to each other but not touching and released, the kinetic energy of their motion is transformed into potential energy as they become magnetically attached. This can be seen as an increase in the temperature of the magnets due to the friction produced as they come together, as well as sound waves that are evidence of the energy transformation.

What is Energy?

Energy is the ability to do work. It exists in many forms, such as kinetic, potential, thermal, electrical, chemical, and nuclear energy. It can be transferred from one form to another, and can be converted into other forms of energy.

What is Kinetic Energy?

Kinetic energy is the energy of motion. It is the energy of an object due to its movement, and can be calculated by taking the mass of the object and multiplying it by the square of its velocity.

What is Potential Energy?

Potential energy is the energy that an object has due to its position or configuration. It is the energy stored in an object as a result of its position relative to other objects, and can be converted into other forms of energy.

Energy is the ability to do work, and exists in many forms such as kinetic, potential, thermal, electrical, chemical, and nuclear energy. Kinetic energy is the energy of motion, while potential energy is the energy stored in an object due to its position relative to other objects. These two forms of energy can be converted into other forms, and can be used to do work.

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The refractive index of the new medium is approximately 1.59.

Snell's law relates the angles of incidence and refraction of light passing through a boundary between two media with different refractive indices (n). The formula is:

n₁ sin θ₁ = n₂ sin θ₂

where n₁ is the refractive index of the first medium, θ₁ is the angle of incidence, n₂ is the refractive index of the second medium, and θ₂ is the angle of refraction.

In this problem, we know that the angle of incidence is 30.0 degrees and the angle of refraction is 18.0 degrees. We also know that the refractive index of air (n₁) is 1.00. Therefore, we can use Snell's law to solve for the refractive index of the new medium (n₂):

n₁ sin θ₁ = n₂ sin θ₂

1.00 sin 30.0° = n₂ sin 18.0°

n₂ = (1.00 sin 30.0°) / sin 18.0°

n₂ ≈ 1.59

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Answer:

67%

Explanation:

In the absence of external forces, the total momentum of the system before the collision is equal to the total momentum after the collision. Since the second ball is initially at rest, the total momentum before the collision is simply m*v.

After the collision, the two balls stick together and move with a common velocity, which can be calculated using conservation of momentum:

m*v + 0 = (m+2m) * v_final

Solving for v_final, we get:

v_final = v/3

The initial kinetic energy of the system is:

K_i = 0.5mv^2

The final kinetic energy of the system is:

K_f = 0.5*(3m)v_final^2 = 0.5(3m)(v^2/9) = 0.5m*v^2/3

The fraction of the initial kinetic energy lost on impact is:

( K_i - K_f ) / K_i = ( 1 - 1/3 ) = 2/3 = 0.67

Therefore, 67% of the initial kinetic energy is lost on impact.

Answer:

Medium - 3. a substance or material in which something exists or occurs

Transverse Waves - 5. waves in which the movement in the medium is perpendicular to the direction the wave is traveling

Surface Waves - 7. a wave that travels on the surface of the water in both transverse and longitudinal motions

Crest - 9. Highest part of the wave

Trough - 10. Lowest part of the wave

Interference - 1. the overlapping of 2 waves having equal amplitude and wavelength

Wave - 2. a disturbance that travels through a medium transporting energy from one location to another location

Amplitude - 8. Height of a wave

Longitudinal Waves - 6. waves in which the movement in the medium is parallel to the direction the wave is traveling

Mechanical Waves - 4. waves that require a medium in which to travel, involves a transfer of kinetic energy from one place to another in the material

(Please could you kindly mark my answer as brainliest you could also follow me so that you could easily reach out to me for any other questions)

The particle's location vector at time t is given by: r(t) = t³ + t² + 1

As per the question, we have the velocity of the particle in polar coordinates, but we need to find the position of the particle at time t. To do this, we need to integrate the velocity vector to obtain the position vector.

Let's consider the given velocity vector:

v(t) = (3t² + 2t)i + (2t² + 3t)j

To integrate this velocity vector, we need to find the corresponding position vector. Since the velocity vector is given in polar coordinates, we can express it in terms of polar variables:

v(t) = r'(t) + r(t)θ'(t)

where r'(t) and θ'(t) are the radial and angular components of the velocity vector, respectively.

