11th Physics Monthly Test - 3 ( Work, Energy and Power )

MABS Institution

11th Physics Monthly Test - 3 ( Work, Energy and Power )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 2 - Answer All Question

Discuss the possibilities of work done to be zero.

A bullet of mass 50 g is fired from below into a suspended object of mass 450 g. The object rises through a height of 1.8 m with bullet remaining inside the object. Find the speed of the bullet. Take g = 10 ms^-2.

The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth. Do you agree with this statement?

What is meant by kinetic energy?

A body is moving along a circular path. How much work is done by the centripetal force?

An object of mass 1 kg is falling from the height h = 10m. Calculate
(a) The total energy of an object at h = 10 m.
(b) Potential energy ofthe object when it is at h = 4 m.
(c) Kinetic energy of the object when it is at h = 4 m.
(d) What will be the speed of the object when it hits the ground?
(Assume g = 10 m s^-2)

What happens to the P.E. of a bubble when it rises in water?

What is meant by potential energy?

Define energy and write its unit and dimension.

A body of mass 10 kg at rest is subjected to a force of 16N. Find the kinetic energy at the end of 10 s.

Define work, energy, power.

Give the unit and dimension of power.

Why should the object be moved at constant velocity when we define potential energy?

Express a unit of electrical energy in terms of joule.

Part - B

Generic 3 - Answer All Question

Calculate the energy consumed in electrical units when a 75 W fan is used for 8 hours daily for one month (30 days)

Two objects of masses 2 kg and 4 kg are moving with the same momentum of 20 kg m s-1
(a) Will they have same kinetic energy?
(b) Will they have same speed?

How high must a body be lifted to gain an amount of P.E.· equal to the K.E. it has when moving at speed 20 ms^-1. (The value of acceleration due to gravity at a place is 9.8 ms^-2).

20 J work is required to stretch a spring through 0.1 m. Find the force constant of the spring. If the spring is further stretched through 0.1 m, calculate work done.

A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m³ in 15 min. If the tank is 40 m above the ground, how much electric power is consumed by the pump. The efficiency of the pump is 30%.

A body is displaced 10 \(\hat{j}\) under the force of \(-2\hat{j}+15\hat{j}+6\hat{i}\ N.\) Calculate the work done.

What is mechanical energy? What are its two types?

Two springs A and B are identical except that A is harder than B (KA> KB) if these are stretched by the equal force. In which spring will more work be done?

Calculate the velocity of the bob of a simple pendulum at its mean position if it is able to rise to a vertical height of 10 cm. Take g = 9.8 m/s².

An object of mass 2 kg is taken to a height 5 m from the ground (g = 10 ms^-2 ).
(a) Calculate the potential energy stored in the object.
(b) Where does this potential energy come from?
(c) What external force must act to bring the mass to that height?
(d) What is the net force that acts on the object while the object is taken to the height 'h'?

What is conservative force? State how it is determined from potential energy?

The potential energy of a spring when stretched through a distance x is 10J. What is the amount of work done on the same spring to sketch it through an additional distance 'x'?

Two identical 5 kg blocks are moving at the same speed of 2 ms^-1 towards each other along a frictionless horizontal surface. The two blocks collide, stick together and come to rest. Consider the two blocks as a system. Calculate work done by (i) external forces and (ii) Internal forces.

A ball bounces to 80% of its original height. Calculate the mechanical energy lost in each bounce.

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11th Physics Monthly Test - 3 ( Work, Energy and Power )

MABS Institution

11th Physics Monthly Test - 3 ( Work, Energy and Power )-Aug 2020

Part - A

Generic 2 - Answer All Question

Discuss the possibilities of work done to be zero.

A bullet of mass 50 g is fired from below into a suspended object of mass 450 g. The object rises through a height of 1.8 m with bullet remaining inside the object. Find the speed of the bullet. Take g = 10 ms-2.

The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth. Do you agree with this statement?

What is meant by kinetic energy?

A body is moving along a circular path. How much work is done by the centripetal force?

What happens to the P.E. of a bubble when it rises in water?

What is meant by potential energy?

Define energy and write its unit and dimension.

A body of mass 10 kg at rest is subjected to a force of 16N. Find the kinetic energy at the end of 10 s.

Define work, energy, power.

Give the unit and dimension of power.

Why should the object be moved at constant velocity when we define potential energy?

Express a unit of electrical energy in terms of joule.

Part - B

Generic 3 - Answer All Question

Calculate the energy consumed in electrical units when a 75 W fan is used for 8 hours daily for one month (30 days)

Two objects of masses 2 kg and 4 kg are moving with the same momentum of 20 kg m s-1 (a) Will they have same kinetic energy? (b) Will they have same speed?

How high must a body be lifted to gain an amount of P.E.· equal to the K.E. it has when moving at speed 20 ms-1. (The value of acceleration due to gravity at a place is 9.8 ms-2).

20 J work is required to stretch a spring through 0.1 m. Find the force constant of the spring. If the spring is further stretched through 0.1 m, calculate work done.

A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. If the tank is 40 m above the ground, how much electric power is consumed by the pump. The efficiency of the pump is 30%.

A body is displaced 10 \(\hat{j}\) under the force of \(-2\hat{j}+15\hat{j}+6\hat{i}\ N.\) Calculate the work done.

What is mechanical energy? What are its two types?

Two springs A and B are identical except that A is harder than B (KA> KB) if these are stretched by the equal force. In which spring will more work be done?

Calculate the velocity of the bob of a simple pendulum at its mean position if it is able to rise to a vertical height of 10 cm. Take g = 9.8 m/s2.

What is conservative force? State how it is determined from potential energy?

The potential energy of a spring when stretched through a distance x is 10J. What is the amount of work done on the same spring to sketch it through an additional distance 'x'?

Two identical 5 kg blocks are moving at the same speed of 2 ms-1 towards each other along a frictionless horizontal surface. The two blocks collide, stick together and come to rest. Consider the two blocks as a system. Calculate work done by (i) external forces and (ii) Internal forces.

A ball bounces to 80% of its original height. Calculate the mechanical energy lost in each bounce.

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Tamilnadu Stateboardszs - Class

A bullet of mass 50 g is fired from below into a suspended object of mass 450 g. The object rises through a height of 1.8 m with bullet remaining inside the object. Find the speed of the bullet. Take g = 10 ms^-2.

Two objects of masses 2 kg and 4 kg are moving with the same momentum of 20 kg m s-1
(a) Will they have same kinetic energy?
(b) Will they have same speed?

How high must a body be lifted to gain an amount of P.E.· equal to the K.E. it has when moving at speed 20 ms^-1. (The value of acceleration due to gravity at a place is 9.8 ms^-2).

A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m³ in 15 min. If the tank is 40 m above the ground, how much electric power is consumed by the pump. The efficiency of the pump is 30%.

Calculate the velocity of the bob of a simple pendulum at its mean position if it is able to rise to a vertical height of 10 cm. Take g = 9.8 m/s².

Two identical 5 kg blocks are moving at the same speed of 2 ms^-1 towards each other along a frictionless horizontal surface. The two blocks collide, stick together and come to rest. Consider the two blocks as a system. Calculate work done by (i) external forces and (ii) Internal forces.