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## Previous Year Papers

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Class 10 Class 12

A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude Po. The instantaneous velocity of this car is proportional to

• t2Po

• t1/2

• t-1/2

B.

t1/2

Power Po = Fv

Power Po = Fv

874 Views

Define watt.

Power is said to be one watt if one joule of work is done in one second.
860 Views

What are different units of energy?

The different units of energy are :

(i) Joule
(ii) Erg
(iii) eV
(iv) KWh
(v) Calorie.

804 Views

Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.
1450 Views

What is watt?

SI unit of power is Watt.
773 Views

Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
799 Views