Question

Work done by a system is taken to be a) positive b) negative c) zero d)...

Work done by a system is taken to be
a) positive
b) negative
c) zero
d) varies according to situation

Homework Answers

Answer #1

If you use the notation of 1st law as follows:

Q - W = dE

then,

if system is expanded ( i.e. system DOES work on the surroundings) then, W must be positive

b)

If we use the notation

Q + W = dE

then,

the System is losing energy, due to the expansion, so we must account this as NEGATIVE.

Therefore, vaeries according the situation

Typically, modern thermodynamics courses use the first notation

Q - W = dE

then, the Work done must be accounted possitive

choose A

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
the sign (negative or positive)of work being done on the system or on the surroundings
the sign (negative or positive)of work being done on the system or on the surroundings
In an interference force fit in a basic hole system, the allowance is: (a) zero (b)negative...
In an interference force fit in a basic hole system, the allowance is: (a) zero (b)negative (c)positive (d)greater than the tolerance of either the hole of the shaft (e)equal to the nominal or basic dimension
Complete each of the statements below. When work is done on a system by its surroundings,...
Complete each of the statements below. When work is done on a system by its surroundings, the sign of w is                           [ Select ]                       ["positive", "negative"]         . When work is done by a system on its surroundings, the sign of w is                           [ Select ]                       ["negative", "positive"]   ...
When a ball move upward, it the work done by gravity positive or negative? What about...
When a ball move upward, it the work done by gravity positive or negative? What about when the ball reaches its the peak, and begin moving downward, what is the work done by gravity?
When marginal profit is zero, Average profit: a) equals marginal profit. b) is positive. c) is...
When marginal profit is zero, Average profit: a) equals marginal profit. b) is positive. c) is zero. d) can be positive, negative, or zero.
In long run equilibrium, monopolistically competitive firms experience ______ economic profits. A positive B zero C...
In long run equilibrium, monopolistically competitive firms experience ______ economic profits. A positive B zero C negative D can not be determined
when the work done by a force is negative this means that:
when the work done by a force is negative this means that:
For each of the following examples, tell me whether you the work done by the indicated...
For each of the following examples, tell me whether you the work done by the indicated force to be always negative, always positive, always zero or to vary over the course of the indicated time. In each case, please justify your answers. a. The tension in Spider-Man's webline as he swings from the top of a building to the ground. b. The force of air resistance as Spider-Man swings from the top of a building to the ground. c. The...
List four chemical and/or structural differences that distinguish gram-positive from gram-negative bacteria. a. b. c. d.
List four chemical and/or structural differences that distinguish gram-positive from gram-negative bacteria. a. b. c. d.
If a firm is making a normal profit, economic profits are: a. zero. b. positive. c....
If a firm is making a normal profit, economic profits are: a. zero. b. positive. c. negative. d. increasing fast In Romer’s influential paper he divided the economic world into: a. resources and ideas. b. objects and resources. c. objects and ideas. d. utilities and objects. e. None of these answers is correct. In economics, a rival good is one that: a. cannot be consumed by more than two people at a time. b. can be consumed by more than...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT