Advertisements
Advertisements
प्रश्न
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
Advertisements
उत्तर
Given, force = 1000 N, velocity = 30 m/s-1
Power, P = Force × Velocity
P = 1000 × 30 = 30,000 W = 30 kW
APPEARS IN
संबंधित प्रश्न
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
State and define the S.I. unit of work.
Name the quality which is measured in kWh.
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
State the condition when the work done by a force is negative. Explain with the help of examples.
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. Compare:
- the work, and
- power developed by them.
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.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
State two conditions for work to be done.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
