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Chapter 9: Q. 18 (page 228)
The two ropes are used to lower a 255 kg piano 5.00 m from a second-story window to the ground. How much work is done by each of the three forces?
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Two identical horizontal springs are attached to opposite sides of a box that sits on a frictionless table. The outer ends of the springs are clamped while the springs are at their equilibrium lengths. Then a force applied to the box, parallel to the springs, compresses one spring by while stretching the other by the same amount. What is the spring constant of the springs?
You throw a g coin straight down at m/s from a -m-high bridge.
a. How much work does gravity do as the coin falls to the water below? b. What is the speed of the coin just as it hits the water?
A weather rocket generates a thrust of The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is , is anchored to the ground.
a. Initially, before the engine is ignited, the rocket sits at rest on top of the spring. How much is the spring compressed?
b. After the engine is ignited, what is the rocket’s speed when the spring has stretched
A horizontal spring with spring constant is compressed by and then used to launch a box across the floor. The coefficient of kinetic friction between the box and the floor is . What is the box’s launch speed?
A uniform solid bar with mass m and length L rotates with angular velocity v about an axle at one end of the bar. What is the bar’s kinetic energy?
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