Question

Please help with this question..

Answer 1

http://screencast.com/t/wY3DZs6F

Answer 2

@mathslover @Callisto @Preetha

Answer 3

1. conservation of energy
2. When something fall from height h (h>0) to the reference level (0), it loses G.P.E. and gain K.E.
Not quite sure if it is useful in this question.

Answer 4

but the correct answer is B, thats why i was wondering

Answer 5

My bad :( I don't know much about elastic potential energy...
@experimentX Can you give a hand here when you're online?

Answer 6

The correct answer is C.
Water is stored in a dam at a considerable height creating gravitational potential energy. A quantity is allowed gravity flow to create kinetic energy. This kinetic energy is converted to rotational energy of an electric generator by proper coupling. Finally, the rotational energy is converted into electrical energy

Answer 7

An elastic object is said to possess an elastic potential energy when the object is subjected to a tension or compression by an external force. Springs are the most common example of elastic potential energy. I suppose that the water in the dam undergoes compression when it is forced into the turbines, so the first phase of conversion of the gravitational potential energy could be considered to be elastic potential energy.

Answer 8

Yeah it is C)

Answer 9

From X to Y it is losing the gravitational potential energy and gaining the "kinetic energy"

Answer 10

the height decreases from X to Y so mgh decreases from X to Y i.e. gravitational P.E ...

Answer 11

B can be justified as a correct answer based on initial compression of the water giving the water elastic potential energy. This elastic potential energy is then converted into kinetic energy of the water.

Answer 12

oh thanks :)

Answer 13

You're welcome :)