The point of this question is to compare rest energy and kinetic energy at low speeds. A baseball is moving at a speed of 12 m/s. Its mass is 145 grams (0.145 kg).

a. What is its rest energy?
b. Calculate its kinetic energy using the formula
c. What is its kinetic energy?
d. Which is true?

1. The kinetic energy is much bigger than the rest energy.
2. The kinetic energy is approximately equal to the rest energy.
3. The kinetic energy is much smaller than the rest energy.

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?