Advertisements
Advertisements
Question
A body of mass 50 kg has a momentum of 3000 kg−1 ms. Calculate:
(j) the kinetic energy of the body.
(ii) the velocity of the body.
Advertisements
Solution
(i) m = 50 kg, p = 3000 kg ms−1
p = mv
v = `"P"/"m"=3000/50` = 60 ms−1
Kinetic energy of the body =`1/2` mv2
`=1/2xx50xx(60)^2` = 25 × 3600
= 90000 J
(ii) Velocity of the body v = 60 ms−1
RELATED QUESTIONS
What is geothermal energy?
(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.
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?
Name the type of energy (kinetic or potential) possessed by the following:
A stone at rest on the top of a building.
What is solar energy?
State two disadvantages of using nuclear energy for producing electricity.
Name the energy changes for the following:
bicycle brakes
Calculate the decrease in the kinetic energy of a moving body if its velocity reduces to half of the initial velocity.
What happens to the K.E. when
(i) the mass of the body is doubled at a constant velocity and
(ii) the velocity of the body is doubled at constant mass?
Can you tell?
What are the various forms of energy?
