Potential energy = (weight) x (height)
After the car has been raised 2.5 meters, it has
(11,000) x (2.5) = 27,500 Joules
MORE potential energy than it had before it was lifted.
That's the energy that has to come from the work you do to lift it.
Since no mechanical process is ever 100% efficient, the work required
to accomplish this task is <em>at least 27,500 joules</em>.
Answer:
Explanation:
Given:
- cross sectional area of the wire,
- density of aluminium wire,
- young's modulus of the material,
- wave speed,
<u>We have mathematical expression for strain as:</u>
...............................(1)
and since, 
where, T = tension force in the wire
equation (1) becomes:
............................(2)
<u>Also velocity ofwave in tensed wire:</u>
...................................(3)
where: 
linear mass density of the wire
Now, equation (3) becomes
............................(4)
Using eq. (2) & (4) for tension T
putting the respective values
The potential difference between the two points if the work done on the charge is +3.4×10^7 joules would be A. 10volts.
It will be hotter and more like than 20celium degrees
