Advertisements
Advertisements
Question
Advertisements
Solution
Given, mass of water = 80 kg
height = 20 m
g = 10 ms-2
time taken = 10s
Work done = mgh = 80 x 10 x 20 = 16000 J
Power = `"work done"/"time taken" = 16000/10 = 1600 "watt"`
APPEARS IN
RELATED QUESTIONS
The S.I. unit of work is
Express joule in terms of erg.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
State two advantage of producing hydroelectricity.
Explain by an example that a body may possess energy even when it is not in motion.
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
What is the relationship between Nm and dyne cm?
A uniform circular motion is an accelerated motion. Justify it.
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
What is work?
