Chapter 9: 9.Q. 4 (page 227)
A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface. How much work is done by
(a) tension and (b) gravity?
a) 30 J
b) 0 J
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A -cm-long spring is attached to the ceiling. When a kg mass is hung from it, the spring stretches to a length of cm.
a. What is the spring constant?
b. How long is the spring when a 3.0 kg mass is suspended from it?
A horizontal spring with spring constant N/m is attached to a wall. An athlete presses against the free end of the spring, compressing it cm. How hard is the athlete pushing?
A kg particle moving along the axis experiences the force shown in FIGURE. The particleโs velocity is m/s at m. What is its velocity at m and m?
An kg crate is pulled m up a incline by a rope angled above the incline. The tension in the rope is N, and the crateโs coefficient of kinetic friction on the incline is .
a. How much work is done by tension, by gravity, and by the normal force?
b. What is the increase in thermal energy of the crate and incline?
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 crateโs 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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