Advertisements
Advertisements
प्रश्न
Write an expression for the work done against gravity.
उत्तर
Work done against gravity = mass x acceleration due to gravity x height
Or, W = mgh
APPEARS IN
संबंधित प्रश्न
When do we say that work is done?
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
Derive a relationship between S.I. and C.C.S. unit of work
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
State two advantage of producing hydroelectricity.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
What is the work done when the object acted upon by a force remains at rest?
What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.
Fill in the boxe to show the corresponding energy transformation.
Give an example
Chemical energy changes to electrical energy.
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
A ______ should act on an object.
