Advertisements
Advertisements
Question
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The total energy possessed by the body at any instant? (Take g = 10 ms-2).
Advertisements
Solution
The total energy possessed by the body at
any instant remains constant for free-fall
It is equal to the sum of P.E. and K.E
∴ At height 10 m , i.e. at top most point K.E = 0
∴ Total energy = P.E. + K.E.
Total energy = 500 + 0 = 500 J
RELATED QUESTIONS
(i) The conversion of part of the energy into an undesirable form is called ______________.
(ii) For a given height h, __________________ the length l of the inclined plane, lesser will be the effort required.
State the changes in form of energy while producing hydro electricity.
Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.
Name three non-renewable sources of energy.
State whether a solar cell produces a.c. or d.c.
State two disadvantages of using wind energy for generating electricity.
Explain the principle of generating electricity from hydro energy.
Name the two groups in which various sources of energy are classified?
Explain the principle of working of the windmill for generating electricity.
Give one example when:
Kinetic energy changes to heat energy.
