Can you help me answer no. 2 and 3? 1. An 8.00 kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at53.0° below the horizontal. The coefficient of kinetic friction between the package and thechute's surface is 0.40. Calculate the work done on the package by (a) friction, (b) gravity,and (c) the normal force. (d) What is the net work done on the package?2. You throw a 20-N rock vertically into the air from ground level. You observe that when it is15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem tofind (a) the rock's speed just as it left the ground and (b) its maximum height.3. Adult cheetahs, the fastest of the great cats, have a mass of about 70 kg and have beenclocked running at up to 72 mph (32 m/s). (a) How many joules of kinetic energy does sucha swift cheetah have? (b) By what factor would its kinetic energy change if its speed weredoubled?

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Description: Can you help me answer no. 2 and 3? 1. An 8.00 kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at53.0° below the horizontal. The coefficient of kinetic friction between the package and thechute's surface is 0.40. Calcula

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and (c) the normal force. (d) What is the net v 2. You throw a 20-N rock vertically into the air f 15.0 m above the ground, it is traveling at 25.0 find (a) the rock's speed just as it left the arou

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 4P: a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the...

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a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed, (a) Find the work done by the shopper as she moves down a 50.0-m length aisle, (b) What is the net work done on the cart? Why? (c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesnt change, would the shoppers applied force be larger, smaller, or the same? What about the work done on the cart by the shopper?
A worker pushes a wheelbarrow with a horizontal force of 50 N on level ground over a distance of 5.0 m. 11 a friction force of 43 N acts on the wheelbarrow in a direction opposite that of the worker, what work is done on the wheelbarrow by the worker? (a) 250 J (b) 215 (c) 35 J (d) 10 J (e) None of those answers is correct.
A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0° below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart?
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The force acting on a panicle varies as shown in Figure la P7.14. Find the work done by the force on the particle as it moves (a) from x = 0 to x = 8.00 m. (b) from x = 8.00 m to x = 10.0 m, and (c) from x = 0 to x = 10.0 m.