Advertisements
Advertisements
प्रश्न
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
पर्याय
6 ×103 J
6 J
0.6 J
zero
उत्तर
zero
Explanation:
The gravitational force on the bag, i.e. the weight of the bag is in a vertically downward direction whereas the distance moved by her is in the horizontal direction. It means that the force and displacement are perpendicular to each other, therefore no work is done.
APPEARS IN
संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
State whether the object possess kinetic energy, potential energy, or both :
A bird running on the ground ____________.
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same :
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
light energy into heat energy.
A bulb lights up when connected to a battery. State the energy change which takes place :
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
A microphone converts :