By comparing the given velocity vector with the above equation, we can write:

r'(t) = 3t² + 2t

θ'(t) = (2t²+ 3t)/r(t)

Integrating r'(t) with respect to t, we get:

r(t) = t³ + t² + C

where C is the constant of integration.

To determine the value of C, we need to use the initial condition given in the problem. The particle starts at the position r = 1 and θ = π/4 at time t = 0. This implies:

r(0) = 1

θ(0) = π/4

Substituting these values in the equation for r(t), we get:

1 = 0 + 0 + C

C = 1

Therefore, the position vector of the particle at time t is given by:

r(t) = t³ + t² + 1

To find the value of θ at time t, we integrate θ'(t) with respect to t:

θ(t) = ∫(2t² + 3t)/r(t) dt

= ∫(2t² + 3t)/(t³ + t² + 1) dt

This integral is not trivial to solve analytically. Therefore, the position of the particle at time t can be expressed as:

r(t) = (t³ + t² + 1)i + f(t)j

where f(t) is the solution of the above integral for θ(t).

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We must first determine the amount of force needed to lift the boxes against gravity. The weight of the boxes is calculated as follows: 30 boxes x 6 kg/box = 180 kg

Work = Force x Distance Work = 1765.8 N x 1.5 m Work = 2648.7 Joules Force = Weight x Gravitational Acceleration Force = 180 kg x 9.81 m/s2 Force = 1765.8 N

The total work required to raise thirty 6 kilogram boxes onto a 1.5 m high shelf is therefore 2648.7 Joules.

Hence, the gravitational pull between two objects grows as their respective masses do as well. The force of gravity between two objects is equal to their respective masses multiplied by two. To put it another way, the gravitational potential energy directly relates to how high an item is above the earth. Consequently, an item needs be elevated higher in order to enhance its gravitational potential energy. The gravitational potential energy increases with height.

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Answer:

c.) 60 000j

Explanation:

c.) 1kj=1000j

60kjx1000

=60 000joules

The problem involves the image formation of a small object by a converging mirror.

According to the mirror equation, 1/f = 1/di + 1/do, where f is the focal length of the mirror, do is the object distance, and di is the image distance. In this case, the object is a baby mouse that is 1.2 cm high and located 4.0 cm away from the mirror. The mirror is a converging mirror with a focal length of 30 cm. To determine the image distance, we can use the mirror equation as follows: 1/30 = 1/di + 1/4. Solving for di, we get: di = 3.75 cm. This means that the image of the baby mouse is formed 3.75 cm behind the mirror. The size of the image can be determined using the magnification equation, M = -di/do, where M is the magnification. Substituting the values, we get: M = -(3.75 cm)/(4.0 cm) = -0.9375. The negative sign indicates that the image is inverted compared to the object. The magnification also tells us that the image is smaller than the object, with a height of: hi = Mho = (-0.9375)(1.2 cm) = -1.125 cm. Again, the negative sign indicates that the image is inverted. The absolute value of the height tells us that the image is smaller than the object, with a height of 1.125 cm.

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The center of mass of the thin plate is located at the point (16/3, 8/3) in the first quadrant.

To find the center of mass of a thin plate with a density of delta equals 5 bounded by the lines y equals x and x equals 0 and the parabola y equals 20 minus x squared in the first quadrant, we can use the following formula:

x = (1/M) ∫∫ x δ(x,y) dA

y = (1/M) ∫∫ y δ(x,y) dA

Now we can use this value of M to find the center of mass:

x = (1/M) ∫∫ x δ(x,y) dA

= (1/125) ∫₀²₀ ∫₀^x x 5 dy dx

= (1/125) ∫₀²₀ 5x²/2 dx

= 16/3

y = (1/M) ∫∫ y δ(x,y) dA

= (1/125) ∫₀²₀ ∫₀^x y 5 dy dx

= (1/125) ∫₀²₀ 5x(20-x²)/2 dx

= 8/3

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The magnitude of the resultant force on the object is approximately 12 N.

