Advertisements
Advertisements
प्रश्न
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
उत्तर
APPEARS IN
संबंधित प्रश्न
Name a common device where a gear train is used
Derive a relationship between S.I. and C.C.S. unit of work
Work is said to be done by a forte only when ................
The energy of a body is its capacity to do .........
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
What is meant by a translational motion? Give one example.
Write an expression for the work done against gravity.
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
List any six forms of energy and write a short note on each of them.
Give an example
Light energy changes to electrical energy.
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
