1. Will the momentum remain constant if some external force acts on the
system? (1)
2. The Earth moving round the Sun in a circular orbit is acted upon by a force, and hence work must be done on the Earth by this force. Do you agree with this statement?
3. Suppose a cyclist is negotiating a curve of radius r with speed v . Write the conditions under which skidding will occur. (1)
4. Why do small bubbles have excess of pressure? (1
5. Why does a cricket player lower his hands while catching a ball? (1)
6. A body of mass 5 kg is acted upon by two perpendicular forces of magnitude 8 N and 6 N. Find the magnitude and direction of the acceleration. (2)
7. A ball is dropped vertically from rest at a height of 12 m. After striking the ground, it bounces to a height of 9 m. What fraction of kinetic energy does it loose on striking the ground?
8.If the angular momentum is conserved in a system whose moment of
inertia is decreased. Will its rotational kinetic energy be also conserved?
9.Assuming that the Earth’s orbit is a circle of radius1.5 x100000000
km . Calculate the mass of the sun.
10.. (i) Distinguish between an isothermal and an adiabatic process.
11. Distinguish between an isochoric and isobaric processes.
12.It is easier to pull a lawn roller than to push it. Explain using the resolution of forces.
13.Two billiard balls, each of mass 0.05 kg moving in opposite directions with speed 6m/s collide and rebound with the same velocity. What is the impulse imparted to each ball due to the other?
14.Prove that the impulse received during an impact is equal to the total change in momentum produced during the impact.
15.Oil spreads over the surface of water, whereas water does not spread over the surface of oil. Why?
16.
A balloon is ascending at the rate of 14 ms -1 at a height of 98 m above the ground, when a packet is dropped from it. After how much time and with what velocity does it reach the ground?
17.Prove that the isothermal elasticity of a gas is equal to its pressure.
18.Prove that the adiabatic elasticity of the gas = P , where P is pressure of the gas and Cp /Cv ,Cp and Cv being the specific heats of the gas at constant pressure and constant volume respectively
2. The Earth moving round the Sun in a circular orbit is acted upon by a force, and hence work must be done on the Earth by this force. Do you agree with this statement?
3. Suppose a cyclist is negotiating a curve of radius r with speed v . Write the conditions under which skidding will occur. (1)
4. Why do small bubbles have excess of pressure? (1
5. Why does a cricket player lower his hands while catching a ball? (1)
6. A body of mass 5 kg is acted upon by two perpendicular forces of magnitude 8 N and 6 N. Find the magnitude and direction of the acceleration. (2)
7. A ball is dropped vertically from rest at a height of 12 m. After striking the ground, it bounces to a height of 9 m. What fraction of kinetic energy does it loose on striking the ground?
8.If the angular momentum is conserved in a system whose moment of
inertia is decreased. Will its rotational kinetic energy be also conserved?
9.Assuming that the Earth’s orbit is a circle of radius1.5 x100000000
km . Calculate the mass of the sun.
10.. (i) Distinguish between an isothermal and an adiabatic process.
11. Distinguish between an isochoric and isobaric processes.
12.It is easier to pull a lawn roller than to push it. Explain using the resolution of forces.
13.Two billiard balls, each of mass 0.05 kg moving in opposite directions with speed 6m/s collide and rebound with the same velocity. What is the impulse imparted to each ball due to the other?
14.Prove that the impulse received during an impact is equal to the total change in momentum produced during the impact.
15.Oil spreads over the surface of water, whereas water does not spread over the surface of oil. Why?
16.
A balloon is ascending at the rate of 14 ms -1 at a height of 98 m above the ground, when a packet is dropped from it. After how much time and with what velocity does it reach the ground?
17.Prove that the isothermal elasticity of a gas is equal to its pressure.
18.Prove that the adiabatic elasticity of the gas = P , where P is pressure of the gas and Cp /Cv ,Cp and Cv being the specific heats of the gas at constant pressure and constant volume respectively
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