Q.26) Differentiate between energy and power.
Q.27) State and define the SI unit of power.
Q.28) (a) Name the physical quantity measured in terms of horsepower.
(b) How is horse power related to the SI unit of power ?
Q.29) Differentiate between watt and watt hour.
Q.30) Name the quantity which is measred in (a) kWh (b) kW (c) Wh (d) eV
Q.21) Name the physical quantity which is measured in calorie. How is it related to the SI unit of that quantity?
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Q.22) Define kilowatt hour. How is it related to joule?
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Q.23) Define the term power. State its SI unit.
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Q.24) State two factors on which power spent by a source depends. Explain your answer with example.
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Q.25) Differentiate between work and power.
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Q.16) A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.
Q.17) A body of mass m climbs up the stairs of vertical height h.
(a) What is the work done by the body against the force of gravity ?
(b) What would have been the work done if he uses a life in climbing the same vertical height?
Q.18) Define the term energy and state its SI unit.
Q.19) What physical quantity does the electron volt (eV) measure? How is it related to the SI unit of that quantity?
Q.20) Complete the following sentences :
(a) 1 J = __________ calories.
(b) 1 kWh = __________ J
Ans : (a) 0.24 (b) 3.6 X 10^16
13) What are SI and CGS units of work ? How are they related? Establish the relationship.
14) State and define the SI unit of work.
15) Express Joule in terms of erg.
7) When a body moves in a circular path, How much work in done by the body? Give Reason.
8) A Satellite revolves around the earth in a circular orbit. What is the work done by the satellite ? Give reason.
9) State whether work is done or not by writing yes or no, in the following cases ?
(a) A man pushes a wall.
(b) A coolie stands with a box on his head for 15 min.
(c) A boy climbs up 20 stairs.
10) A Coolie X carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head moves the same distance on a frictionless horizontal platform. Who does more work ? Explain the reason.
EXERCISE 2(A)
Q.1) Define work. When work is said to be done by a force ?
Q.2) How is the work done by a force measured when (i) force is in direction of displacement (ii) force is at an angle to the direction of displacement ?
Q.3) A force F acts on a body and displaces it by a distance S in a direction at an angle thita with the direction of force. (a) write the expression for the work done by the force. (b) what should be the angle between the force and displacement to get (i) zero, (ii) maximum, work ?
Q.4) A body is acted upon by a force. State two conditions when the work done is zero.
Q.5) State the condition when the work done by a force is (a) positive (b) negative. Explain with the help of examples.