Lea-Burque: Pág. 80. 55. A repairman, working at the top of an elevator shaft, 60 m above the elevator car, is startled by the sound of the elevator starting upward and drops his wrench. if the elevator car accelerates upward at 0,1g for 3 s and then runs at constant speed, how far does the wrench fall before striking the elevator car?.
Lea-Burque: Pág. 80. 56. Claire is standing at the edge of a steep cliff when a boulder comes loose from the edge and falls directly downward toward the lake below. Clarice hears the sounds of the boulders hitting the water 7 s later. If the speed of sound is 340 m/s, how high is the cliff?
Tippler-Mosca: Pág. 48. 77. A load of bricks is being lifted by a crane at a steady velocity of 5 m/s when one brick falls off 6 m above the ground.
a. Sketch x(t) to show the motion of the free brick.
b. What is the greatest height the brick reaches above the ground?
C. What is its speed just before it hits the ground?
a. Sketch x(t) to show the motion of the free brick.
b. What is the greatest height the brick reaches above the ground?
C. What is its speed just before it hits the ground?
Tippler-Mosca: Pág. 48. 78. A bolt comes loose from underneath an elevator that is moving upward at a speed of 6 m/s. The bolt reaches the botton of the elevator shaft in 3 s.
How high up is the elevator when the bolt comes loose?.
What is the speed of the bolt when it hits the botton of the shaft?
How high up is the elevator when the bolt comes loose?.
What is the speed of the bolt when it hits the botton of the shaft?