For the 5.0 N force:

Horizontal component = 5.0 N * cos(60°) ≈ 2.5 N

Vertical component = 5.0 N * sin(60°) ≈ 4.3 N

For the 8.0 N force:

Horizontal component = 8.0 N * cos(45°) ≈ 5.7 N

Vertical component = 8.0 N * sin(45°) ≈ 5.7 N

Next, we can add the horizontal and vertical components separately:

Resultant horizontal component = 2.5 N + 5.7 N ≈ 8.2 N

Resultant vertical component = 4.3 N + 5.7 N ≈ 10 N

Finally, we can use the Pythagorean theorem to find the magnitude of the resultant force:

Resultant force = sqrt((8.2 N)^2 + (10 N)^2) ≈ 12 N

The resultant force is the net force that acts on an object. It is the vector sum of all the forces acting on the object. If an object is subjected to multiple forces, the resultant force determines the direction and magnitude of the object's motion. If the resultant force is zero, the object will remain at rest or continue moving at a constant velocity. If the resultant force is non-zero, the object will accelerate in the direction of the force.

The concept of the resultant force is particularly important in dynamics, the branch of mechanics that deals with the motion of objects under the influence of forces. The laws of motion developed by Sir Isaac Newton, which are the foundation of classical mechanics, are formulated in terms of resultant forces. The first law states that an object at rest will remain at rest or move at a constant velocity unless acted upon by a net external force, while the second law relates the acceleration of an object to the net force acting on it.

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Given: mass of ice = 30g, specific heat of ice = 336 Jg^-1K^-1, specific heat of water = 4186 Jg^-1K^-1

Let x be the heat energy supplied to melt the ice. Heat energy required to raise the temperature of 30g of ice from 0°C to 0°C (its melting point) is given by: Q1 = mass x specific heat of ice x change in temperature, Q1 = 30g x 336 Jg^-1K^-1 x (0 - 0) = 0 J. Since 80% of the heat supplied completely melts the ice, the remaining 20% of the heat energy supplied is used to raise the temperature of the melted ice (now water) from 0°C to 0°C: Q2 = 0.2 x total heat energy supplied, Q2 = 0.2 x x. The total heat energy supplied is given by: total heat energy supplied = Q1 + Q2, x = (total heat energy supplied - Q1)/0.2, x = (336 Jg^-1K^-1 x 30g - 0)/0.2

x = 201600 J. Therefore, the total heat energy supplied to melt the ice completely to water at 0°C is 201600 J.

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Two spheres have identical charges and are 0. 012 m apart. The force between them is +0. 32 N. the magnitude of the charge on each sphere is approximately 2.14 × 10^-6 C.

The force (F) between two charged spheres with charges q1 and q2, separated by a distance r, is given by Coulomb's law:

F = (1/4πε₀) * (q1*q2/r^2)

where ε₀ is the electric constant.

In this problem, we are given the following information:

The charges on the two spheres are identical, i.e., q1 = q2 = q

The distance between the spheres is r = 0.012 m

The force between the spheres is F = +0.32 N

Using Coulomb's law, we can write:

q^2 = (F * r^2)/(1/4πε₀)

We know the value of F, r, and ε₀, so we can substitute these values to calculate q:

q^2 = (0.32 N * (0.012 m)^2)/(1/4πε₀)

q^2 = 4.57 × 10^-9 C^2

Taking the square root of both sides, we get:

q = ±2.14 × 10^-6 C

Since the charges are identical, we take the positive value of q, which gives:

q = 2.14 × 10^-6 C

Thus the value is, 2.14 × 10^-6 C.

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Mass times the body's acceleration is how force is calculated. m * a = 3000 * 2 = 6000 Newton is the formula for force, which is defined as mass times acceleration.

The definition of "force" is obvious. At this level, the phrases "push" and "pull" are entirely suitable to describe forces. A force is not something that exists inside or within an object. A force acts on the first thing from another.

These types of forces are present when two objects interact physically and physically come into contact with one another. The various types of contact forces include frictional, tensile forces, normal, air pressure, applied, and spring forces.

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Gravity has an acceleration of 9.8m/s2. However, this does not apply to the question since the acceleration of the car is 2 m/s². The net force required to accelerate the car is 6.000 kg m/s².

