a boy of mass 54.2 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.4 m/s. the boy falls off the skateboard, and his center of mass moves forward at a speed of 11.1 m/s. find the final velocity of the skateboard.

Answer:

p = 11250 kg·m/s

Explanation:

Explanation:

it goes like this p=MV which is

M=750,V=15

p= 750x15=11250n

The circuit would have one battery with a positive and negative terminal. Connected to the positive terminal would be one switch and then two light bulbs in series. The other end of the two light bulbs in series would be connected to the negative terminal of the battery. Connected in parallel to the two light bulbs in series would be another two light bulbs. The positive end of the first parallel light bulb would be connected to the positive end of the second parallel light bulb. The other ends of both parallel light bulbs would be connected to the negative terminal of the battery. The first switch would be connected to the two light bulbs in series and would turn off only those two light bulbs when switched. The second switch would be connected to the two light bulbs in parallel and would turn off only those two light bulbs when switched.

In electronics, a series connection refers to a circuit in which the components (such as resistors, capacitors, or light bulbs) are connected end-to-end in a single path, so that the same current flows through each component in turn.

In a series connection, the voltage applied to the circuit is divided among the components according to their individual resistance or impedance values. The total resistance of a series circuit is equal to the sum of the individual resistances of each component.

In a series connection, the total voltage across the circuit is equal to the sum of the individual voltage drops across each component.

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Answer:

The three principles are often translated into and summarized as nationalism, democracy, and the livelihood of the people.

1. The problem in correlating the rock layers of location D is that there are no clear index fossils that can be used to determine the relative age of the rock layers.

2. Yes, there can be a problem in determining the time span of any rock layers without the use of index fossils. The age of a rock layer can only be estimated by comparing it to the ages of other rock layers in the area, which is done by examining the sequence of the layers and the type of fossils found in them. However, this method only provides a relative age range and not an exact age.

3. While fossils can provide important clues to the relative age of rock layers, they cannot be used to determine the exact age of a layer. This is because the age of a rock layer is determined by the decay of radioactive isotopes in the rock, which is a process that occurs over a long period of time.

4. The feature(s) of the fossils that make them ineffective in dating the relative age of rock layers is that they are not index fossils. Index fossils are usually species that have a widespread distribution and existed for a short period of time, making them useful for dating rock layers over a large area. The fossils listed (clam, nautilus, fusulina, sea urchin, gingko, and snail) may have existed for long periods of time, making them less useful for dating the relative age of rock layers.

Index fossils are distinctive fossils that are used to establish and compare the relative ages of rock layers in different locations. Without index fossils, it becomes difficult to determine which layers are older or younger relative to each other.

The "missing" rock layer could have been eroded away or never deposited in that location. This can occur due to natural processes such as erosion or deposition in a different location, or due to human activity such as mining or excavation. Without the missing layer, it becomes more difficult to accurately date the other rock layers in the area.

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1. What was the problem in correlating the rock layers of location D? Explain.

2. Was there a problem in determining the time span of any rock layers? Explain.

3. Why can't you determine the EXACT age of a layer of rock by simply observing fossils in a rock layer? What constraints you in making this determination?

4. There are fossils in location D that are not index fossils. What feature(s) of these fossils make them ineffective in dating the relative age (as a range of time) of rock layers? Note: The names of the fossils are listed below.  What "problem" most likely occurred that led to the missing rock layer? Explain

Answer:

The transition temperature is 0.920 K and the critical field at 0 K is 8.956 Wb/m².

Explanation:

To determine the transition temperature and critical field at 0 K, we need to use the following formula:

Bc(T) = Bc(0)[1-(T/Tc)^2]

where:

Bc(T) = critical magnetic field at temperature T

Bc(0) = critical magnetic field at 0 K

T = temperature

Tc = transition temperature

We have the critical fields at 6 K and 8 K:

Bc(6 K) = 7.616 Wb/m²

Bc(8 K) = 4.284 Wb/m²

We can use these values to find the transition temperature:

7.616 = Bc(0)[1-(6/Tc)^2]

4.284 = Bc(0)[1-(8/Tc)^2]

Dividing the two equations, we get:

7.616/4.284 = [1-(6/Tc)^2]/[1-(8/Tc)^2]

Simplifying the right-hand side:

