Advertisements
Advertisements
प्रश्न
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
Advertisements
उत्तर
Resisting force = 75 N; Distance moved = 30 m
∴ Work done = 75 × 30 J = 2250 J.
संबंधित प्रश्न
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 of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
State the condition when the work done by the force is positive
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
Justify the statement. “Power can be expressed as the product of force and velocity.”
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
