Answer:
The time is 0.563 ns.
Explanation:
Given that,
Index of refraction of glass = 1.41
Distance = 12.0 cm
Angle = 33.0°
We need to calculate the refraction angle
Using Snell's law

put the value into the formula



We need to calculate the velocity of beam in glass
Using formula of velocity

Put the value into the formula


We need to calculate the time
Using formula of distance





Hence, The time is 0.563 ns.
Answer: B. A magnet pulls a nail towards it
Explanation: Out of the list of answers, this is the only answer where a force is acting on an object. the act of the magnet pulling on the nail is the force, and the nail is the object.
28J because mechanical energy is the sum of the potential energy and kinetic energy