Chapter 7 – Work, Energy and Power
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Two masses of 1 g and 9 g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is
16
Sep
Two masses of 1 g and 9 g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is Two masses of 1 g and 9 g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is September 16, 2020 Category: Chapter [...]
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water :
28
Aug
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water : A body of mass 3 kg is under a constant force which causes a [...]
A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = 0.1 x J/m during its travel from x=20m to x=30cm. Its final kinetic energy will be
28
Aug
A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = 0.1 x J/m during its travel from x=20m to x=30cm. Its final kinetic energy will be A body of mass 3 kg is under a constant force which causes [...]
A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8×10^−4 J boy the end of the second revolution after the beginning of the motion?
28
Aug
A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8×10^−4 J boy the end of the second revolution after the beginning of the motion? A Force F=20+10 y [...]
A force F acting on an object varies with distance x as shown in the figure. The force is in N and x in m. The work done by the force in moving the object from x=0 to x=6 m is:
28
Aug
A force F acting on an object varies with distance x as shown in the figure. The force is in N and x in m. The work done by the force in moving the object from x=0 to x=6 m is: A force F acting on an object varies with distance x as shown in [...]
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it,given by the relation s=1/3t^2 , where t is in seconds. Work done by the force in 2 seconds is:-
28
Aug
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it,given by the relation s=1/3t^2 , where t is in seconds. Work done by the force in 2 seconds is:- A body of mass 3 kg is under a constant force which causes a displacement s [...]
A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be :
28
Aug
A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be : A Force F=20+10 [...]
Force F on a particle moving in a straight line varies with distance d as shown in figure. The work done on the particle during its displacement of 12m is:
28
Aug
Force F on a particle moving in a straight line varies with distance d as shown in figure. The work done on the particle during its displacement of 12m is: Force F on a particle moving in a straight line varies with distance d as shown in figure. The work done on the particle during [...]
A Force F = 20 + 10 y acts on a particle in y direction, where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is
28
Aug
A Force F = 20 + 10 y acts on a particle in y direction, where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is A Force F=20+10 y acts on a particle in y direction where [...]
300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. The work done against friction is (Take g = 10m/s^2)
28
Aug
300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. The work done against friction is (Take g = 10m/s^2) 300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. The work done against friction [...]