Physics

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 [...]

A man of mass m , standing at the bottom of the staircase of height L climbs it and stands at its top . A man of mass m standing at the bottom of the staircase of height L climbs it and stands at its top . November 9, 2020 Category: Chapter 5 - Work, [...]

Which of the diagrams in figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient depth to impact it a terminal velocity? Which of the diagrams in figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient [...]

In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1m/s at 45^∘ from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10m/s^2, the kinetic energy of the shotput when it just reaches the ground will [...]

A raindrop falling from a height h above ground, attains a near terminal velocity when it has fallen through a height (3/4)h. Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground ? A raindrop falling from a height [...]

A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute its kinetic [...]

Which of the diagrams shown in figure. Most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit ? Which of the diagrams shown in figure. Most closely shows the variation in kinetic energy of the earth as it moves once around the sun [...]

A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure. Correctly shows the displacement-time curve for its motion ? one gradual and the other steep meet at A from where two stones are allowed to slide down from rest one on each [...]