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Byju's Answer

Standard XIII

Physics

Units of Power

Two coolies A...

Question

Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is

nothing can be said.

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same by both coolies

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is less by coolie A than by B

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is more by coolie A than by B

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Solution

The correct option is D is more by coolie A than by B
Power consumed while doing any work is inversely proportional to the time taken to do that work.
Power = Work done/time taken

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Similar questions

(a) The S.I. unit of work is

(i) second (ii) metre

(iii) joule (iv) Newton.

(b) No work is done by a force if the body

(i) moves in direction of the force

(ii) does not move

(iii) moves in the opposite direction

(iv) none of these

(i) same by both coolies

(ii) is more by coolie A than by B

(iii) is less by coolie A than by B

(iv) nothing can be said

(d) The expression of power P is

(i) P = mgh (ii) P = $\frac{1}{2} m v^{2}$

(iii) P = $F \times d$ (iv) P = $F \times \frac{d}{t}$

(e) 1 H.P. is equal to

(i) 1 W (ii) 1 J

(iii) 764 J (iv) 746 W

(f) When a boy doubles his speed, his kinetic energy becomes

(i) half (ii) double

(iii) four times (iv) no change

(g) A boy lifts a luggage from height 2 m to 4m. The potential energy will become

(i) half (ii) double

(iii) one- third (iv) one - fourth

A boy weighing 350 N climbs up the 30 steps, each 20 cm high in 1 minute. Calculate:(i) the work is done, and (ii) the power spent.

Q. 01

Q. One coolie takes 1 minute to rdise a suitcase through a height of 2m but the second coolie takes 30 sec to rdise the same suitcase to same height. The powers of two coolies in the ratio

(a) 1 : 3 (b) 2 : 1 (c) 3 : 1 (d) 1 : 2

Q. Rahul takes 1 minute to raise a box to a height of 1 metre and Rohan takes

\frac{1}{2}

minute to do so. Comment on the energy spent by the two.

Q. Coolie

A

takes 1

minute

to raise a box through a height of

2 m

. Another coolie

B

takes

30 sec

for the same job and does the same amount of work. Choose the correct option.

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Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is

The correct option is D is more by coolie A than by BPower consumed while doing any work is inversely proportional to the time taken to do that work. Power = Work done/time taken

The correct option is D is more by coolie A than by B
Power consumed while doing any work is inversely proportional to the time taken to do that work.
Power = Work done/time taken