Work, Energy, Power and Collision

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What is the energy of a photon required for pair production?

1.02 MeV (correct)

4.08 MeV

0.51 MeV

2.04 MeV

What is the work done by the upward lifting force relative to the porter on the staircase?

F(s+s0)

mgh

zero (correct)

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What is the result of the annihilation of matter?

conversion of energy into matter

creation of gamma radiation (correct)

release of chemical energy

release of kinetic energy

What is the dimension of energy?

[ML^2T^(-2)] Signup and view all the answers

What is the energy released in a nuclear bomb due to mass defect?

gamma radiation and heat Signup and view all the answers

What is the consequence of kinetic energy increasing in a body?

The body moves in the direction of the force Signup and view all the answers

What is the relationship between kinetic energy and linear momentum?

Kinetic energy is directly proportional to linear momentum Signup and view all the answers

What is the significance of the frame of reference in kinetic energy?

Kinetic energy depends on the frame of reference Signup and view all the answers

What happens to the kinetic energy of a body when it is projected upwards under gravity?

The kinetic energy of the body decreases Signup and view all the answers

What is the formula for kinetic energy in relativistic terms?

KE = P^2 / 2m Signup and view all the answers

What is the energy possessed by a body due to its motion?

Kinetic energy Signup and view all the answers

Which unit is used to measure light energy?

Electron volt Signup and view all the answers

What is the device that converts mechanical energy into electrical energy?

Dynamo Signup and view all the answers

What is an example of kinetic energy in use?

A flowing water running a water mill Signup and view all the answers

What is the unit of heat energy?

Calorie Signup and view all the answers

What is the condition for maximum work done by a force?

θ = 0° Signup and view all the answers

In which direction is the force F cosθ applied?

In the direction of the displacement Signup and view all the answers

What is the work done by a force when the angle between the force and displacement is 90°?

0 Signup and view all the answers

Which of the following is an example of positive work?

Lifting a body upwards Signup and view all the answers

What is the formula for the work done by a force when it is applied at an angle θ to the displacement?

Fs cosθ Signup and view all the answers

What is the condition for positive work to be done?

Force and displacement are in the same direction Signup and view all the answers

If multiple forces are acting on a body, how is the total work done calculated?

By taking the dot product of the net force and the displacement Signup and view all the answers

What is the relationship between work and energy?

Work is the transfer of energy Signup and view all the answers

What is an example of a situation where positive work is done?

A person carrying water from a well to their house Signup and view all the answers

What is the mathematical formula for calculating the work done by a force?

W = (F1 + F2 +... + Fn) × (r2 - r1) Signup and view all the answers

What is the condition for force to do maximum work?

Force and displacement are in the same direction Signup and view all the answers

What is the significance of negative work done by a force?

The force is opposite to displacement Signup and view all the answers

In what situation is the work done by the centripetal force always zero?

When a body moves in a circle Signup and view all the answers

What is the situation in which work done is zero?

When a person tries to displace a wall or heavy stone by applying a force and it does not move Signup and view all the answers

What is the condition for work done to be negative?

Force is opposite to displacement Signup and view all the answers