Question: Justin moves a desk 5.0 m across a level floor by pushing on it with a constant horizontal force of 340 N. (It slides for

Justin moves a desk 5.0 m across a level floor by pushing on it with a constant horizontal force of 340 N. (It slides for a negligibly small distance before coming to a stop when the force is removed.) Then, changing his mind, he moves it back to its starting point, again by pushing with a constant force of 340 N.
(a) What is the change in the desk's gravitational potential energy during the round-trip? (b) How much work has Justin done on the desk?
(c) If the work done by Justin is not equal to the change in gravitational potential energy of the desk, then where has the energy gone?

Step by Step Solution

★★★★★

3.34 Rating (166 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a Strategy and Solution Since the floor is level th... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

956-P-M-L-M (1018).docx

120 KBs Word File

Students Have Also Explored These Related Mechanics Questions!

A box with mass m is dragged across a level floor having a coefficient of kinetic friction k by a rope that is pulled upward at an angle (J above the horizontal with a force of magnitude F. (a) In...

A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350N. For the first 15m the floor is frictionless, and for the next 15m the coefficient of friction is...

A 36.0-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 225 N. For the first 11.0 m the floor is frictionless, and for the next 10.0 m the coefficient of...

A curve in a stretch of highway has radius 489m. The road is unbanked. The coefficient of static friction between the tires and road is 0.700. Draw the correct free-body diagram of the carwhen it...

Justin moves a desk 5 . 0 0 m across a level floor by pushing on it with a constant horizontal force of 5 7 4 N . ( It slides for a negligibly small distance before coming to a stop when the force is...

A major leaguer hits a baseball so that it leaves the bat at a speed of 32.0 m/s and at an angle of 36.9 above the horizontal. You can ignore air resistance. You may want to review (Page) . For help...

Note: To simplify calculations, you may use g = 10 m/s in all problems.V =7.5 m/s Questions 2-4 refer to the following figure: B C - NWAVAN D velocity (m/s) 1. An object is thrown horizontally to the...

PY H3: 1) When you apply a horizontal force of 44 N to a block, the block moves across the floor at a constant speed (,uk = #5). (a) What happens if instead you apply a force of 35 N to the block...

watch the three short clips below then answer the questions Copy and paste the three links below 1) Projectile Motion https://www.nsf.govews/mmg/mmg_disp.jsp?med_id=72205&from= 2) Newton's Second Law...

Can you please help me with these college physics questions. The questions are in the screenshots and dow below: 1. A 0.400-kg object is attached to a spring with spring constant k = 10.0 N/m and...

a) What would the value of the test statistic be? Round to three decimal places. b) What would be the critical value if ?=3%? Round to three decimal places. c) What would be the conclusion in...

The cost of the advertising in trade magazines would most likely be : a . Product, Direct Material b . Product, Direct Labor c . Product, Overhead d . Period e . None of the above

What is the difference between normative analysis and positive analysis? Is economics concerned primarily with normative analysis or with positive analysis? Problems and Applications

A yo-yo has a rotational inertia of 950 g cm2 and a mass of 120 g. Its axle radius is 3.2 mm, and its string is 120 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the...

In 1980, over San Francisco Bay, a large yo-yo was released from a crane. The 116 kg yo-yo consisted of two uniform disks of radius 32 cm connected by an axle of radius 3.2 cm. What was the magnitude...

In unit-vector notation, what is the torque about the torque about the origin on a particle located at coordinate (0, -4.0m 3.0m) if that torque is due to (a) Force F1 with components F 1x = 2.0 N,...

Fama's Llamas has a weighted average cost of capital of 11 percent. The company's cost of equity is 16 percent, and its pretax cost of debt is 7.5 percent. The tax rate is 34 percent. What is the...

Consider the following portfolio: a newly entered - into long forward contract on an asset and a long position in a European put option on the asset with the same maturity as the forward contract and...

John will reitre next month and has $ 6 5 0 , 0 0 0 in Registered Retirement Savings Plan ( RRSP ' s ) . He wants a monthly payment at the beginning of each month and expects to earn 7 % , compounded...