Physics : Exam Questions & Answers

Physics : Exam Questions & Answers 60 mi/h is approximately - CORRECT ANSWER- 30. km/h A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is - CORRECT ANSWER- 49 N/cm A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding? - CORRECT ANSWER- 9000 N A 170 lb halfback is tackled by a 245 lb guard. Therefore, the guard has a greater force on the halfback than the halfback has on the guard. - CORRECT ANSWER- False - exert equal and opposite forces on each other A 170. pound halfback is tackled by a 245. pound guard. Each, of course, exerts a force on the other. Which of the players exerts the LARGER force on the other? - CORRECT ANSWERthey exert the same force on each other A 2.5-g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree's trunk. What force was exerted on the bullet in bringing it to a stop? - CORRECT ANSWER- -1.3 E3 N A 2.50-kg block (M) is on a flat frictionless surface (Fig. 5.30). This block is attached to a spring initially at its relaxed length (spring constant is 65.0 N/m). A light string is attached to the block and runs over a frictionless pulley to a 625-g dangling mass (m). If the dangling mass is released from rest, how far does it fall before stopping? - CORRECT ANSWER- 0.19 m A 200-N sled slides down a frictionless hillside that rises at 37 degrees above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled? - CORRECT ANSWER- 160 N A 32.0 kg block of ice slides down