Part A Which of these is exhibiting kinetic energy?
1 answer:
Answer:
a space station orbiting Earth
Explanation:
Kinetic energy in an object arises from the motion of the object.
is the kinetic energy of object.
(a) a person sitting on a couch while watching TV
The person is still and is not in motion and thus, do not exhibit any kinetic energy.
(b) an archer with a flexed bow
The archer hold the bow flexed. It may have a lot of potential energy but not kinetic energy as it is still.
<u>a space station orbiting Earth</u>
<u>The space station is moving and is in motion and thus, exhibits kinetic energy.</u>
(c) a rock on a mountain ledge
The rock is on a mountain ledge . It may have a lot of potential energy but not kinetic energy as it is still.
(d) the high-energy phosphate bonds of a molecule of ATP
The bonds are still and is not in motion and thus, do not exhibit any kinetic energy.
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Answer:
F = 0.00156[N]
Explanation:
We can solve this problem by using Newton's proposed universal gravitation law.
Where:
F = gravitational force between the moon and Ellen; units [Newtos] or [N]
G = universal gravitational constant = 6.67 * 10^-11 [N^2*m^2/(kg^2)]
m1= Ellen's mass [kg]
m2= Moon's mass [kg]
r = distance from the moon to the earth [meters] or [m].
Data:
G = 6.67 * 10^-11 [N^2*m^2/(kg^2)]
m1 = 47 [kg]
m2 = 7.35 * 10^22 [kg]
r = 3.84 * 10^8 [m]
This force is very small compare with the force exerted by the earth to Ellen's body. That is the reason that her body does not float away.