Advertisements
Advertisements
प्रश्न
Name five appliances or machines which use an electric motor.
उत्तर
Five appliances that use electric motor are:
(i) Electric fans
(ii) Washing machines
(iii) Refrigerators
(iv) Mixer and grinder
(v) Hair dryer
APPEARS IN
संबंधित प्रश्न
State two conditions when no work is done by a force.
State two factors on which the work done on a body depends.
What are the quantities on which the amount of work done depends? How are they related to work?
Explain by an example that a body may possess energy even when it is not in motion.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
Give two examples of couple action in our daily life.
Give two examples of work done.
Name the physical quantity whose MKS units are kgm2s-3.
A body does 20 J of work in 10 s. What is its power?
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
State the energy changes which take place when A toy car with a wound spring moves on ground.
What is the difference between renewable and non-renewable resources?
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
Who is the odd one out?
Force acting on a particle moving in a straight line varies with the velocity of the particle v as F = `K/v`, where K is a constant. The work done by this force in time t is
