SAEED MDCAT
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Work done by conservative force is
A particle of mass 2 kg is in circular motion with velocity 5 m/s ^{2}, radius of path is 2 m what will be the work done by the centrifugal force in half cycle
A force F = (0.5x +10) N acts on a particle, calculate the work done by the force in displacing particle from x=0 to x=2 m
Effect of work is equal to
A constant force of F= (i 2j – 3k) causes a displacement d = (2i – 5j + k), what will be the net work done if F in N and displacement is in meter
A gardener moves a lawn roller through a distance of 50 m. Applied force is 50 N inclined at 60 degrees of direction of motion what will be the work done by the gardener
What is kinetic energy of body 5kg and momentum 15 kg.m/sec
Work done by nonconservative force is
Two forces of F1 =5 N and F2= 15 N are working on a body in opposite direction. If body displaced by 5 m in direction of net force, what will be the work done by F1
When a spring is stretched, work done by stretching force is
KE of body is increased by 44 %, what is the percentage increase in the momentum
Work done on a ceiling fan by gravity is
A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is
When a body moves vertically upward, the work done will be
A body moves a distance of 10 m along a straight line under the action of 5 N force. If work done is 25 J, then angle between the force and direction of motion of the body will be:
A force F = 7 – 2x+3xx ^{2}is applied on 2kg body, work done to displace the body from x =0 to x=5 m
Work done by friction force is always
When a man walks on a surface horizontally with constant velocity, work done by
When brakes are applied to moving vehicle, the work done by the braking system is
A horse is pulling a cart of mass 50 kg in the horizontal direction, if the distance travelled is 20m then what will be the work done by normal force
A position dependent force F= 72*x + 3*x ^{2} N act on a body of mass 2 kg and displaces it from x= 0 to x = 5, the work done in joule is
Work done by a conservative force in a complete cycle is
Two forces of F1 =5 N and F2= 15 N are working on a body in opposite direction. If body displaced by 5 m in direction of net force, what will be the work done by F2
A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done to raise the bird’s own Centre of mass to the branch? (Assume g = 10 m/s ^{2})
If force is F = 4i – 2j and displacement is d= 3i + 4j, the work done will be
A man pushes a wall and failed to displace it, he does
Consider a drop of water of mass 1 gm falling from a height of 1 km. It hits the ground with a speed of 50 m/s, take g = 10 m/s ^{2}. the work done by resistive force of air is
The work done by the push of air on an object of mass 10 kg falling from rest through a vertical distance of 10 m is 500 J. Find the velocity of the object at the end of 10 m fall: (g = 10 m/s ^{2})
An object is displaced from position vector r1 = (2i + 3j) m to r2 = (4j + 6k) m under a force F= (3x ^{2}i+ 2y j) N. Find the work done by this force
A particle of mass ‘m’ is projected from the ground with an initial speed u0 at an angle ‘a’ with the horizontal. At the highest point of its trajectory, it makes a completely in inelastic collision with another particle of mass which was thrown vertically upward from the ground with the same initial speed u0. The angle that the composite system makes with the horizontal immediately after the collision is:
When work done by force of gravity is negative (only gravity is acting)
If the speed of the body is doubled, then
____work on arbitrary system means a transfer of energy to the system
A stone of mass 1 kg dropped from a height of 10m with the speed of 14 m/s, approximate kinetic energy is
The linear momentum is increased by 10%, percentage change in the kinetic energy will be
A man standing in a bus and pushing the wall of the bus in direction of motion work done by the man is
If the increase in the kinetic energy of a body is 22%, then the increase in the momentum will be:
The body move 10 m along the straight line under the force 5 N, what is the angle between force and displacement
A cubic vessel of height 1 m is full of water, the minimum work done in taking water out
Kinetic energy of the body is increased by the 21 %. what is the percentage change in the linear momentum of the body?
Work done can be calculated by taking:
A body of mass 10 kg is moved parallel to the ground, through a distance of 2 m. The work done against gravitational force is:
Consider a drop of water of mass 1 gm falling from a height of 1 km. It hits the ground with a speed of 50 m/s, take g = 10 m/s^{2}. the work done by gravitational force is:
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