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Class 10 Class 12

Two similar springs P and Q have spring constants KP and KQ, such that KP>KQ. They are stretched, first by the same amount (case a), then by the same force (case b). The work done by the springs WP and WQ are related as, in  case (a) and case (b), respectively

• WP =WQ ;WP> WQ

• WP =WQ ;WP= WQ

• WP > WQ ;WQ> WP

• WP <WQ ; WP< WQ

C.

WP > WQ ;WQ> WP

Given KP>KQ
In case (a) the elongation is same

Given KP>KQ
In case (a) the elongation is same

2555 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 are different units of energy?

The different units of energy are :

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

804 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

Define watt.

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

What is watt?

SI unit of power is Watt.
773 Views