Advertisements
Advertisements
Question
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
Advertisements
Solution
Mass of box = 20 kg
t = 5 minutes
Energy gained = force applied = 0
∵ Zero work is done, as there is no displacement of the man.
APPEARS IN
RELATED QUESTIONS
An electron emitter must have _____________ work function and ___________ melting point.
How is work related to energy?
What are the quantities on which the amount of work done depends? How are they related to work?
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
