<p> Practice: Types of Energy</p><p>1. A moving car has kinetic energy. If it speeds up until it is going four times as fast, how much kinetic energy does it have in comparison?</p><p>2. Find the change in the potential energy of a 10-kg block as it is lowered 0.80 m. </p><p>3. How many joules of kinetic energy does a 1.2-kg book have when it is tossed across the room at a speed of 2 m/s?</p><p>4. A car is lifted a certain distance in a service station and therefore has potential energy relative to the floor. If it were lifted twice as high, how much potential energy would it have?</p><p>5. What is the elastic potential energy in a spring with a spring force constant of 135 N/m when it is stretched 0.2 m? </p><p>6. What is the elastic potential energy in a spring with a spring force constant of 15 N/m when it is stretched 0.5 m? </p><p>7. What minimum amount of work must the elevator do to lift a 60-kg person from the ground floor to the top floor of a 195-m high apartment building? HINT: The force is the person’s weight.</p><p>8. Two cars a lifted to the same elevation in a service station. If one car is twice as massive as the other, how do their potential energies compare?</p><p>9. How much work is done on a 75-N bowling ball when you carry it horizontally across a 10-m wide room?</p><p>10. Determine the work done by a string on a block as the block is lifted 0.80 m along the incline. The string tension is 50 N. Should this be positive or negative?</p><p>11. Dan Jansen of the United States won a speed-skating competition at the 1994 Winter Olympics in Lillehammer, Norway. He did this by skating 500 m with an average speed of 14 m/s. If his mass was 65 kg, what was his kinetic energy?</p><p>12. Susie Maroney from Australia set a women’s record in long-distance swimming by swimming 93,625 m in 24.00 h. What was Maroney’s average speed (in m/s)? If Maroney’s mass was 55 kg, what was her kinetic energy?</p><p>04e4e784c0364a669c51d3195f65e52b.doc</p>