विषयों
अध्याय
विषयों
मुख्य विषय
अध्याय
Advertisements
Advertisements
Physics
What is the difference between K.E. and P.E.?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Does the total energy of a body always remain constant?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Advertisements
Can we destroy every energy associated with a body?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Name four different forms of energy.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
What is meant by power?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Write the S.I. units of power.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Define one horse power.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Define the unit 'watt'. How is it related to horse power?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
A body does 20 J of work in 10 s. What is its power?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Name the physical quantity associated with the 'rate of doing work'.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Name the practical unit of power.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
In what form is energy stored in a wrist watch?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Name the physical quantity whose SI unit is Nm.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
A body is pivoted at a point. A force of 10 N is applied at a distance of 30 cm from the pivot. Find the moment of force about the pivot.
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
Is it easier to turn a steering wheel of large diameter than that of small diameter? Why?
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
Concept: undefined >> undefined
