Discuss whether any work is being done by each of the following agents and, if s
ID: 1881027 • Letter: D
Question
Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative.
(a) a chicken scratching the ground
A chicken does work on the ground.
The ground does work on the chicken.
No work is done.
Is the work positive or negative?
The work is positive.
The work is negative.
No work is done.
(b) a person studying (holding up a book but not moving it)
The person does work on a book.
The book does work on the person.
No work is done.
Is the work positive or negative?
The work is positive
.The work is negative.
No work is done.
(c) a crane lifting a bucket of concrete
The crane does work on the bucket.
The bucket does work on the crane.
No work is done.
Is the work positive or negative?
The work is positive.
The work is negative.
No work is done.
(d) the force of gravity on the bucket in part (c)
The bucket does work on gravity.
The force of gravity does work on the bucket.
No work is done.
Is the work positive or negative?
The work is positive.
The work is negative.
No work is done.
(e) the leg muscles of a person in the act of sitting down
The leg muscles do work on the individual.
The individual does work on the leg muscles.
The individual does work on the chair
.No work is done.
Is the work positive or negative?
The work is positive.
The work is negative.
No work is done.
Explanation / Answer
Work
W= F.S
Now in scratching no displacement is there so work done is zero
A) no work is done
No work is done
B)again book is not moving
No work is done
No work is done
C) crane is doing work on bucket
As bucket is moving up and crane is also applying force upward
Work is positive
D) The force of gravity does work on bucket
Bucket moving upward and gravity is downward so work is negative
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.