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प्रश्न
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
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उत्तर
Energy is defined as the capacity of a body to do work. Energy is a scalar quantity. The energy possessed by a body is measured by the amount of work done by a body while changing its state of rest or state of motion.
संबंधित प्रश्न
Define 1 J of work.
The energy of a body is its capacity to do .........
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
How many watts equal one horse power?
State the conditions of equilibrium for a rigid body.
Can work done be zero even if force acts on the body?
Name the physical quantity whose MKS units are kgm2s-3.
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
