1. After a 65-newton weight has fallen freely from rest a vertical distance of 5.3 meters, the kinetic energy of the weight is A) 12 J B) 340 J C) 910 J D) 1800 J 2. If the speed of a moving object is doubled, the kinetic energy of the object is A) halved B) doubled C) unchanged D) quadrupled 3. An object is thrown straight upward. Which graph best represents the relationship between the object's kinetic energy and the height of the object above its release point? [Neglect friction. ] B) Kinetic Energy Kinetic Energy Height Height C) D) Kinetic Energy Kinetic Energy Height Height 4. Two vacationers walk out on a horizontal pier as 5. As shown in the diagram below, a 0.50-meter-long shown in the diagram below. spring is stretched from its equilibrium position to a length of 1.00 meter by a weight. Unstretched spring Stretched spring 0.50 m 1.00 m As they approach the end of the pier, their gravitational potential energy will A) decrease B) increase Weight C) remain the same If 15 joules of energy are stored in the stretched spring, what is the value of the spring constant? A) 30. N/m B) 60. N/m C) 120 N/m D) 240 N/m Page 1Physics 6. In the diagram below, a student compresses the spring 1 1. A force of 100. Newtons is used to push a trunk to in a pop-up toy 0.020 meter. the top of an incline 3.0 meters long. Then a force of 50. Newtons is used to push the trunk for 10. meters along a horizontal platform. What is the total work TO.020 m done on the trunk? A) 8.0 x 102 J B) 5.0 x 102 J Uncompressed Compressed C) 3.0 x 102 J D) 9.0 X 102 J spring spring If the spring has a spring constant of 340 newtons per 12. An electrical heater raises the temperature of a meter, how much energy is being stored in the spring? measured quantity of water. The water absorbs 6,000 A) 0.068 J joules of energy from the heater in 30.0 seconds. B) 0.14 J What is the minimum power supplied to the heater? C) 3.4 J D) 6.8 J A) 5.00 x 102 W B) 2.00 x 102 W 7. A horizontal force of 5.0 newtons acts on a C) 1.80 x 105 W D) 2.00 x 103 W 3.0-kilogram mass over a distance of 6.0 meters along a horizontal, frictionless surface. What is the change 13. A boat weighing 9.0 x 102 Newtons requires a in kinetic energy of the mass during its movement horizontal force of 6.0 x 102 Newtons to move it over the 6.0-meter distance? across the water at 1.5 x 101 meters per second. The boat's engine must provide energy at the rate of A) 6.0 J B) 15 J C) 30. J D) 90. J A) 2.5 x 10-2 J B) 4.0 x 101 W 8. When 150 joules of work is done on a system by an C) 7.5 x 103 J D) 9.0 x 103 W external force of 15 newtons in 20. seconds, the total energy of that system increases by 14. A crane raises a 200-newton weight to a height of 50 meters in 5 seconds. The crane does work at the rate A) 1.5 x 102 J B) 2.0 x 102 J of C) 3.0 x 102 J D) 2.3 x 103 J A) 8 x 10-1 W B) 2 x 10' W 9. Which combination of units can be used to express C) 2 x 103 W D) 5 X 104 W work? A) newton . second meter B) newton . meter second C) newton/meter D) newton . meter 10. In the diagram below, a 20.0-newton force is used to push a 2.00-kilogram cart a distance of 5.00 meters. 20.0 N 2.00 kg The work done on the cart is A) 100. J B) 200. J C) 150. J D) 40.0 J Page 2Physics Base your answers to questions 15 and 16 on the information below. A runner accelerates uniformly from rest to a speed of 8.00 meters per second. The kinetic energy of the runner was determined at 2.00-meter-per-second intervals and recorded in the data table below. Data Table Speed (m/s) Kinetic Energy (J) 0.00 0.00 2.00 140. 4.00 560. 6.00 1260 8.00 2240 Kinetic Energy vs. Speed 2500. 2000 1500. Kinetic Energy (J) 1000. 500. 0.00 2.00 4.00 6.00 8.00 10.00 Speed (m/s) 15. Plot the data points for kinetic energy of the runner versus his speed. 16. Draw the line or curve of best fit. Page 3Physics Base your answers to questions 17 and 18 on the information and diagram below. A 250.-kilogram car is initially at rest at point A on a roller coaster track. The car carries a 75-kilogram passenger and is 20. meters above the ground at point A. [Neglect friction. ] 75 kg -250. kg AA 20. m Ground B 17. Calculate the total gravitational potential energy, relative to the ground, of the car and the passenger at point A. [Show all work, including the equation and substitution with units. ] 18. Calculate the speed of the car and passenger at point B. [Show all work, including the equation and substitution with units. ] Page 4