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Chapter 9: Q. 1 (page 227)
If a particle鈥檚 speed increases by a factor of 3, by what factor does its kinetic energy change?
It will change by a factor of 9
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A kg air compressor is dragged up a rough incline from m to m, where theaxis is vertical. How much work does gravity do on the compressor during this displacement?
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?
The force acting on a particle is . How much work does this force do as the particle moves along the x-axis from to ?
A pile driver lifts a weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of drives the pipe in . What is the average force exerted on the pipe?
a. Starting from rest, a crate of mass is pushed up a frictionless slope of angle by a horizontal force of magnitude . Use work and energy to find an expression for the crate鈥檚 speed when it is at height above the bottom of the slope.
b. Doug uses a N horizontal force to push a kg crate up a -m-high, frictionless slope. What is the speed of the crate at the top of the slope?
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