1. A car accelerates from rest to 30 km/h. Later, on a highway it accelerates from 30 km/h to 60 km/h. Which takes more energy, going from 0 to 30, or from 30 to 60?
(a) 0 to 30 km/h.
(b) 30 to 60 km/h.
(c) Both are the same.
2. Engines, including car engines, are rated in horsepower. What is horsepower?
(a) The force needed to start the engine.
(b) The force needed to keep the engine running at a steady rate.
(c) The energy the engine needs to obtain from gasoline or some other source.
(d) The rate at which the engine can do work.
(e) The amount of work the engine can perform.