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Class XI Physics Work, Energy and Power 3
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Question 1
A bullet is fired at a plank of wood with a speed of 200 ms–1. After passing through the plank, its speed reduces to 180 ms–1. Another bullet, of the same mass and size but moving with a speed of 100 ms–1 is fired at the same plank. What would be the speed of this bullet after passing through the plank? Assume that the resistance offered by the plank is the same for both the bullets?
Question 2
A point particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction, between the particle and the rough track equals 
. The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR.
The values of the coefficient of friction
and the distance x(= QR), are respectively close to
. The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR. The values of the coefficient of friction
and the distance x(= QR), are respectively close to Question 3
A block of mass M is attached with a spring of spring constant K. The whole system is placed on a vehicle as shown in the figure. If the vehicle starts moving towards right with an acceleration ‘a’ (there is no friction anywhere), then
Question 4
A body of mass m, accelerates uniformly from rest to v1 in time t1. The instantaneous power delivered to the body as a function of time t is
Question 5
A block of mass m is allowed to slide down a fixed smooth inclined plane of angle θ and length η. What is the power developed by the force of gravity when the block reaches the bottom?
Question 6
A mass 'm' moves with a velocity v and collides inelastically with another identical mass. After the collision, the 1st mass moves with velocity 
in a direction perpendicular to the initial direction of motion. Find the speed of the 2nd mass after the collision
in a direction perpendicular to the initial direction of motion. Find the speed of the 2nd mass after the collision Question 7
A constant power P is applied to a car starting from rest. Then if in time t the car travels a distance x, its kinetic energy will be proportional to -
Question 8
A body of mass m is projected at an angle θ to the horizontal with initial velocity u. The mean power developed by the gravity over the time of flight is–
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Aug 25JEE & BITSAT
