Which shape fits a position vs. time graph of an object that is slowing down? Which shape fits a position vs. time graph of an object that is speeding up?

Given:

Different kinds of forces

To find:

Identify the contact forces and non-contact forces

Explanation:

A force that acts between two surfaces in contact is a contact force, while the force that acts between the two surfaces, not in contact, is a non-contact force.

The contact forces here are:

Sitting on a chair (friction)

Skateboard slows down on a rough surface (friction)

Slamming the door (friction)

Non-contact forces:

Magnet attracting paper clips (magnetic force)

Two like charges repel each other (electrostatic force)

When A peach falls from a tree (gravitational force)

If an object is following a curve, it means that it is changing direction. This change in direction will cause a change in velocity. Change in velocity causes acceleration. Since the velocity keeps changing, the acceleration is not zero. This also means that the net force is not zero. Therefore, you can safely assume:

There is a net force being applied

Part 1)

When a standing wave oscilates in an air-filled tube closed at one end and open at the other, the closed end is a node and the open end is an antinode. Then, the diagram of the wave inside the tube looks like the following:

Part 2)

The nodes are the points where the two curves intersect (darker regions) and the antinodes are the clearer regions.

Part 3)

In each wave on the diagram, the distance between two consecutive nodes or two consecutive antinodes is the same as half the wavelength.

Part 4)

The standing waves arise from the combination of reflection and interference of waves inside the air column when the wavelengths match the length of the tube in such a way that the open end is an antinode and the closed end is a node.

ANSWER

• I(toaster) = 15.08 A

• I(pan) = 11.17 A

• I(lamp) = 0.71 A

EXPLANATION

Given:

• The toaster's power, P(toaster) = 1810 W

• The frying pan's power, P(pan) = 1340 W

• The lamp's power, P(lamp) = 85 W

• The total current supported by the circuit, I = 15 A

• The voltage of the circuit, V = 120 V

Find:

• The current across each device

Power is the product of current and voltage,

We know that all three devices are connected in parallel, which means that they all have the same voltage, 120 V.

Solving the equation above for I,

So, for each device,

Hence, the current drawn by each device is:

• I(toaster) = 15.08 A

• I(pan) = 11.17 A

• I(lamp) = 0.71 A

ANSWER

1.61 m/s

EXPLANATION

Given:

• The distance the Slinky is stretched, d = 4 m

• The time it takes for the wave to travel the length mentioned before and back, t = 4.97 s

Find:

• The speed of the wave, v

We know that the wave takes 4.97 seconds to travel the 4 meters the Slinky was stretched and back, so it travels a total of 8 meters in that time. This means that the speed of the wave is,

Hence, the speed of the wave is 1.61 m/s.

The shortest distance in which you can stop, after the breaks are applied is 80.38 m.

The shortest distance in which you can stop is calculated by applying the principle of conservation of energy and work energy principle.

K.E = ¹/₂mv²

where;

K.E is your kinetic energy

m is your mass

v is your speed

The work done by force of friction before you stop is calculated as follows;

W = Ffx

where;

W = (μmg)x

where;

W = K.E

(μmg)x = ¹/₂mv²

(μg)x = ¹/₂v²

x = (v²) / (2μg)

x = (32²) / (2 x 0.65 x 9.8)

x = 80.38 m

Thus, the shortest distance in which you can stop, after the breaks are applied is determined by applying the principle of conservation of energy.

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The complete question is below:

Your are driving at 32 m/s, what is the shortest distance in which you can stop, after the brakes are applied, without the groceries sliding off the seat? The static and kinetic coefficients of friction are, respectively, 0.65 and 0.45. Assume that the surface of the seat is horizontal.

Given data

*A construction worker pushes a wheelbarrow at a distance is d = 5.0 m

*The given horizontal force is F = 250.0 N

The formula for the work is done by the worker on the wheelbarrow is given as

Substitute the known values in the above expression as

Hence, the work done by the worker on the wheelbarrow is W = 1250 J

When the acceleration is three times as large, the mass of the new block will be one-third the initial mass.

The acceleration of the block is the rate of change of velocity of the block with time.

The magnitude of the acceleration of each block can be obtained by applying Newton's second law of motion as follows;

F = ma

m = F/a

where;

When the acceleration is three times as large, the mass of the new block is calculated as;

m = F/3a

m = 1/3 (F/a)

new mass = one-third the initial mass

Thus, we can conclude that when the acceleration is three times as large, the mass of the new block will be one-third the initial mass.

