Question

A person pushes a wall and believes that he is doing a work, while another person...

A person pushes a wall and believes that he is doing a work, while another person believes that this person did not work. Which belief is true?

Homework Answers

Answer #1

In physics work is defined as force applied on an object times the displacement of the object, caused by the applied force. In the case of a person pushing the wall, the person applies a force on the wall but the wall undergoes no displacement. Hence the work done by the person is zero.

Another way to look at this situation is through work-energy theorem. This theorem tells us that work done on a system equals the change in kinetic energy of the system. As the wall does not move so the change in it's kinetic energy is zero. Hence the work done on the wall is zero.

So the other person is correct.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. When a person pushes hard on a solid wall, is work done? 2. Why is...
1. When a person pushes hard on a solid wall, is work done? 2. Why is it tiring to push hard against a solid wall?
A 65-kgkg ice skater stands facing a wall with his arms bent and then pushes away...
A 65-kgkg ice skater stands facing a wall with his arms bent and then pushes away from the wall by straightening his arms. At the instant at which his fingers lose contact with the wall, his center of mass has moved 0.55 mm , and at this instant he is traveling at 4.0 m/sm/s .\ 1). What is the average force exerted by the wall on him? 2). What is the work done by the wall on him?\ 3). What...
A person pushes a 400.0 kg couch 10.5 m up a 15.0 ̊ incline at a...
A person pushes a 400.0 kg couch 10.5 m up a 15.0 ̊ incline at a constant velocity. The person pushes the couch against friction, which has a kinetic friction coefficient of 0.40. A. What is the is the force exerted by the person? B. What is the work done on the couch by the person? C. What is the work done on the couch by the force of gravity? D. What is the work done on the couch by...
one person said that isotonic solutions have concentration of .28 M while another says that the...
one person said that isotonic solutions have concentration of .28 M while another says that the concentration of NaCl in an isotonic solution is .14M. How can this be true?
1. A psychologist believes that 80% of male drivers, when lost, continue to drive, hoping to...
1. A psychologist believes that 80% of male drivers, when lost, continue to drive, hoping to find the location they seek rather than ask directions. To examine this belief, he took a random sample of 360 male drivers and asked each what they did when lost. If the belief is true, what is the probability that less than 75% said they continue driving? 2. Refer to question 1. For a sample of 320 male drivers, what is the interquartile range...
Erik believes that his pay was not equitable to the work that he put in when...
Erik believes that his pay was not equitable to the work that he put in when compared to others. This situation can be considered a matter of __________. Select one: a. distributive justice b. interactional justice c. informational justice d. procedural justice
QUESTION 32 A deliberate misrepresentation of a material fact with intent to induce another person to...
QUESTION 32 A deliberate misrepresentation of a material fact with intent to induce another person to enter into a contract -- and on which the person reasonably relies and does enter into a contract that is injurious to that person -- is defined in the legal community as: (A) Fraud. (B) Duress. (C) Materiality. (D)  Puffery. QUESTION 33 The law enforces all promises, therefore, all promises are contracts. True or False QUESTION 34 A civil wrong not arising from a breach...
You work for a multinational company with multiple business segments. Your manager explains that he believes...
You work for a multinational company with multiple business segments. Your manager explains that he believes fixed overhead should just be included in product costs. With examples from the lesson readings or your own life, explain to your manager why you agree or disagree with him.
While driving Max was rear-ended by another vehicle, slammed his head into the steering wheel, and...
While driving Max was rear-ended by another vehicle, slammed his head into the steering wheel, and was knocked unconscious. When the paramedics finally woke him up, he could only see out of his right eye and could not see out of his left eye. What cranial nerve did Max most likely damage? Is this nerve primarily a sensory or motor nerve? And what is the primary function of this nerve?
Please answer the multiple choice question. Only choose one answer choice. Then write an IRAC answer...
Please answer the multiple choice question. Only choose one answer choice. Then write an IRAC answer about the issue that is being tested. While drinking in a bar, Mauricio got angry at another patron's insults and tried to punch him. The man ducked, however, and Mauricio accidentally punched a woman standing behind him, breaking her nose. Mauricio is charged with battery, which requires an "intentional act to injure another through physical contact." Will he be found guilty?  Yes, because even...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT