Part 1
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 [...]
In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum horsepower of the engine to be used will be
21
Oct
In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum horsepower of the engine to be used will be In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum [...]
A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump, assuming its efficiency as 50% will be
21
Oct
A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump, assuming its efficiency as 50% will be A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump assuming its efficiency as 50% will [...]
A 2kg block slides on a horizontal floor with a speed of 4m/s. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is 15N and spring constant is 10,000N/m. The spring compresses by:
21
Oct
A 2kg block slides on a horizontal floor with a speed of 4m/s. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is 15N and spring constant is 10,000N/m. The spring compresses by: Work done from d = 0 m to d = 3 m October 21, [...]
A block weighing 10 kg travels down a smooth curved track AB joined to a rough horizontal surface (see the figure.) The rough surface has a friction coefficient of 0.20 with the block. If the block starts slipping on the track from a point 1 m above the horizontal surface, how far will it move on the rough surface?
21
Oct
A block weighing 10 kg travels down a smooth curved track AB joined to a rough horizontal surface (see the figure.) The rough surface has a friction coefficient of 0.20 with the block. If the block starts slipping on the track from a point 1 m above the horizontal surface, how far will it move [...]
A block of mass 100 g is moved with a speed of 5(m)/(s) at the highest point in a closed circular tube of radius 10 cm kept in a vertical plane. The cross-section of the tube is such that the block just fits in it. The block makes several oscillations inside the tube and finally stops at the lowest point. The work done by the tube on the block during the process will be
21
Oct
A block of mass 100 g is moved with a speed of 5(m)/(s) at the highest point in a closed circular tube of radius 10 cm kept in a vertical plane. The cross-section of the tube is such that the block just fits in it. The block makes several oscillations inside the tube and finally [...]