Does the Total Energy of a Body Always Remain Constant? - Physics

Does the total energy of a body always remain constant?

एक पंक्ति में उत्तर

No, total energy of a body does not remain constant but the total energy of a closed system remains constant e.g. universe.

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अध्याय 1: Force, Work, Energy and Power - Exercise 1.5 ii [पृष्ठ ५४]

अध्याय 1 Force, Work, Energy and Power
Exercise 1.5 ii | Q 3 | पृष्ठ ५४

State the S.I. unit of work and define it.

MULTIPLE CHOICE TYPE

In an electric cell which in use, the change in energy is from:

The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?

Write an expression for the work done against gravity.

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.

State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.

A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.