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2 years ago

Which is the best example of potential energy?

2 answers:

8 0

First one, holding a basketball in the air. Potential energy is the energy it has mostly from gravity. The further you go from the center of mass, the more energy.

BaLLatris [955]2 years ago

5 0

Before coming into conclusion first we have to understand potential energy.The potential energy of a body is defined as the energy possessed by a body due to its position and configuration.

There are generally two types of potential energy.One is gravitational potential energy and the other one is elastic potential energy.The former one is due to the position of the body at a certain height from the surface of earth.The latter one is due to the change in configuration of the body.

There is also electric potential energy which is stored inside the electric filed of charge particles at rest.

The first example is holding a basket ball in air.As the body is at certain height from earth surface ,hence it has gravitational potential energy which is a best example of potential energy.

The second one is a rolling ball across a flat table.It has both rotational kinetic energy due to its rolling motion as well as potential energy due to its position.

The third one can't be considered as it is electric in nature.

The fourth one is turning on a flashlight in a dark room.The light is due to the heating effect of electric current. so it is not gravitational in nature.

Hence option one is the correct answer.

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A group of cells working together make up a(n)

Neko [114]

Answer: Tissue.

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2 years ago

Show the weight of the ladder and draw the missing Frictional force.

madreJ [45]

Since there is no friction between the ladder and the wall, there can be no vertical force component. That's the tricky part ;)

So to find the weight, divide the 100N <em>normal</em> force by earths gravitational acceleration, 9.8m/s^2

$W = \frac{N}{g} = \frac{100N}{9.8m/s^{2}} = \frac{100}{9.8} = 10.2kg$

Then;
Draw an arrow at the base of the ladder pointing towards the wall with a value of 30N, to show the frictional force.

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2 years ago

The specialty of an athlete on the women's track team is the pole vault. She has a mass of 48 kg and her approach speed is 8.9 m

Lyrx [107]

Answer:

H = 3.9 m

Explanation:

mass (m) = 48 kg

initial velocity (initial speed) (U) = 8.9 m/s

final velocity (V) = 1.6 m/s

acceleration due to gravity (g) = 9.8 m/s^{2}

find the height she raised her self to as she crosses the bar (H)

from energy conservation, the change in kinetic energy = change in potential energy

0.5m(V^{2} - [test]U^{2}[/tex]) = mg(H-h)

where h = initial height = 0 since she was on the ground

the equation becomes

0.5m(V^{2} - [test]U^{2}[/tex]) = mgH

0.5 x 48 x (1.6^{2} - [test]8.9^{2}[/tex]) = 48 x 9.8 x H

-1839.6 = 470.4 H (the negative sign indicates a decrease in kinetic energy so we would not be making use of it further)

H = 3.9 m

4 0

3 years ago

Which is not a device for reproducing sound?

Alona [7]

Phonograph. Hope that helps

7 0

2 years ago

Do you think that the formation of a rainbow is more a demonstration of the wave-like or particle-like behavior of light

kogti [31]

Answer:

The formation of a rainbow is more a demonstration of the wave-like behavior of light.

Explanation:

A rainbow is caused by the interaction of sunlight with atmospheric conditions. A rainbow formation results from the refraction and reflection of light due to changes in the light's wavelength direction. Naturally, light enters a water droplet, slowing down and bending as it goes from air to denser water in a refraction as if "bent." Then light reflects off the inside of the droplet, separating into its component wavelengths or colors. With light exiting from the droplet, a rainbow is formed.

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2 years ago