Advertisements
Advertisements
Question
Solution
If 1 joule of work is done in 1 second, the power is said to be 1 watt.
1 H.P. = 746 watt
APPEARS IN
RELATED QUESTIONS
Why is a jack screw provided with a long arm?
An electron emitter must have _____________ work function and ___________ melting point.
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Express joule in terms of erg.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
State the energy transformation on the following:
Electricity is obtained from solar energy.
What do you mean by degradation of energy?
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.
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Why does a spanner have a long handle?
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
How many joules are there in 1 mega joule?
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
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.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
