Question Text
Question 1 :
Compare the power at which a 250 g squirrel climbing up on a tree at a rate of $0.5 ms^{–1}$ is moving upwards against the force of gravity. $(given g = 10 ms^{–2})$
Question 2 :
The sum of the potential energy and kinetic energy of the object would be the same at all points. That is, potential energy + kinetic energy = constant.
Question 3 :
The kinetic energy possessed by an object of mass, m and moving with a uniform velocity, v is _______.
Question 4 :
Let a constant force, F act on an object. Let the object be displaced through a distance, s in the direction of the force. Let W be the work done. So W = ?
Question 5 :
A certain household has consumed 250 units of energy during a month. How much energy is this in joules?
Question 6 :
Avinash can run with a speed of $8 ms^{-1}$ against the frictional force of 10 N, and Kapil can move with a speed of $3 ms^{–1}$ against the frictional force of 25 N. Who is more powerful and why?
Question 7 :
Find the energy possessed by an object of mass 10 kg when it is at a height of 6 m above the ground. Given, g = 9.8 m $s^{-2}$.
Question 8 :
When a body falls freely towards the earth, then its total energy
Question 9 :
A rocket is moving up with a velocity $\upsilon$. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
Question 10 :
The energy possessed by a body due to its change in position or shape is called the potential energy.
