Physics
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
(a) Compare:
(i) the work, and (ii) power developed by them.
(b) How much work each does?
Take density of water = 103kg m -3 and g = 9.8 N kg-1
Related Questions
A boy of weighing 40 kgf climbs up a stair of 30 steps, each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes.
Compare :
(i) the work done by them, and
(ii) the power developed by them. Take g = 10 N kg-1.
A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s.
(a) Compare: (i) the work done, (ii) the power developed by them.
(b) Calculate the (i) the work done, (ii) the power developed by each man.
Take g = 10N kg-1.
A body at a height possesses:
- Kinetic energy
- Potential energy
- Solar energy
- Heat energy
The energy possessed by a body due to the force of attraction of earth on it is called its:
- Rotational kinetic energy
- Kinetic energy
- Gravitational potential energy
- Elastic potential energy