Advertisements
Advertisements
प्रश्न
State the condition under which the mechanical energy is conserved.
Advertisements
उत्तर
Mechanical energy is conserved only when there are no frictional forces for a given system (i.e., between the body and the air). Thus, conservation of mechanical energy is strictly valid only in vacuum, where friction due to air is absent.
APPEARS IN
संबंधित प्रश्न
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
A ball of mass 0.5 kg slows down from a speed of 5 m/s so that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
light energy into heat energy.
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
When an object falls freely towards the earth, then its total energy :
A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 s is
