Chapter 5 – Work, Energy and Power

A graph of potential energy V(x) verses x is shown in figure. A particle of energy E0 is executing motion in it. Draw graph of velocity and kinetic energy versus x for one complete cycle AFA. A graph of potential energy V(x) verses x is shown in figure. A particle of energy E0 is executing [...]

A bob of mass m suspended by a light string of length L is whirled into a vertical circle as shown in figure. What will be the trajectory of the particle if the string is cut at A bob of mass m suspended by a light string of length L is whirled into a vertical [...]

Two bodies of unequal mass are moving in the same direction with equal kinetic energy. The two bodies are brought to rest by applying retarding force of same magnitude. How would the distance moved by them before coming to rest compare? A man of mass m standing at the bottom of the staircase of height [...]

The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times in a minute. The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times [...]

Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20 seconds. Calculate the power of a crane in watts which lifts a mass of 100 kg to a height of 10 m in 20 seconds. November 9, 2020 Category: Chapter 5 - [...]

In an elastic collision of two billiard balls, which of the following quantities remain conserved during the short time of collision of the balls (i.e., when they are in contact). (a) Kinetic energy . (b) Total linear momentum ? Give reason for your answer in each case. In an elastic collision of two billiard balls [...]

Calculate the work done by a car against gravity in moving along a straight horizontal road. the mass of the car is 400 kg and the distance moved is 2 m. Calculate the work done by a car against gravity in moving along a straight horizontal road. the mass of the car is 400 kg [...]

A body is being raised to a height h from the surface of earth. What is the sign of work done by (a)applied force (b)Gravitational force A body is being raised to a height h from the surface of earth. What is the sign of work done by (a)applied force (b)Gravitational force November 9, 2020 [...]

A rough inclined plane is placed on a cart moving with a constant velocity u on horizontal ground. A block of mass M rests on the incline. Is any work done by force of friction between the block and incline? Is there then dissipation of energy? A man of mass m standing at the bottom [...]

Two blocks M1 and M2 having equal mass are free to move on a horizontal frictionless surface. M2 is attached to a massless spring as shown in figure. Initially M2 is at rest and M1 is moving toward M2 with speed v and collides head-on with M2. A man of mass m standing at the [...]