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At any instant of time t, the displacement of any particle is given by 2t -1 (SI unit) under the influence of force of 5N. The value of instantaneous power is (in SI unit):
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- 1)
The power in a circuit having voltage V and current I during time interval t is:
- 2)
What is the power rating of a device that draws 1.75 A of current when connected to a 180-V source?
- 3)
The work done by a constant force of 5 Newton acting on a body is 5 joules. The displacement of the body in the direction of the applied force is ______.
- 4)At any instant of time t, the displacement of any particle is given by 2t -1 (SI unit) under the influence of force of 5N. The value of instantaneous power is (in SI unit):
- 5)An electric lift with a maximum load of 2000 kg (lift + passengers) is moving up with a constant speed of 1.5 ms⁻¹. The frictional force opposing the motion is 3000 N. The minimum power delivered by the motor to the lift in watts is : (g = 10 m s⁻²)
- 6)Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s²)
- 7)When an α-particle of mass ‘m’ moving with velocity ‘v’ bombards on a heavy nucleus of charge ‘Ze’, its distance of closest approach from the nucleus depends on m as:
- 8)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 - 9)When an object is shot from the bottom of a long smooth inclined plane kept at an angle
with horizontal, it can travel a
along the plane. But when the inclination is decreased to
and the same object is shot with the same velocity, it can travel
Then
will be:
- 10)Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take g constant with a value 10 m/s². The work done by the (i) gravitational force and the (ii) resistive force of air is
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