1. If a steam engine takes in 2.254 x 104 kJ from the boiler and gives up
1.915 x 104 kJ in exhaust during one cycle, what is the engine's efficiency?

What do you think car designers do if the damage caused by a crash test is too severe?

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?