Question

1. Find out the kinetic energy of an electron moving with a speed of 1.2 x 10" m/s. Mass of electro
2. Find out the work done by a machine in lifting a mass of 40 kg to a height of 10 m. (g = 9.8 m/
3. A body of mass 6 kg falls down from a height of 5 m. Calculate the change in potential energy
A spring has a constant 4 x 10° N/m. How much work has to be done to compress it by 0.04 m
5. 0.4 J work is done in a spring for streching at distance of 0.02 m, then find out the spring con
hanical energy remains cons
E Numerical Problems..
(Ans. 6.55 x 10
9.1 x 10-31 kg.
[Ans. 3.9
(g = 10
body.
(Ans.
[Ans. 2 x 10
6. Find out the power of an engine if it lifts a load of 200 kg to a height of 50 m in 10 sec.
(g = 10 m/s2)
[Ans.
7. In a house, five appliances are used for 10 hours daily. If two appliances are of 200 W ea
three appliances are of 400 W each, then calculate the electrical energy consumed b
appliances in one day.
[Ans. 1
A force is applied on a mass of 40 kg to increase its velocity from 2 m/s to 5 m/s. Find out t
done by the force.
[An:​

Answer 1

Answer:

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