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2 years ago

Olivia is on a swing at the playground.

1 answer:

maks197457 [2]2 years ago

7 0

Olivia is on a swing at the playground. The kinetic energy is increasing and her potential energy decreasing at point X.

<h3>What is kinetic energy and potential energy?</h3>

The kinetic energy of an object is the ability to do work by virtue of its motion and potential energy is the ability to do work by virtue of its position.

At point W and Z, Olivia is at the maximum displacement from the mean position, where kinetic energy is zero and potential energy is maximum.

At point Y, it is approaching to increase its potential energy and decreasing kinetic energy. Opposite to this, at point X, kinetic energy is increasing and potential energy is decreasing.

Thus, the kinetic energy is increasing and her potential energy decreasing at point X.

Learn more about kinetic energy and potential energy.

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Satellite A orbits a planet at a distance d from the planet’s center with a centripetal acceleration a0. A second identical sate

leva [86]

To solve this problem it is necessary to use the concepts related to the Gravitational Force and Newton's Second Law, as far as we know:

$F_g = \frac{GMm}{r^2}$

Where,

G = Gravitational constant

M = Mass of earth (in this case)

m = mass of satellite

r = radius

In the other hand we have the second's newton law:

$F = ma$

Where,

m = mass

a = acceleration

Equation both equations we have,

$ma = \frac{GMm}{r^2}$

For the problem we have that,

<em>Satellite A:</em>

$ma_A = \frac{GMm}{r^2}$

<em>Satellite B:</em>

$ma_B = \frac{GMm}{(2r)^2}$

The ratio between the two satellites would be,

$\frac{ma_A}{ma_B}= \frac{\frac{GMm}{r^2}}{\frac{GMm}{(2r)^2}}$

Solving for a_B,

$a_B = \frac{a_A}{4}$

Therefore the centripetal acceleration of $A_B$ is a quarter of $a_A$

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3 years ago

describe the journey that light takes from the sun to your eye when you are looking at fish in a pond

Tcecarenko [31]

Rays of the light fast moves to the water and to the fish and then they are reflected

<u>Explanation:</u>

The movement of the light in the water and which to the fish taste of thence they are reflected by the upper surface of the water and reaches the eye, this results in The refraction in the lens of our eyes and it reaches the retina.
The retina consists of the photosensitive pigments that helps in the giving off the lights when the electrochemical neuronal activity reaches the brain of human beings

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2 years ago

Which of the following is NOT an advantage of using a wheel and axle?

kakasveta [241]

Answer:

the first one

Explanation:

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3 years ago

A 3kg box has 45J of gravitational potential energy, how high is it off the ground?

frez [133]

Answer:

1.53m

Explanation:

Given parameters:

Mass of box = 3kg

Gravitational potential energy = 45J

Unknown

Height of the box = ?

Solution:

To solve this problem;

Gravitational potential energy = mgh

m is the mass

g is the acceleration due to gravity

h is the height

45 = 3 x 9.8 x h

h = 1.53m

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3 years ago

Difference beteween phycial change and chemical change

pychu [463]

Answer:

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3 years ago