Acceleration is the rate of change of velocity. It is a vector quantity that is defined as the change in velocity divided by the change in time. Acceleration can be seen as the rate at which an object changes its speed or the rate at which its direction changes. Acceleration can occur in any direction, and can be either positive (speeding up) or negative (slowing down). In physics, acceleration can be caused by forces, such as gravity, friction, and air resistance, or by changes in the motion of an object, such as starting, stopping, turning, or changing speed.

F = ma

F = (3.000 kg)(2 m/s²)

F = 6.000 kg m/s²

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A stone falls from rest from the top of high tower. Ignore air resistance and take g=9.8m/s squared,  s = 30.625 m

Electrical resistance, which opposes the flow of current, is resistance to electricity. In this sense, it acts as a gauge for the difficulty of current flow. Ohms are a unit of measurement for resistance.

R stands for resistance, which is measured in ohms. A resistor is indeed a machine made to create resistance. You can use resistors to divide voltage, restrict current, or produce heat. The two most common varieties of resistors are fixed and variable.

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The amοunt οf heat required tο increase the temperature οf 480 kg water tο increase the temperature frοm 4°C tο 50°C is 9.3 × 10⁷ J.

The amοunt οf prοpane burned is 2kg.

Temperature is a numerical indicatοr οf hοw hοt οr cοld sοmething is. Atοms and mοlecules make up sοlids, liquids, and gases. The temperature οf that substance wοuld be lοw while these atοms and mοlecules are mοving slοwly. The temperature rises as the atοms and mοlecules mοve mοre quickly. The cοmbined energy οf these atοms and mοlecules in mοtiοn is knοwn as heat.

Cοnductiοn, cοnvectiοn and radiatiοn are the three methοds οf heat transfer.

Using the fοrmula:

H = m×s×ΔT

where,

H is the tοtal heat

m is the mass

and ΔT is the change in temperature.

substituting the values and sοlving fοr H,

H = 9.3× 10⁷ J

The amοunt οf prοpane required = H/h

where

H is the tοtal heat and,

h is the heat released by 1kg οf Prοpane.

Mass οf prοpane required= 2kg

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Answer:

Based on the data provided, it seems that the student is measuring the time period of a simple pendulum. The measured time periods are:

1.2 sec

1.23 sec

4.18 sec

1.25 sec

To find the mean time period, we add up all the measured values and divide by the total number of measurements:

Mean time period = (1.2 + 1.23 + 4.18 + 1.25) / 4 = 2.215 sec

To find the absolute error of each measurement, we subtract the mean time period from each measurement and take the absolute value:

Absolute error of 1st measurement = abs(1.2 - 2.215) = 1.015 sec

Absolute error of 2nd measurement = abs(1.23 - 2.215) = 0.985 sec

Absolute error of 3rd measurement = abs(4.18 - 2.215) = 1.965 sec

Absolute error of 4th measurement = abs(1.25 - 2.215) = 0.965 sec

To find the mean absolute error, we add up all the absolute errors and divide by the total number of measurements:

Mean absolute error = (1.015 + 0.985 + 1.965 + 0.965) / 4 = 1.23 sec

To find the percentage error of each measurement, we divide the absolute error of each measurement by the mean time period and multiply by 100:

Percentage error of 1st measurement = (1.015 / 2.215) * 100 = 45.9%

Percentage error of 2nd measurement = (0.985 / 2.215) * 100 = 44.4%

Percentage error of 3rd measurement = (1.965 / 2.215) * 100 = 88.8%

Percentage error of 4th measurement = (0.965 / 2.215) * 100 = 43.6%

Note that the third measurement has a significantly larger percentage error compared to the other measurements, which suggests that it may be an outlier or there may have been some systematic error in that particular measurement. It is important to carefully analyze such outliers and repeated experiments to ensure accurate results.