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A student makes the following claim, "Acceleration is when an object changes speed, so it can be discussed as a scalar quantity." The error here is that acceleration is said to be done when either speed of that object changes or direction of that object changes. Hence , acceleration is not a scaler quantity.

Scalar quantities are quantities that only have a magnitude and  do not have any direction

A vector quantity is defined as the physical quantity that has magnitude as well as directions associated to it.

Acceleration is said to be occurred in two cases :

when the object changes its speed

or when the object changes its direction

since , acceleration depends upon both direction as well as magnitude ,hence it is a vector quantity not a scaler quantity.

for example : a stone attached to a string moving in a circular motion at a constant speed will be considered in accelerated motion because it is constantly changing its direction. Here we can see speed is constant hence magnitude (value of speed) is not changing but direction of the stone is changing . since , direction is changing the object is said to be in accelerated motion.

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Isothermal process: Temperature remains constant

Adiabatic process: No heat is exchanged to or from the system.

Isochoric process : Change in volume is zero.

ISobaric process : Pressure remains constant .

Answer. B

Given:

The mass when fully loaded with passengers is m =2078.1 kg

The height is h = 107.1 m

To find the potential energy of the roller coaster.

Explanation:

The potential energy of the roller coaster is given by the formula

Here, g= 9.8 m/s^2 is the acceleration due to gravity.

Substituting the values, the potential energy of the roller coaster will be

Final Answer: The potential energy of the roller coaster is 2181132.198 N

Given:

The mass of the Darin is m = 75.5 kg

The air resistance is

Required: Darin's acceleration.

Explanation:

According to Newton's second law, the downward force will be

Here, g = -9.8 m/s^2 is the acceleration due to gravity.

On substituting the values, the downward force will be

The net force will be

Final Answer: Darin's acceleration is -611.9 N

We will ave that the effective force is:

So, the effective force is 21.52 Pounds.

Given:

The mass of the child and the sled is,

The child acquires a speed at the bottom of the hill is,

To find:

The height of the hill

Explanation:

The potential energy at the top of the hill will be converted to the potential energy at the bottom of the hill. So for the hill of height 'h', we can write, the potential energy as

The kinetic energy is

So,

Hence, the height of the hill is 1.84 m.

Answer: For downwind sailing, with the sail oriented perpendicular to the wind direction, the pressure increase on the upwind side is greater than the pressure decrease.

Explanation: this is all i know

Answer:

Both parents could be heterogeneous: Hh.

Explanation:

Both parents could be heterogeneous.

Both parents are Hh.

H = 2 eyes , dominant trait

h = one eye, recessive trait

The childs genotype is hh.

The kinetic energy formula is

Where m = 1180 kg and v = 18.2 m/s.

Therefore, the kinetic energy is 195,431.6 Joules.

The values on the curve corresponding to the y axis are the y values

The values on the curve corresponding to the x axis are the x values

We would pick corresponding x and y values on the graph and compare them

On the graph, each small square represents 1 unit on both axes.

If x = 1, y = 1

If x = 4, y = 2

if x = 9, y = 3

We know that the square root of 1 is 1, the square root of 4 is 2 and the square root 9 is 3. This means that

y is the square root of x

The function is

Thus, it is a square root function

The first option is correct

There are 3 types of energy:

Kinetic energy(KE): energy of moving objects

Potential energy(PE): energy that an object has stored, position energy

Mechanical energy: The sum of both. PE+KE

Until 1897, atom was thought as the fundemental particle. But in 1897 J.J Thompson discovered that the atoms contains electrons. He discovered during his experiment with cathod ray tube.

Thus the correct answer is option C.

Answer:

Angle:

α =  - 62°

Explanation:

 Given:

Nₓ = 12.6 m

Ny = - 22.2 m

_________

α -  ?

The direction of  vector:

tg α = Ny / Nₓ

tg α = ( - 22.2 ) / 12.0 ≈ - 1.85

Angle:

α = arctg ( - 1.85) ≈ - 62°

The direction of the vector is [tex]\alpha=-62^o[/tex]. Given Components: Nₓ = 12.6 m and Ny = -22.2 m. The negative sign indicates that the angle is measured clockwise from the positive x-axis.

