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A horizontal force of 5 N is required to maintain a velocity of 2 m/s for a block of 10 kg mass sliding over a rough surface. The work done by this force in one minute is
Work done = Force x displacement = F x s = F x v x t = 5 x 2 x 60 = 600 J
Work done = Force x displacement = F x s = F x v x t = 5 x 2 x 60 = 600 J
A 500 kg rocket travels in deep space at a constant speed of 3000 m/sec. The power being produced by the rocket engine at this time is
Work done is negative if is
1MWh is equal to _____ joule.
A 1000 Kg truck carrying a load of 500 Kg travels on a mountain for 5 minutes at constant speed. Its power output is 2500 watts. Assuming g=10 m/sec^{2}, it will achieve a vertical height of:
A body of 5 kg has P.E of 98J its height is
A body of 5N falls through 0.25m height its K.E will be
When the force retards the motion of body the work done is
A solar panel delivers 100 watts for one minute. How much energy does it deliver during this period?
Two bodies of 1kg and 2 kg have equal momentum the ratio of their KE is
An electric motor creates tension of 4500N in a cable and reels at 2m/s the power of motor is
A particle moves with under N. the power applied
A moving body need not to have
The kinetic energy of a moving truck is 10^{5} kg m^{2}/sec^{2}. The truck’s brakes fail and it runs into a sugar cane field, coming to rest after 50 m. What is the average retarding force of the sugar cane field?
Rate of doing work is known as
Energy time graph is shown in Fig power deliver
If power of 1 kW is maintained for 1 sec than work done is
What is the mathematical expression for the K.E of a body of mass m moving with speed v
The P.E of mass m at height 50m above the ground is 100J. At what height from the ground its P.E becomes 200 J
A 4kg body is thrown vertically upward from the ground with a velocity of 5m/s. Its K.E just before hitting the ground is
A body falls freely under gravity. Its velocity is v when it has lost a P.E of U. The mass of body is
An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m
If two electrons are forced to come closer to each other, then P.E of the electrons
The amount of work done by a labourer who carries “n” bricks, each of mass ‘m’, to the roof of a house whose height is “h”
Which one of the following is watt
The work done by a force (F) inclined at an angle q with the displacement D.is
A man pushes a wall but fails to displace it. He does
A body is falling freely from A to B, the total energy of body at point C is
A mechanical wrist watch has
Work done by gravity when P.E of body is increased is
The work done in raising a mass of 15 gm from the ground to a table of 1m height is?
A body of mass 5 kg is placed at the origin, and can move only on the xaxis. A force of 10 N is acting on it in a direction making an angle of 60° with the xaxis and displaces it along the xaxis by 4 metres. The work done by the force is
Two persons take different reference states for zero potential energy. The change in potential energy for two persons at same height
Kinetic energy of a body moving with speed of 10 m/s is 30J. If its speed becomes 30 m/s its K.E will be
The time taken by an engine of power 10 kW to lift a mass of 200 kg to the height of 40 m is
Work done by a variable force making angles at different points with displacement in moving the particle from one point to another is equal to the area under the curve of
The average power required to lift a 100kg mass through a height of 50 metres in approximately 50 seconds would be (in J/s)
If linear momentum of body is increased by 1.5%, its kinetic energy increases by…….%
A girl is carrying a bucket of water on her head from water reservoir situated near her house, the work done by her is
For constant force, the shape of the graph between power and velocity will be
A body is subjected to a constant force = . What is the work done by this force in moving the body through a distance of 4m along zaxis and 3m along yaxis?
A car of mass 1000 kg moving on a horizontal road with a steady speed of 10 m/sec has total frictional force on it of 400 N. The power due to engine is
A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to.
In case of work done by variable force we obtain an exact result for work done from equation , if
Force F on a particle moving in a straight line varies with distance d as shown in the figure. The work done on the particle during its displacement from 3m to 12m
In which given case more work is done
A body is thrown vertically upward which of following statement is correct
A machine needed 1000J of energy to raise a 10 kg block at a distance of 6.0m. what is the machine efficiency?
If a machine moves a load W through a distance h then the useful work done by the machine is
How much time will be required to perform 520 J of work at the rate of 20 W?
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