Answer:

inductance and genorator

Explanation:

Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The flow of electric current creates a magnetic field around the conductor. The field strength depends on the magnitude of the current, and follows any changes in current.

in which electrical wave changed into mechanical wave

Answer:

3 μC, -1 μC or -3 μC, 1 μC

Explanation:

As you can see in the image, let initial charges on two identical spheres be Q and q respectively (we are not considering the sign of q to be negative, value of q will be negative after solving)

initially,

[tex]-0.108 = \frac{KQq}{r^2}[/tex] …. (1)

where r = 0.5 meter (given in question),

after connecting a thin wire, both spheres tend to achieve the same potential conserving the total charge as initial, so after connecting a thin wire potential of both spheres become equal.

let q1 be the final charge on sphere 1 and q2 be the final charge on sphere 2,

[tex]\dfrac{Kq_1}{r} = \dfrac{Kq_2}{r}\\\\q_1 = q_2\\[/tex]... (2)

also, charge is conserved so total charge remains the same,

[tex]Q + q = q1 + q2[/tex] … (3)

if you solve equation 2 and 3, you will get the the final charges,

[tex]q_1 = q_2 = \dfrac{Q + q}{2}[/tex]

now after connecting the spheres the force equation becomes,

[tex]0.0360 = \dfrac{K\left(\dfrac{Q + q}{2}\right)^2}{r^2}[/tex] … (4)

divide the equation 2 by 4, after some simplification we get the below quadratic equation

[tex]3Q^2 + 10Qq + 3q^2 = 0[/tex]

divide the whole equation by [tex]q^2[/tex],

[tex]3\left(\dfrac{Q}{q}\right)^2 + 10\dfrac{Q}{q} + 3 = 0[/tex]

now this is a quadratic equation, after solving we get

[tex]Q = -3q[/tex]

(other solution also works, considering magnitude of charge on Q is more)

now substitute [tex]Q = -3q[/tex] in equation 2 and solve for q

q = 1 μC

Q = -3 μC

(you may consider Q = 3 μC and q = -1 μC)

Hopefully this answer will help you figure out the solution

The volume of air in the bottle at the cooler temperature is 1.064 L.

How to calculate volume of air at the cooler temperature?

To solve this problem, we can apply the Ideal Gas Law:

PV = nRT

where P is the gas's pressure, V is its volume, n is the number of moles in the gas, R is the ideal gas constant, and T is its absolute temperature.

Since the bottle is completely flexible, we can assume that the pressure inside the bottle remains constant throughout the process. Therefore, we can set the pressures of the gas at both temperatures equal to each other:

P1V1 = P2V2

where P1 and T1 are the pressure and temperature of the gas at the initial state (when it is hot) and P2 and T2 are the pressure and temperature of the gas at the final state (when it is cool).

We can rewrite this equation to find V2:

V2 = (P1/P2) * V1 * (T2/T1)

where V1 is the gas's initial volume.

Now, we can plug in the values:

V1 = 1.0 L

P1 = P2 (since the bottle is completely flexible)

T1 = 39 °C = 312 K

T2 = 20 °C = 293 K

The ideal gas constant R is 8.31 J/(mol*K), but we do not need to use it here since we are not given the number of moles of gas in the bottle.

Thus, we have:

V2 = (312/293) * 1.0 L = 1.064 L

Therefore, the volume of air in the bottle at the cooler temperature is 1.064 L.

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The largest displacement or distance a wave oscillates from its rest state is referred to as amplitude. It establishes the amount of energy a wave may carry by determining the strength or intensity of the wave.

Depending on whether the sun is rising or sinking, the amplitude is designated by the same names as the declination: E or W. The identified and named compass mistake is as follows: It is the distinction between the correct bearing and the compass.

The distance between a wave's peak or trough and the location of the medium at rest, also known as the equilibrium position, is often measured as the amplitude in transverse waves.

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Answer:

decreasing speed

Explanation:

so that way you have a faster reaction time

The decrease in kinetic energy during the collision is 1187.62 J.

Before the collision, the fullback's momentum is:

p1 = m1v1 = (87 kg)(5.0 m/s) = 435 kg*m/s (to the east)

The opponent's momentum is:

p2 = m2v2 = (97 kg)(-3.5 m/s) = -339.5 kg*m/s (to the west)

The total momentum before the collision is:

p1 + p2 = (435 kgm/s) + (-339.5 kgm/s) = 95.5 kg*m/s (to the east)

After the collision, the two players move together as one mass. Let vf be their common final velocity. Then the total momentum after the collision is:

p = (m1 + m2)vf = (87 kg + 97 kg)vf = 184 kg*vf (to the east)

Since momentum is conserved, we can equate the total momentum before and after the collision:

p1 + p2 = p

95.5 kgm/s = 184 kgvf

vf = 0.52 m/s (to the east)

Therefore, the velocity of the players just after the tackle is 0.52 m/s to the east.

