Advertisements
Advertisements
प्रश्न
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
उत्तर
The work done on a body moving in a circular path is zero.
APPEARS IN
संबंधित प्रश्न
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
The moon is revolving around the earth in a circular path. How much work is done by the moon?
State the SI unit of work.
Explain by an example that a body may possess energy even when it is not in motion.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Give two examples of couple action in our daily life.
Name the force acting away from the centre of circular path.
What do you mean by a kilo joule?
How many joules are there in 1 mega joule?
Write an expression for work done by a force depends?
Can every force produce work?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).