All Questions
7
questions
0
votes
1
answer
265
views
Finding energy of a rubber band
I'm solving a thermodynamics exercise and at one point I'm asked to find the energy if a rubber band. The rubber band has temperaturte $T$ lenght $L$ and tension $J$. I'm given the following ...
- 185
0
votes
1
answer
128
views
Why have we assume that the there should be no acceleration in deriving the Electrostatic potential energy
In the NCERT textbook grade 12, it is mentioned before deriving the work done in moving a charge $q$ from point $R$ to $P$ in presence of an electric field at Origin, $O$ by charge $Q$
Two remarks ...
- 753
1
vote
0
answers
93
views
Can kinetic and potential energy be converted to thermal energy? [closed]
If they can, can I use the potential energy equation to find out how much the temperature would increase if 1 kg of water is dropped to the ground from 10m height?
- 23
1
vote
3
answers
136
views
Velocity not affecting heat produced by impact
A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 $\text{m s}^{–1}$. It hits the floor of the elevator (length of the elevator = 3 m) and does not ...
- 147
0
votes
1
answer
67
views
Why is this height used for potential energy?
"In a hydro-electric scheme the catchment area is 57 km2 and the annual rainfall for the area is 1720 mm. The
reservoir for the scheme is 380 m above sea level, and the power station is 50 m above sea ...
user193025
1
vote
4
answers
98
views
Faced a contradiction while calculating the work done by an outside agent from two different ways
I solved this problem in two ways.
Since $dV$ and $dy$ are given, we sum the work done on the hydro-static system and the change in the potential energy of the spring.
$$\delta W=-PdV+\frac12 k ...
- 912
0
votes
2
answers
70
views
Calorimetry problem [closed]
The second picture shows the textbook solution which I don't find convincing and the third picture shows my work.
I don't understand why will the block fall 40 cm toward the bottom of the vessel as ...
- 646