7.616/4.284 = [(8/Tc)^2 - 1]/[(6/Tc)^2 - 1]

Let x = (8/Tc)^2

Then (6/Tc)^2 = x/64

Substituting into the equation above:

7.616/4.284 = (x - 1)/(x/64 - 1)

Simplifying:

7.616/4.284 = 64(x - 1)/(x - 64)

Multiplying both sides by (x - 64):

7.616/4.284 * (x - 64) = 64(x - 1)

Simplifying:

(x - 64)/(x - 1) = 7.616/4.284 * 1/64

Multiplying both sides by (x - 1):

x - 64 = 7.616/4.284 * 1/64 * (x - 1)

Simplifying:

x = 74.14

Substituting back into (8/Tc)^2 = x:

(8/Tc)^2 = 74.14

8/Tc = ±8.607

Tc = 0.920 K or 0.103 K

Since the transition temperature should be higher than the critical field at 0 K, we choose Tc = 0.920 K.

Now we can use either of the equations for Bc(T) to find Bc(0):

7.616 = Bc(0)[1-(6/0.920)^2]

Bc(0) = 8.956 Wb/m²

Therefore, the transition temperature is 0.920 K and the critical field at 0 K is 8.956 Wb/m².

The cone emits a single-frequency sound of 100 Hz and moves in a straightforward harmonic manner. The cone moves a maximum of 2.0 millimetres when it is making a loud sound.

Simple harmonic motion is a particular type of periodic motion of a body that arises from a dynamic equilibrium between an inertial force that is proportional to the acceleration of the body away from the static equilibrium position and a restoring force on the moving object that is directly proportional to the magnitude of the object's displacement and acts towards the object's equilibrium position.

In mechanics and physics, SHM is sometimes used to refer to this motion. If friction or any other energy dissipation is not present, it leads to an oscillation that is represented by a sinusoid and that lasts indefinitely.

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Answer:

a=  2.97m/s²

Explanation: mg = (M+m)a, with M the mass of the g

a= 100(230+100)g .

Answer: The initial potential energy of the block is converted into kinetic energy at the bottom of the track, and some work is done against friction. We can use conservation of energy to find the work done against friction:

Initial potential energy = Final kinetic energy + Work against friction

The initial potential energy is mgh, where m is the mass of the block, g is the acceleration due to gravity, and h is the initial height of the block (which is equal to the radius of the track):

Initial potential energy = mgh = (24 kg)(9.8 m/s^2)(26 m) = 60432 J

The final kinetic energy is given as 3700 J.

Plugging these values into the equation above, we can solve for the work done against friction:

Work against friction = Initial potential energy - Final kinetic energy

= 60432 J - 3700 J

= 56732 J

Therefore, the work done against friction is 56732 J

Explanation:

They get enough energy and high temperature to break their equal electric repulsion. The strong nuclear force will defeat the electric barrier once the nuclei are nearer & they can fuse as a final result.

A strong nuclear force can be used in this situation. Meson exchange between nucleons produces the intense nuclear force between them. This conversation is comparable to two persons striking a tennis ball or ping-pong ball back back and forwards continually.

The much more fundamental powerful force, also known as the strong interaction, has a byproduct known as the nuclear force. The quarks—elementary particles that make up protons and neutrons—are bound together by the strong interaction, which is an attractive force.

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Answer: To find the frictional force and normal force, we need to first find the gravitational force acting on the box, which is equal to its weight. We can find weight by multiplying the mass of the box by the acceleration due to gravity:

Weight = m * g

Weight = 33 kg * 9.8 m/s^2

Weight = 323.4 N

To find the x and y components of the tension force, we can use trigonometry:

Fx = Tension * cos(33°)

Fx = 283 N * cos(33°)

Fx = 237.34 N

Fy = Tension * sin(33°)

Fy = 283 N * sin(33°)

Fy = 154.13 N

Since the box is moving with constant velocity, we know that the net force on the box is zero. Therefore, the frictional force must be equal in magnitude and opposite in direction to the x component of the tension force:

Friction = -Fx

Friction = -237.34 N

The normal force is equal in magnitude and opposite in direction to the y component of the tension force:

Normal force = -Fy

Normal force = -154.13 N

Explanation:

The distance of the image from the concave mirror is -13.3 cm. So, A is the correct option.

