**28. As the engine in a car forces its wheels to turn, static friction between the road and the wheels of a car produces a force of 1000 N acting forward on the car to keep it going at a constant speed of 25 m/s. a) How much work does the static friction force do to the car as the car travels along the road for 10 seconds? b) At what rate in watts is the power being supplied? c) A horsepower is a U.S. unit of power, equal to 746 watts. Convert the power from part (b) into horsepower

**28. As the engine in a car forces its wheels to turn, static friction between the road and the wheels of a car produces a force of 1000 N acting forward on the car to keep it going at a constant speed of 25 m/s. a) How much work does the static friction force do to the car as the car travels along the road for 10 seconds? b) At what rate in watts is the power being supplied? c) A horsepower is a U.S. unit of power, equal to 746 watts. Convert the power from part (b) into horsepower

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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Time left 1:10:32 A box weighs 49 N is pulled 6.0 m up along a 37° inclined plane. What is the work done by the weight (gravitational force) of the box? W 37° Select one: O A. -1.77 x 102 J O B. -1.1 x 10² J OC. -0.2 J O D. -11 J OE. -1.4 x 102 J
2. An ocean diver swims upwards against the drag force exerted by the water. This force varies in magnitude by depth (d) and is given by F(d)=√d, where y=100 N/m ¹/2. If the diver ascends from a depth of d=10m to the surface (d=0), what is the work done by this drag force? Why is this work negative?
II. Instruction:Solve the following problems. Present in writing the full details of your answer or solutions. 1. What is the change in gravitational potential energy for a 70 kg man walking up stairs from a height of 64 m to 108 m? a. - 30215 J b. 30215 J 2. A 1500 kg car accelerates from o to 25 m/s in 8 s. What is the average power delivered by the engine (1 hp = 746 watts)? a. 68.5 hp b. 88.5 hp 3. A hammerhead of mass m = 4 kg is allowed to fall onto a nail from a height h = 0. 5 m. determine the maximum amount of work it could c. -30130 J d. 30130J с. 78.5 hp d. 98.5 hp do on the nail. a. 19.62 J b. 18.62 J с. 17.62 J d. 16.62 J
Dr. B is bouncing a 0.245 kg playground ball in his office one day. He drops the ball from a height of 1.2 m, but the ball only bounces up to 70% its initial height. How much work does the floor do on the ball? a. -1.04 J b. -0.86 J c. -0.69 J d. -0.43 J e. -1.21 J
A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules? b. What is the work done by friction, in joules? c. What is the work done by gravity, in joules? d. What is the net work, in joules?
A 3-kg block has a speed of v=9 m/s at point O as it travels along a rough incline OA with μk=0.25. It then hits a spring with k=500 N/m at point A and eventually comes to a temporary stop as it reaches its highest point. Let x be the deformation of the spring when the block reaches a temporary stop.Which of the forces acting on the block does NOT do work?a. force exerted by springb. normal forcec. frictional forced. weight of the block
A force, in an angle of 32º, is applied to a 28-kg object which caused it to accelerate at 12 m/s2. It moved at a distance of 34 m, horizontally. How much work is done by the force? a. 9688.10 J b. 0 J c. 6053.80 J d. 4528.57 J
a.) A student is riding a bicycle at a constant speed of 6.0 m/s on a level road. The mass of the student and bicycle together is 80 kg. Assume the friction and drag is 35 N. What is the student's output power, in Watts? b.) A student is riding a bicycle at a constant speed of 6.0 m/s on a 7.0º hill. The mass of the student and bicycle together is 80 kg. Assume the friction and drag is 35 N. What is the student's output power, in Watts?
A 700 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower of the car engine?a) watts= b) horsepower=
Before railroads were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting a 1200 N force for 10 km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mule do on the barge? a. 12 MJ b. 11 MJ c. 4.1 MJ d. 6 MJ
Problem1. A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B, as shown. Points A and B are 1.5 m apart. (a) How much work is done on the block by the force P? (b) If the kinetic energies of the block at A and B are 6.0 J and 4.0 J, respectively, how much work is done on the block by the net force as the block moves from A to B? (c) What is the work done by the friction force? 40° B
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