Finding the Tangent of Angle α:

  - The tangent of an angle α can be calculated using the formula: tan(α) = opposite/adjacent. In this case, the opposite side is Ny, and the adjacent side is Nₓ. So, you have:

    tan(α) = Ny / Nₓ

    tan(α) = (-22.2) / 12.6 ≈ -1.85

Finding the Angle α:

  - To find the angle α, you need to take the arctangent (inverse tangent) of the value you calculated above. This will give you the angle whose tangent is approximately -1.85:

    α = arctan(-1.85)

    α ≈ -62°

So, based on the given vector components Nₓ and Ny, the angle α is approximately -62 degrees.

The negative sign indicates that the angle is measured clockwise from the positive x-axis.

The angle obtained is in degrees. If you need the angle in radians, you could convert it using the relationship: radians = degrees × (π / 180).

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Given:

The current is,

The resistance is,

To find:

The potential across the battery

Explanation:

Using Ohm's law, we can write the potential across the battery is,

Hence, the potential across the battery is 10 V.

Given that a pendulum has a mean position as C, and two extreme points A and E.

We have to find the position of kinetic energy.

Here, the total energy is conserved. So, the sum of potential energy and kinetic energy is constant.

Potential energy increases with the increase in height.

At the extreme positions, A and E, potential energy are maximum and potential energy is zero at point C.

Also, Kinetic energy is zero is at points A and E.

As energy is conserved, Kinetic energy is maximum at point C and potential energy is zero.

To determine whether the given statement is true/false.

Explanation:

In nuclear reactors, after nuclear fission, energy is generated in the form of heat. This heat is used convert water steam.

In coal plant, burning coal produces steam.

Thus, the statement is true.

To transmit the same amount of electricity, there is a 2.5 W power loss.

A power loss is the difference in power between a device, piece of equipment, pump set, or process' input and output (Pv). Pumps, equipment, and procedures, as well as electrical and electronic devices, turn this undesirable loss into heat.

Consumers receive electric energy in different units than what power plants create. A fraction of the units is lost in the distribution network. This difference between the distributed and created units is referred to as transmission and distribution loss.

According to Ohm's law, power can be defined as

P = VI

Here,

V = Voltage

I = Current

replacing

100kW = 10WI

I = [tex]\frac{100}{10}[/tex]

I = 10 Amp

Now we can find the resistance

R = [tex]\frac{P_{LOSS} }{I^{2} }[/tex]

Replacing,

R = [tex]\frac{1000}{10^{2} }[/tex]

R = 10Ω

In the second state when the voltage is 200kv, we have,

I = [tex]\frac{100*10^{3} }{200*10^{3} }[/tex]

I= [tex]\frac{100000}{200000}[/tex]

I= 0.5 A

Now power loss,

[tex]P_{t}[/tex] = [tex]I^{2}[/tex]R

[tex]P_{t}[/tex] = ([tex]0.5^{2}[/tex]) (10)

[tex]P_{t}[/tex] = 0.25 *10

[tex]P_{t}[/tex] =2.5 W

As a result, 2.5W is needed to transport the same amount of electricity.

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Answer:

Definition- Electric power is the rate at which electrical energy is transferred by an electric circuit.

Answer:

the rate at which electrical energy is transferred by an electric circuit.

Explanation:

Given:

The initial speed of the ball is: u = 8.45 m/s.

The ball is thrown from the height: h = 29.9 m

To find:

The time ball takes to strike the ground.

Explanation:

The time taken by the ball to strike the ground can be determined by using the following equation.

Here, x = -29.9 m, u = -8.45 m/s and a = -9.8 m/s^2. The negative sign indicates that the ball is falling in the downward direction.

Substituting the values in the above equation, we get:

Solving the above quadratic equation, we get:

t = 1.754 s and t = -3.478 s

But the time is never negative, thus t = 1.754 s.

Final answer:

The ball takes 1.754 seconds to strike the ground.

(1)

The three eras within the Phanerozoic eon are

1) The Paleozoic era (541 million to 252 million years ago)

2) The Mesozoic era (252 million to 66 million years ago)

3) The Cenozoic era (66 million years ago to the present)

Given

Initial velocity, u=3.2 m/s

Final speed , v=14.9 m/s

Distance travelled, s=60 m

To find

Time taken to reach 9 m/s

Explanation

By equation of kinematics,

Let the time taken to reach 9 m/s be t

Thus

taking v=9 m/s here we have

Conclusion

The required time is 0.3 s