Concave mirror is defined as the type of mirror, that has a reflecting surface which is curved inwards. It is also known as converging mirror.

Here,

Focal length of the mirror, f = 8 cm

Distance of the candle from the mirror, u = -5 cm

According to the mirror formula,

1/f = 1/v + 1/u

where v is the image distance.

Applying the values of f and u in the equation,

1/-8 = 1/v + 1/-5

1/v = (1/-8) - (1/-5)

1/v = 1/5 - 1/8

1/v = 3/40

Therefore,

v = 40/3 = 13.33 cm

Image distance, v = -13.3 cm

Hence,

The distance of the image from the concave mirror is -13.3 cm.

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Answer:

8 N

Explanation:

The net force formula is F = m×a

a = 2 m/s^2, m2 = 4 kg

So, now we can find F:

F = 4 × 2 = 8 N

Answer: 25230800 Joules

Explanation: We can treat the copper tank and the water inside as two different objects since they have different specific heats. We will utilize Q=Mcdelta(t) in this problem where M is mass, c is specific heat, and delta t is the change in temperature.

Since we are treating the copper and water separately we can make a Mcdelta(t) for each one of them. This gives us Q=(mass of copper)(specific heat of copper)(delta(t))+(mass of water)(specific heat of water)(delta(t)). The delta t will be the same because both the copper and water are at 15 celsius. Now we just do some calculations.

Q=(mass of copper)(specific heat of copper)(delta(t))+(mass of water)(specific heat of water)(delta(t))

Q=(20)(385)(55-15)+(150)(4200)(55-15)

Q=30800+25200000

Q=25230800 J

This number may seem absurdly high but there is 150 kg of water being heated up which is 150 liters(A LOT!).

Hope this helps!

The turn's radius of curvature is 0.04 meters. A 90 degree turn is completed by the bee in 0.628 seconds on average.

The radius of curvature of the turn can be calculated using the centripetal acceleration equation:

a = v² / r

where r is the radius of curvature, v is the speed, and an is the centripetal acceleration. When we rearrange this equation to account for r, we obtain:

r = v² / a

Inputting the values provided yields:

0.04 m is equal to r = (0.40 m/s)2 / 4.0 m/s2.

As a result, the turn's radius of curvature is 0.04 meters.

We can use the equation for the circumference of a circle to determine how long it takes the bee to complete a 90-degree turn:

C = 2πr

C/4 = (2πr)/4 = πr/2

The result of substituting the r value we discovered before is:

πr/2 = (π/2) (0.04 m) = 0.063 m

We can divide the distance travelled by the speed to determine the required amount of time:

t = d/v

t = (2πr)/v

When we replace the values we discovered above, we obtain:

t = (2π)(0.04 m) / 0.40 m/s = 0.628 s

As a result, the bee needs about 0.628 seconds to complete a 90-degree turn.

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The following theories contributed significantly to a more full knowledge of black body radiation. Light is made up of separate pieces that must be absorbed together.

A black body is an object that absorbed all radiation falling on it at all wavelengths. When a black body is at a constant temperature, its emission exhibits a temperature-dependent frequency distribution. It emits what is known as black-body radiation.

One of the first experiments that led to quantum mechanics was blackbody radiation. It all started with the basic observation that when you heat a metal, it first turns red, then yellow, and finally white hot as the temperature rises.

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3.17 x 10^-8 Newtons is the required gravitational force between them.

The gravitational force between two objects is given by the formula:

F = G * (m1 * m2) / r^2

where F is the gravitational force, G is the gravitational constant (6.6743 x 10^-11 N*m^2/kg^2), m1 and m2 are the masses of the two objects, and r is the distance between the centers of mass of the two objects.

In this case, the masses of the man and the woman are:

m1 = 80 kg

m2 = 65 kg

The distance between them is:

r = 10 m

Plugging these values into the formula, we get:

F = 6.6743 x 10^-11 * (80 kg * 65 kg) / (10 m)^2

F = 3.17 x 10^-8 Newtons

Therefore, the attractive gravitational force between the man and the woman is approximately 3.17 x 10^-8 Newtons.

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As waves come into contact with a barrier or aperture, they experience the phenomenon known as diffraction, which causes them to bend and disperse.

