Home
Class 9
PHYSICS
A women does 250 J of work in 10 seconds...

A women does 250 J of work in 10 seconds and a boy does 100 J of work in 4 seconds. Who delivers more power ?

Text Solution

Verified by Experts

Power, P = W/t
Power delivered by woman = 250/10 = 25W
Power delivered by boy = 100/4 = 25 W
Both woman and boy deliver same power. That is rate of doing the work by woman and boy are equal.
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    NCERT GUJARATI|Exercise Let us Improve our learning (Reflections on concepts)|5 Videos
  • WORK AND ENERGY

    NCERT GUJARATI|Exercise Let us Improve our learning (Application of concepts)|6 Videos
  • SOUND

    NCERT GUJARATI|Exercise Let us Improve our learning (Multiple choice questions)|5 Videos

Similar Questions

Explore conceptually related problems

A person performs 420 J of work in 5 minutes. Calculate the power delivered by him.

Two moles of an ideal monoatomic gas are confined within a cylinder by a massless and frictionless spring loaded piston of cross-sectional area 4 xx 10^(-3)m^(2) . The spring is, initially in its relaxed state. Now the gas is heated by an electric heater, placed inside the cylinder, for some time. During this time, the gas expands and does 50J of work in moving the piston through a distance 0.10m . The temperature of the gas increases by 50K . Calculate the heat supplied by the heater. P_(atm) = 1 xx 10^(5)N//m^(2)R = 8.314 J//mol-K

The position (x) of body moving along x-axis at time (t) is given by x=3t^(2) where x is in matre and t is in second. If mass of body is 2 kg, then find the instantaneous power delivered to body by force acting on it at t=4 s.

A system absorbs 2 Kcals heat and does 500 J of work, then internal energy of the system will be …….

A steam engine delivers 5.4 xx 10^8 J of work per minute and services 3.6 xx 10^9 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute ?

A man carrying a bag of total mass 25 kg climbs up to a height of 10 m in 50 seconds. Calculate the power delivered by him on the bag. (AS_(1))

150 workers were engaged to finish a piece of work in a certain number of days. Four workers dropped from the work on the second day. Four workers dropped on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed. [Let the no.of days to finish the work is 'r' then 150 x = (x+8)/2 [2 xx 150 + (x+8-1)(-4)]

A point mass of 0.5 kg is moving along x- axis as x=t^(2)+2t , where, x is in meters and t is in seconds. Find the work done (in J) by all the forces acting on the body during the time interval [0,2s] .

A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows : Rs 200 for the first day . Rs 250 for the second day , Rs 300 for the third day , etc. the penalty for each succeeding day being Rs50 more than for the preceding day. How much money the contractor has to pay as penalty , if the has delayed the work by 30 days?

A diatomic gas (gamma=1.4) does 2000J of work when it is expanded isobarically. Find the heat given to the gas in the above process (in kJ).