To find the decrease in kinetic energy during the collision, we first need to find the initial kinetic energy:

KEi = (1/2)m1v1^2 + (1/2)m2v2^2

KEi = (1/2)(87 kg)(5.0 m/s)^2 + (1/2)(97 kg)(-3.5 m/s)^2

KEi = 1211.75 J

Since the collision is perfectly inelastic, the final velocity is the same for both players, and their combined mass is 184 kg. Therefore, the final kinetic energy is:

KEf = (1/2)mvf^2

KEf = (1/2)(184 kg)(0.52 m/s)^2

KEf = 24.13 J

The decrease in kinetic energy during the collision is:

ΔKE = KEi - KEf

ΔKE = 1187.62 J

Therefore, the decrease in kinetic energy during the collision is 1187.62 J.

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The tangential acceleration of the rollerblader is [tex]0 m/s^2[/tex], and her centripetal acceleration is [tex]0.42 m/s^2.[/tex]

The force you exert on the rollerblader is causing her to move in a circular path around the metal pole. This means that there must be a centripetal force acting on her, which is provided by the tension in the rope.

[tex]a = v^2 / r[/tex]

where a is the centripetal acceleration, v is the speed of the rollerblader, and r is the radius of the circle.

To find the speed of the rollerblader, we can use the fact that the tension in the rope is equal to the force you exert on her, which is 40 N. Therefore:

Tension = Centripetal force = [tex]m * a = m * v^2 / r[/tex]

[tex]40 N = (60 kg) * v^2 / 4 m[/tex]

[tex]v^2 = (40 N * 4 m) / 60 kg = 2.67 m/s[/tex]

[tex]v = \sqrt(2.67 m/s) = 1.63 m/s[/tex]

Now we can calculate the centripetal acceleration:

[tex]a = v^2 / r = (1.63 m/s)^2 / 4 m = 0.42 m/s^2[/tex]

Since the rollerblader is moving at a constant speed, her tangential acceleration is zero.

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The Lockheed U-2 or other high-flying aircraft's performance is likely to be unaffected by this disparity.

At an altitude of 70,000ft, the acceleration of gravity is slightly lower than the value at sea level due to the decrease in distance from the center of the Earth. However, this difference is typically small and is often ignored for the flight of airplanes in the Earth's atmosphere. The difference in acceleration of gravity between sea level and 70,000ft is approximately 0.006 m/s^2 or 0.06% of the value at sea level.

Therefore, the effect of this difference on the flight of the Lockheed U-2 or other high-flying aircraft is likely to be negligible and can be safely ignored for practical purposes.

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The crossover point is 56,000 miles, rounded to the closest whole number. The total cost of owning the hybrid vehicle and the alternative vehicle is the same at this point.

The formula for the total cost is :

Total Cost = Vehicle Purchase Cost + (Operating Cost per Mile x Miles per Year x Useful Life of Vehicle)/Miles per Gallon x Average Fuel Price per Gallon

For the hybrid vehicle:

Total Cost = $18,000 + ($0.14 x 16,500 x 14)/33 x $3.68 = $47,672.03

For the alternative vehicle:

Total Cost = $20,000 + ($0.10 x 16,500 x 14)/36 x $3.68 = $47,672.22

Solving these two equations for M gives :

$18,000 + ($0.14 x 16,500 x 14)/33 x $3.68 = $20,000 + ($0.10 x 16,500 x 14)/36 x $3.68

M = 55998

If the vehicle's expected mileage exceeds 56,000 miles, the alternative vehicle becomes more cost-effective; if it falls below 56,000 miles, the hybrid vehicle becomes more cost-effective.

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Work is done on the boxes as we push it around the store and on the piano when we drop it from the third floor  and work is not done on the locked door, on the dishes and on the bowling ball.

