11th Physics Weekly Test - 4 ( Work, Energy and Power )

MABS Institution

11th Physics Weekly Test - 4 ( Work, Energy and Power )-Aug 2020

Time : 1.30 Hours

Part - A

Generic 3 - Answer All Question

After perfectly inelastic collision between two identical particles moving with same speed in different directions, the speed of the particles become half the initial speed. Find the angle between the two before collision.

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 do you mean by "Perfect elastic"?

To simulate car accidents, auto manufacturers study the collisions of moving cars with mounted springs of different spring constants. Consider a typical simulation with a car of mass 1000 kg moving with a speed 18.0 krnh^-1 on a smooth road and colliding with a horizontally mounted spring of spring constant 6.25 x 10^-3Nm^-1. What is the maximum compression of the spring?

A body of mass m is attached to the spring which is elongated to 25 cm by an applied force from its equilibrium position.
(a) Calculate the potential energy stored in the spring-mass system?
(b) What is the work done by the spring force in this elongation?
(c) Suppose the spring is compressed to the same 25 cm, calculate the potential energy stored and also the work done by the spring force during compression. (The spring constant, k= 0.1 N m^-1).

A ball of mass0.1 kg collides elastically with a ban of unknown mass at rest. If 0.1 kg ball rebounds at 1/3 of the original speed, find the mass of other ball.

Show graphically that the total energy of a body falling under gravity is constant.

A lighter particle moving with a speed of 10 ms^-1 collides with an object of double its mass moving in the same direction with half its speed. Assume that the collision is a one dimensional elastic collision. What will be the speed of both particles after the collision?

A bob is pulled sideways so that string becomes parallel to horizontal and released. Length of the pendulum is 2 m. If due to air resistance loss of energy is 10%, what is the speed with which the bob arrived at the lowest point?

What is mechanical energy? What are its two types?

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11th Physics Weekly Test - 4 ( Work, Energy and Power )

MABS Institution

11th Physics Weekly Test - 4 ( Work, Energy and Power )-Aug 2020

Part - A

Generic 3 - Answer All Question

After perfectly inelastic collision between two identical particles moving with same speed in different directions, the speed of the particles become half the initial speed. Find the angle between the two before collision.

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 do you mean by "Perfect elastic"?

A ball of mass0.1 kg collides elastically with a ban of unknown mass at rest. If 0.1 kg ball rebounds at 1/3 of the original speed, find the mass of other ball.

Show graphically that the total energy of a body falling under gravity is constant.

A lighter particle moving with a speed of 10 ms-1 collides with an object of double its mass moving in the same direction with half its speed. Assume that the collision is a one dimensional elastic collision. What will be the speed of both particles after the collision?

A bob is pulled sideways so that string becomes parallel to horizontal and released. Length of the pendulum is 2 m. If due to air resistance loss of energy is 10%, what is the speed with which the bob arrived at the lowest point?

What is mechanical energy? What are its two types?

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Tamilnadu Stateboardszs - Class

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.

A lighter particle moving with a speed of 10 ms^-1 collides with an object of double its mass moving in the same direction with half its speed. Assume that the collision is a one dimensional elastic collision. What will be the speed of both particles after the collision?