Advertisements
Advertisements
प्रश्न
No work is done by a force if the body
पर्याय
moves in direction of force
does not move
moves in opposite direction
none of the these
Advertisements
उत्तर
does not move
APPEARS IN
संबंधित प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
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.
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Name the physical quantity associated with the 'rate of doing work'.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
