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Question 1

0votes

0answers

28views

Am I correct in my understanding of how the reverse Carnot Cycle works? [duplicate]

So, when the gas (initially at the heater temperature T1) is compressed isothermally, it does not come into contact with the cooler, and in order to prevent the gas temperature from exceeding the ...

Marmajuck

39

askedNov 26 at 5:03

Question 2

1vote

2answers

159views

Why the reverse Carnot Cycle works?

I don't understand why the reverse Carnot Cycle works. Let's consider the isothermal expansion of a gas (body). The gas does work, but its temperature remains constant. For this to happen, the gas ...

Marmajuck

39

askedNov 25 at 15:05

Question 3

-3votes

0answers

48views

How much power must be supplied by the winch? [closed]

A 1380-kg block of granite is dragged up an incline at a constant speed of 1.34 m/s by a steam winch (Fig. 11-32). The coefficient of kinetic friction between the block and the incline is0.41. How ...

Nahal Ahamed

1

askedNov 24 at 19:02

Question 4

1vote

3answers

294views

Where is the increased mass reserved based on Einstein's mass-energy equation?

Assume a huge parallel-plate capacitor with plates located at an infinite distance away from each other. If we tend to move a positively charged object ($+q$) with a rest mass of $m$ against the ...

Mohammad Javanshiry

2,920

askedNov 17 at 19:14

Question 5

0votes

2answers

106views

How could one show that kinetic friction is a non-conservative force?

The question is not to talk about why kinetic friction is non-conservative, but rather if there is a way that I could show mathematically that the work done by kinetic friction is path-dependent?

Tasd 541

15

askedNov 8 at 17:23

Question 6

6votes

1answer

299views

Does the electric potential energy of a positively-charged particle vary directly with its distance from a charged particle or surface?

Current high school AP Physics II student here, so apologies if this question comes off as unlearned.I'm trying to learn about electric potential in my class, but I realize I still don't understand ...

theFavorite

63

askedNov 7 at 1:17

Question 7

-2votes

1answer

107views

Can gravity make an infinite amount of energy? [closed]

If we use gears, then we put a long metal stick then put a $100\text{ kg}$ metal object on it, assuming there are $200$ gear and each has a ratio of $1:5$, because a larger section of the double gear ...

Saheim islam

15

askedNov 4 at 10:16

Question 8

0votes

0answers

55views

Why am I getting Work done as negative in bringing a positive charge near another positive charge? [duplicate]

Let us consider a charge $Q>0$ at origin. Let $P(r,0)$ where $r>0$ be on $X$ axis.Consider a point $M(x,0),\:x>r$ from which we have to move a charge $q>0$ towards point $P$.Now I am the ...

Umesh shankar

113

askedOct 31 at 18:49

Question 9

1vote

2answers

93views

Q&A: Potential (Energy) and its Sign: inverse square law, comprehensively compiled [closed]

There have been a lot of questions (and I want to highlight a wonderful answer) on the topic of potential energy and its sign, in both the gravitational case and the electrostatic case, about the ...

naturallyInconsistent

18.3k

askedOct 28 at 2:13

Question 10

2votes

2answers

279views

Why does Callen not take into account the change in entropy of the reversible work source?

I am reading the second edition of Callen's Thermodynamics and in particular about the maximum work theorem which essentially states that a process which produces work and heat produces maximum work ...

Anna

1,253

askedOct 23 at 19:02

Question 11

0votes

7answers

566views

How can the work-energy theorem be applied in case of a block impacting a massive spring?

We have a spring with uniformly distributed mass $m$ and stiffness $k$, with free length $x_0$ aligned with the $x$-axis, lying on a friction-less table. A block of mass $M$ is moving towards it along ...

Ján Lalinský

47.4k

askedOct 17 at 18:54

Question 12

0votes

5answers

181views

Ambiguity in work-energy theorem for a system

in this question if I have to find max compression in spring then if I consider both block and spring as system and then apply work energy theorem then as I have written above that spring force is ...

Blender Learner

3

askedOct 17 at 7:32

Question 13

-6votes

3answers

165views

Why is it watt second instead of watt per second? [closed]

We say 1 meter per second to express 1 meter covered in 1 second. Why can't we say 1 watt per second when 1 watt is used in 1 sec?

Ahmed Abrar

3

askedOct 10 at 10:43

Question 14

10votes

10answers

1kviews

What does it mean for work to be done ON a system?

I have been reading different literature on thermodynamics for a course at university, and of course, the idea of work being done ON a system is very central. What is rather seldom explained, perhaps ...

Anna

1,253

askedSep 24 at 19:54

Question 15

2votes

1answer

226views

Geometric mean used to calculate gravitational work $L_{AB}=U(A)-U(B)$

We know that$$\mathbf{F}^{G}(r) = -\frac{GMm}{r^2} \, \mathbf{\hat{r}}$$where $\mathbf{\hat{r}}$ is the unit vector in the radial direction.I want to calculate the work $L_{AB}$ done by this ...

Sebastiano

2,907

askedSep 21 at 21:22

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Stack Exchange Network

Questions tagged [work]

Am I correct in my understanding of how the reverse Carnot Cycle works? [duplicate]

Why the reverse Carnot Cycle works?

How much power must be supplied by the winch? [closed]

Where is the increased mass reserved based on Einstein's mass-energy equation?

How could one show that kinetic friction is a non-conservative force?

Does the electric potential energy of a positively-charged particle vary directly with its distance from a charged particle or surface?

Can gravity make an infinite amount of energy? [closed]

Why am I getting Work done as negative in bringing a positive charge near another positive charge? [duplicate]

Q&A: Potential (Energy) and its Sign: inverse square law, comprehensively compiled [closed]

Why does Callen not take into account the change in entropy of the reversible work source?

How can the work-energy theorem be applied in case of a block impacting a massive spring?

Ambiguity in work-energy theorem for a system

Why is it watt second instead of watt per second? [closed]

What does it mean for work to be done ON a system?

Geometric mean used to calculate gravitational work $L_{AB}=U(A)-U(B)$

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