30. Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0° slope at constant speed, as shown below. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by the gravitational force on the sled? (d) What is the total work done? 60° 13

30. Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0° slope at constant speed, as shown below. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by the gravitational force on the sled? (d) What is the total work done? 60° 13

Name: 30. Suppose the ski patrol lowers a rescue sled and victim, having a
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Description: 30. Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0° slope at constantspeed, as shown below. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done byfriction

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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1.A person is pushing a box across a floor. Can the frictional force on the box ever exceed its own weight? Can the frictional force ever exceed the applied force? Illustrate and solve the following problems. 2. A 500 – N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.40. (a) Find the work done in pushing the box 20 m. (b) How much work went into overcoming friction and how much into accelerating the box? 3. A 60-lb wooden box is pushed a distance of 50 ft on a horizontal stone floor by a force just sufficient to overcome the friction between box and floor. The coefficient of kinetic friction is 0.40. (a) What is the required force? (b) How much work does the force do? 4. A horizontal force of 5.0 N is used to push a box up a ramp 5.0 m long that is at an angle of 15° above the horizontal. How much work is done by the force? 5. A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his…
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1B. A crate of mass 10.0 kg is pulled up a rough 200- incline. The pulling force is 100 N parallel to the incline. The coefficient of kinetic friction is 0.4 and the crate is pulled 5.0 m. (a) How much work is done by gravity? (b) How much energy is lost due to friction? (c) How much work is done by the 100N-force?
1. Two blocks are connected by a very light string passing over a massless and frictionless pulley. (See Figure below). Travelling at a constant speed, the 20 N block moves 75 cm to the right and the 12 N block moves 75 cm downward. During this process, how much work is done (a) on the 12 N block by (1) gravity and (i) the tension in the string. (b) on the 20 N block by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) normal force? (c) find the total work done on each block. 20.0 N Tension is the pulling force exerted by a cord on an object to which it is attached. 12.0 Figure 1.1 Problem 1
After being pushed (no matter what force) an object with mass 100 kg covers a distance of 15 m before stops because a frictional force of 20 N, what is the work done by that force? Caution: consider the friction acting in opposite direction of motion. Hint: Work consider all the acting forces.
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30.Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0° slope at constant speed, as shown below. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by the gravitational force on the sled? (d) What is the total work done? 60° W T
1. Pete lifts a 500 Newton barbell to a height of 1.2 meters. (a) How much force must Pete apply to lift the barbell, assuming he is lifting with a constant speed? (assume he is past the initial acceleration of lifting the barbell) (b) How much work does Pete do in lifting the barbell to this height? [E-S-A]
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