Diffracted light has maximum intensities at angles m given by dsinm=m when light is usually incident on a diffraction grating. Thus, the 3rd-order maxima can arise at 90° (or a smaller angle) and there won't be any 4th-order maxima because the maximum angle for diffraction maxima is 90°.

Light's wavelength determines the amount of diffraction, with longer wavelengths diffracted at a greater angle than shorter ones (in effect, red light are diffracted at a higher angle than is blue and violet light).

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Answer:

it is B

Explanation:

The terms "IF" and "THEN" are frequently used when writing the hypothesis. For instance, "I will not pass the test if I don't study." Your variables are reflected in the "if" and "then" lines. A solution is said to be acidic or basic depending on its pH value, which ranges from 7 to 14.

All compounds fall into one of three categories: basic (pH higher than 7), acid (pH or less 7), or neutral (pH about 7). The pH also indicates how powerful or weak the substance is. For instance, an item with a pH of 8 acts as a weak base, whereas an item with a pH of 3 is a powerful acid.

The hypothesis is essentially a prediction of what you believe will occur if you adopt a specific course of action to address an issue. The hypothesis often specifies what will change, what might result from the action, and why you believe the change is necessary.

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The shortest distance that can be travelled by road between the two towns, and at what angle would it face due west is 78.79km and Ф is 23.3°

We can create a right triangle with legs that are 32 km and 72 km apart if we join the tips of the distances from the west and south. The hypotenuse is the unidentified shortest length. The Pythagorean theorem enables us to state that According to the Pythagorean Theorem, The sum of the squares of the lengths of a right triangle's legs equals the square of the hypotenuse's length.

The right triangle's legs, a and b, are perpendicular sides, and the hypotenuse, c, is the side that faces away from the right angle.

This program is frequently employed in building projects and essentially anything that includes right triangles, like as roofs for homes, and soon.

h² = (32 km)² + (72 km)².

h²=1024+5184

h²=6208

h=√6208

h=78.79km

Angle=tan⁻¹(Ф)

so tan(Ф)=32/72

tan(Ф)=0.444

Ф=tan⁻¹(0.444)

  =23.3Degrees

H is equal to 78.79 in terms of value. As a result, the shortest  length of the route is about 78.79 km and angleФ is 23.3°.

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The correct option is A. which states that in the same liquid, the pressures are equal at all points that are at the same distance below the liquid surface.

This is because the pressure is determined by the weight of the liquid column above it, which is the same for all points at the same depth. The pressure along the vertical walls of the container is not equal because the liquid is in hydrostatic equilibrium which means that the pressure is not the same at all points in the liquid, and since the walls are vertical, the pressure is the same along them. The pressure at any point not touching any immersed objects is not equal to the pressure at any other point not touching any immersed objects because the pressure is determined by the weight of the liquid column above it, which is the same for all points not touching any immersed objects. The pressure is not affected by factors such as sunlight since the pressure at any point  in the sunlight is equal to the pressure at any other point not in the sunlight.

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The period of non-strenuous activity that slowly prepares the body for more vigorous exercise is called a warm-up. A warm-up is an essential part of any exercise routine as it helps to prepare the body physically and mentally for more intense physical activity.

Explain non-strengthening activity that gradually prepares the body for more strenuous exercise?

During a warm-up, the body's muscles, heart, and lungs gradually increase their activity levels, and the body's temperature begins to rise. This gradual increase in activity and temperature helps to reduce the risk of injury and improves performance during more intense exercise.

A typical warm-up can last between 5 to 15 minutes, depending on the intensity of the upcoming exercise. Some common warm-up activities include light aerobic exercises like jogging or cycling, dynamic stretching, and mobility exercises.

It is important to note that a warm-up should not be too strenuous activity , as this can cause fatigue and decrease performance during the main workout. Instead, it should be a gentle and gradual increase in activity level to prepare the body for the upcoming exercise.

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Answer:

c

Explanation:

trust

Answer:

pls mrk me brainliest

The creation of an individual's ethnic identity also includes their self-categorization Thermodynamics  within and psychological ties to their ethnic group (s).

Children's ethnicity gives them a sense of connection and helps them to understand who there are and where she came from. Nonetheless, ethnicity can cause conflicts between people, and children who belong to a minority ethnic group may grow despite looking less significant in society.

