Answer the following grade 12 physics multiple choice questions

1. A child pulls a 7.4-kg toboggan 4.2 m across level ground with a 15-N force that is 34 above the horizontal. The work done is a. 35 J d. 390 J b. 52 J c. 2100 J c. 63 J 2. A student in a lab exerts a 25 N force to pull a block a distance of 48 cm. If a total of 1 1 J of work is done, the angle between the force and the displacement is a. 89 d. 24 b. 66 c. none of the above C. 610 3. The kinetic energy of a 24-kg dog running at 22 km/h is a. 450 J d. 260 J b. 5800 J c. 73 J c. 12000 J 4. A 75-kg parachutist jumps from a plane at a height of 1.2 km. At the instant he leaves the plane, his gravitational potential energy compared to the plane is a. 880 J d. -880,000 J b. -8800 J c. OJ c. 880,000 J 5. A student has 474 J of gravitational energy while standing on a stool 0.84 m above the ground. The mass of the student is a. 580 kg d. 40 kg b. 48 kg c. 65 kg c. 58 kg As a student lifts a 4.5-kg book bag 120 em into the air, the amount of work that the force of gravity does on the bag is a. 5.4J d. -5.4 J b. 53 J c. -53 J C. 540 J 7. A student exerts a force of 12 N to compress a spring 2.54 cm. The force constant for the spring is a. 0.30 N/m d. 31 N/m b. 4.7 N/m c. 470 N/m C. 15 N/m 8. A spring with a force constant of 2.1 x 10" N/m compresses 3.5 em when stepped on by a boxer. The mass of the boxer is a. 65 kg d. 82 kg b. 73 kg c. 740 kg c. 75 kg 9. In the picture of a roller coaster track shown right, the point where the roller coaster car would be travelling the fastest, under negligible friction is a. A d. D b. B e. E C 10. In the picture of a roller coaster track shown right, the point where the roller coaster car would be travelling the slowest B under negligible friction is a. A d. D b. B c. E C