Chapter 8 – Work, Energy and Power
Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 1 > Chapter 8 - Work, Energy and Power
Two identical cylindrical vessels, with their bases at the same level, each contain a liquid of density ρ. The height of liquid in one vessel in h 1 and that in the other is h2. The area of either base is A. What is the work done by gravity in equalizing the levels when the vessels are interconnected?
27
Nov
Two identical cylindrical vessels, with their bases at the same level, each contain a liquid of density ρ. The height of liquid in one vessel in h 1 and that in the other is h2. The area of either base is A. What is the work done by gravity in equalizing the levels when the [...]
One end of a spring of natural length h and spring constant k is fixed at the ground and the other is fitted with a smooth ring of mass m which is allowed to slide on a horizontal rod fixed at a height h. Initially, the spring makes an angle of 37° with the vertical when the system is released from rest. The speed of the ring when the spring becomes vertical is
21
Oct
One end of a spring of natural length h and spring constant k is fixed at the ground and the other is fitted with a smooth ring of mass m which is allowed to slide on a horizontal rod fixed at a height h. Initially, the spring makes an angle of 37° with the vertical [...]
A block of mas 2.0 kg is pulled up on a smooth incline of angle 30 degree with the horizontal. If the block moves with an acceleration of 1.0ms^2, find the power delivered by the pulling force at a time 4.0 s after the motion will be
21
Oct
A block of mas 2.0 kg is pulled up on a smooth incline of angle 30 degree with the horizontal. If the block moves with an acceleration of 1.0ms^2, find the power delivered by the pulling force at a time 4.0 s after the motion will be A block of mas 2.0 kg is pulled [...]
A particle of mass m is given a velocity u on a rough horizontal surface of friction coefficient μ. The average power imparted by friction until it stops is
21
Oct
A particle of mass m is given a velocity u on a rough horizontal surface of friction coefficient μ. The average power imparted by friction until it stops is A particle of mass m is given a velocity u on a rough horizontal surface of friction coefficient μ. The average power imparted by friction until [...]
A particle of mass m is thrown with speed u at an angle of projection θ with horizontal. The average power imparted by the gravitational force until it strikes the ground is
21
Oct
A particle of mass m is thrown with speed u at an angle of projection θ with horizontal. The average power imparted by the gravitational force until it strikes the ground is A particle of mass m is thrown with speed u at an angle of projection θ with horizontal. The average power imparted by [...]
Water falling from a 50 m high fall is to be used for generating electric energy. If 18×10^5 kg of water falls per hour and half the gravitational potential energy can be converted into electric energy, how many 100 W lamps can be lit?
21
Oct
Water falling from a 50 m high fall is to be used for generating electric energy. If 18×10^5 kg of water falls per hour and half the gravitational potential energy can be converted into electric energy, how many 100 W lamps can be lit? Work done from d = 0 m to d = 3 [...]
A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car V, the rate at which the engine of the car is doing work will be
21
Oct
A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car V, the rate at which the engine of the car is doing work will be A car of mass m is driven with acceleration a along a [...]
A car of mass 1250 kg is moving at 30(m)/(s). Its engine delivers 30 kW while resistive force due to surface is 750 N. What maximum acceleration can be given to the car
21
Oct
A car of mass 1250 kg is moving at 30(m)/(s). Its engine delivers 30 kW while resistive force due to surface is 750 N. What maximum acceleration can be given to the car A car of mass 1250 kg is moving at 30(m)/(s). Its engine delivers 30 kW while resistive force due to surface is [...]
A body of mass m accelerates uniformly from rest to velocity v0 in time t0. The instantaneous power delivered to the body at any time t is
21
Oct
A body of mass m accelerates uniformly from rest to velocity v0 in time t0. The instantaneous power delivered to the body at any time t is A body of mass m accelerates uniformly from rest to velocity v0 in time t0. The instantaneous power delivered to the body at any time t is October [...]
The power of a water pump is 2 kW. If g=10m/s^2, the amount of water it can raise in 1 min to a height of 10 m is :
21
Oct
The power of a water pump is 2 kW. If g=10m/s^2, the amount of water it can raise in 1 min to a height of 10 m is : the amount of water it can raise in 1 min to a height of 10 m is : The power of a water pump is 2 [...]