Advertisements
Advertisements
प्रश्न
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
Advertisements
उत्तर
Electrical energy (electric current) → light energy + Heat energy (bulb).
APPEARS IN
संबंधित प्रश्न
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
What do you mean by degradation of energy?
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
List any six forms of energy and write a short note on each of them.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