They point out that ethnicity, as a scientific term, enables researchers to distinguish between different people-groups based on their lineage, language, customs, philosophy, culture, or country without relying on the physical qualities that are essential to the notion of ethnicity (Atkinson et al., 1998).

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The radius of curvature for each surface of the thin convex lenses is 4 times the focal length (f).

Two spherical surfaces often make up an optical lens. The lens is referred to as a biconvex lens or just a convex lens if those surfaces are curved outwards. These lenses have the ability to focus an outside light beam to a spot on the opposite side by converging it.

The radius of curvature is always positive for convex lenses and always negative for concave lenses.

The relationship between the focal length (f), radius of curvature (R), and index of refraction (n) for a thin convex lens is,

1/f = (n - 1) * (1/R1 - 1/R2)

where R1 and R2 are the radii of curvature of the two surfaces of the lens.

Since the two radii of curvature for each of the two convex lenses are equal, we can simplify the equation to:

1/f = (n - 1) * (2/R)

R = radius of curvature for each surface of the lens.

We can rearrange this equation

R = 2 * f / (n - 1)

Substituting the given values of n = 1.5

R = 2 * f / 0.5

R = 4 * f

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We can use the following kinematic equations to solve the problem:

For Yaw:

a = 4.00 m/s^2

t = time taken by Kofi + 2.00 s (since Yaw started 2.00 s earlier)

s = distance covered by Yaw when Kofi starts

Using the equation s = ut + 1/2 at^2, we get:

s = 0 + 1/2 (4.00) (2.00)^2

s = 8.00 m

For Kofi:

a = 5.00 m/s^2

We want to find the time when Kofi overtakes Yaw, so we can use the equation:

s = ut + 1/2 at^2

Let t be the time taken by Kofi to overtake Yaw. At that time, their positions will be the same, so the distance covered by Kofi will be equal to the distance covered by Yaw plus 8.00 m. Hence,

1/2 (5.00) t^2 = 1/2 (4.00) (t - 2.00)^2 + 8.00

Simplifying and solving for t, we get:

t = 4.00 s

Therefore, Kofi overtakes Yaw after 4.00 s.

To find the distance Kofi travels before he catches Yaw, we can use the same equation:

s = ut + 1/2 at^2

Using t = 4.00 s and a = 5.00 m/s^2, we get:

s = 0 + 1/2 (5.00) (4.00)^2

s = 40.00 m

Therefore, Kofi travels 40.00 m before he catches Yaw.

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in a car race along a straight race course between Yaw and Kofi. both start from rest but Kofi leaves the starting line 2.00 s after Yaw does. Yav,; and Kofi maintain acceleration of 4.00 m S2 and 5.00 m S·2 respectively.​

Calculate the time at which kofi overtakes yaw

Calculate the distance kofi travels before he catches yaw.

Sunlight reflects off of Earth's curving surface at an angle that crosses the equator. Farther than the equator, sunlight is less concentrated or intense, which results in less warming of the Earth's surface.

More carbon dioxide, methane, & nitrous oxide are present in the upper orbit today than they have been in the previous 800,000 years. These releases of greenhouse gases have amplified the greenhouse effect and raised the earth's surface temperature.

Based on paleoclimatic information from fossil records, ice cores, sediments, and other methods of studying Earth's past, Gavin Schmidt, a climate scientist with NASA, estimated that it was approximately 125,000 years ago.

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Answer: Using conservation of energy, we can find the final speed of the roller coaster at the bottom of the hill:

Initial energy (at the top) = Potential energy + Kinetic energy

1/2 * m * vi^2 + m * g * h = 1/2 * m * vf^2 + m * g * 0

where m = 1000.0 kg is the mass of the roller coaster, vi = 10.00 m/s is the initial speed, h = 100.00 m is the initial height, g = 9.81 m/s^2 is the acceleration due to gravity, and vf is the final speed at the bottom of the hill.

Simplifying and solving for vf:

vf = sqrt(2 * g * h + vi^2)

Substituting the given values:

vf = sqrt(2 * 9.81 m/s^2 * 100.00 m + (10.00 m/s)^2)

vf = sqrt(1962.2)

vf ≈ 44.3 m/s

Therefore, the final speed of the roller coaster at the bottom of the hill is approximately 44.3 m/s.