Answer:
Stars are at large distances that even light takes thousands of years to reach us from there.
for example, alpha centauri is 4300 light years away from earth and it is considered the nearest star to us, this means that light from there takes 4300 years to reach us and with a spaceships that can move with the speed of light is would take us 4300 years to get there which is imposible to live for that long.
hence, it is difficult to move between the stars.
Answer:
B) the change in momentum.
Explanation:
The impulse is defined as the product between the force applied on an object (F) and the duration of the collision (
):
(1)
We can rewrite the force by using Newton's second law, as the product between mass (m) and acceleration (a):

So, (1) becomes

Now we can also rewrite the acceleration as ratio between the change in velocity and change in time:
. If we substitute into the previous equation, we find

And the quantity
is equivalent to the change in momentum,
.
The answer is (a).
Golf balls have a higher density than water hence sink to the bottom.
16.33m
Explanation:
Given parameters:
Mass of the hiker = 75kg
Potential energy = 12000J
Unknown:
Height = ?
Solution:
The potential energy is the energy at rest of a body.
Potential energy = mgh
m is the mass of the hiker
g is the acceleration due to gravity
h is the height
The unknown is the height;
Height = 
Height =
= 16.33m
Learn more:
Potential energy brainly.com/question/10770261
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