Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Work Energy and Power question

2013 · Q150
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Work Energy and Power
  5. /2013 · Q150

Work Energy and Power question

2013 · Q150

NEETPhysicsWork Energy and PowerMCQ+4 / −1
One coolie takes 1 minute to raise a suitcase through a height of 2 m but the second coolie takes 30 s to raise the same suitcase to the same height. The powers of two coolies are in the ratio
  1. A
    1 : 3
  2. B
    2 : 1
  3. C
    3 : 1
  4. D
    1 : 2
View written solutionFree

Correct answer: D

Power, (p)=Work doneTime taken\left( p \right) = {{Work\,done} \over {Time\,taken}}(p)=TimetakenWorkdone​

Here work done (= mgh) is same in both cases.

∴P1P2=t2t1=30 s1 min⁡=30 s60 s=12 \therefore {{{P_1}} \over {{P_2}}} = {{{t_2}} \over {{t_1}}} = {{30\,s} \over {1\,\min }} = {{30\,s} \over {60\,s}} = {1 \over 2}∴P2​P1​​=t1​t2​​=1min30s​=60s30s​=21​

PreviousNext

More from Work Energy and Power

  • A uniform force of (3i+j​) newton acts on a particle of mass 2 kg. Hence the particle is displaced from position (2i+k) metre to position (4i+3j​−k)…2013 · MCQ
  • A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude P0. The instantaneous velocity of this car is proportional to2012 · MCQ
  • A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m s−1. It collides with a horizontal spring of force constant 200 N m−1. The maximum compression produced in the spring will be2012 · MCQ
  • The potential energy of a particle in a force field is U=r2A​−rB​ where A and B are positive constants and r is the distance of particle from the centre of the field. For stable equilibrium, the distance of the…2012 · MCQ
  • A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to a mass of 3m moving vertically upwards (along the y-axis) with velocity 2v. The final velocity of the combination is2011 · MCQ
  • The potential energy of a system increases if work is done2011 · MCQ
  • Force F on a particle moving in a straight line varies with distance d as shown in figure. The work done on the particle during its displacement of 12 m is Includes diagram2011 · MCQ
  • A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest2011 · MCQ