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The car takes 2.41 seconds to reach a velocity of 85 km/h
Explanation:
If the car is moving along a vertical cliff, it means that its motion is a free fall motion, which is a uniformly accelerated motion. Therefore, we can use the following suvat equation:
where:
v is the final velocity
u is the initial velocity
is the acceleration of gravity
t is the time
For the car in this problem:
u = 0 is the initial velocity
is the final velocity
Solving for t, we find the time the car needs to reach this velocity:
Learn more about free fall motion here:
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Apple on tree branch has potential energy
We know that the measure of an incident ray is: α 1 = 40°.
The index of refraction:
- for the air : n 1 = 1.00,
- for the water: n 2 = 1.33
Snell`s Law of Refraction :
n 1 · sin α 1 = n 2 · sin α 2
sin α 2 = n 1 · sin α 1 / n 2 =
= 1.00 · sin 40° / 1.33 = 0.64278 / 1.33 = 0.4833
α 2 = sin ^(-1) 0.4833
α 2 = 28.9 °
Answer: The angle relative to the water`s surface of the rays when beneath the surface is 28.9°.