Advertisements
Advertisements
प्रश्न
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
Advertisements
उत्तर
When a coolie carries a load while moving on a ground, the displacement is in the horizontal direction while the force of gravity acts vertically downward. So the work done by the force of gravity is zero.
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?
How is work done by a force measured when the force is in the direction of displacement?
Draw a simplified diagram of a lemon crusher, indicting of load and effort
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
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.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
Give the units of couple.
State two conditions for work to be done.