The work done is given by the dot product of the displacement and the force,

W = F.d

W = FdcosA, A is the angle at which the force is applied.

In the first scenario, the work is not done on the locked door that remains closed while we try to pull it open on the door as we push against it and open it, because there is no displacement.

Work in not done to pull a tablecloth out from under them and they remain in place on the dishes, because no displacement of the dishes.

Work is done on boxes as we lift them and place them on the shelf on a shopping cart as we push it around the store because displacement happened.

Work is done on the piano when we drop it from the third floor to the ground floor because A = 0 degrees.

Work is not done on the bowling ball that we are holding while waiting for our turn to bowl because A = 90 degrees.

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In one cycle of an engine, the net change in the entropy of both reservoirs (hot and cold together) is zero. This is because the entropy of each reservoir remains constant throughout the cycle.

Entropy is a measure of the randomness and disorder of a system, so the fact that the entropy of the two reservoirs remains constant throughout the cycle is a consequence of the law of conservation of energy. The engine cycle is designed so that the energy transfers between the two reservoirs cause the entropy of each reservoir to remain constant.

In an ideal cycle, the total amount of energy transferred from the hot reservoir to the cold reservoir is equal to the total amount of energy transferred from the cold reservoir to the hot reservoir. Thus, the net change in the entropy of both reservoirs is zero. This can be shown by examining the equation for the change in entropy of a system:

ΔS = Q/T, where Q is the energy transfer and T is the temperature.

The amount of energy transferred between the hot and cold reservoirs will be the same in both directions. Thus, the temperature ratio between the two reservoirs is the same. Since the energy transfer is the same, the change in entropy for both reservoirs is equal, and the net change in entropy is zero. This can be illustrated by the following equation:

ΔS = Q/T = Q/T + Q/T = 0.

In summary, the net change in the entropy is zero. This is due to the law of conservation of energy and the fact that the temperature ratio between the two reservoirs remains constant during the cycle.

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The ΔKtot represents the change in the total kinetic energy of the system, and the ΔUint represents the change in the total internal energy of the system.

Since the system consists of two objects, we can assume that the change in kinetic energy is due to the transfer of energy between the two objects, while the change in internal energy is due to a change in the potential energy of the system. The positive value of ΔKtot indicates that the total kinetic energy of the system has increased by 6 J. This means that one of the objects has gained kinetic energy while the other has lost the same amount of kinetic energy. This could happen if the two objects collided and transferred energy between each other. The negative value of ΔUint indicates that the total internal energy of the system has decreased by 3 J. This means that the potential energy of the system has decreased by the same amount, which could happen if the objects moved closer together and the force of attraction between them decreased. Overall, the change in kinetic energy and internal energy in the system shows that there has been a transfer of energy between the objects and a decrease in the potential energy of the system. This suggests that the objects may have undergone a collision or moved closer together due to the force of attraction between them.

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 The magnitude of the electric force between the charges 0. 12 C and 0. 33 C at a separation of 2. 5 m is 4.987 N. If the charges are of the same sign, the force will be repulsive; if they are of opposite signs, the force will be attractive.

We can use Coulomb's law to find the magnitude of the electric force between two charges:

F = k * ([tex]q_{1}[/tex] *  [tex]q_{2}[/tex]) / [tex]r^{2}[/tex]

where F is the magnitude of the force, k is Coulomb's constant (9 x [tex]10^{9}[/tex]10^9 N*[tex]m^{2}[/tex]/[tex]C^{2}[/tex]), [tex]q_{1}[/tex] and [tex]q_{2}[/tex] are the magnitudes of the charges, and r is the separation between the charges.

Plugging in the given values, we get:

F = (9 x  [tex]10^{9}[/tex] N*[tex]m^{2}[/tex]/[tex]C^{2}[/tex]) * ((0.12 C) * (0.33 C)) / (2.5 m)^2

Simplifying:

F = 4.987 N

Therefore, the magnitude of the electric force between the charges is approximately 4.987 N.

To determine whether the force is attractive or repulsive, we need to know the signs of the charges.

Since the problem does not specify the signs of the charges, we cannot determine whether the force is attractive or repulsive.

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