List of top Physics Questions on work, energy and power asked in MET

A particle is projected with speed \(4\,km/s\). Find maximum height (in km). Radius of earth \(=6400\,km\), \(g=9.8\,m/s^2\).
The work done by all the forces (external and internal) on a system is equal to change in
The ratio of KE required to be given to the satellite to escape earth's gravitational field to the KE required to be given, so that the satellite moves in a circular orbit just above earth's atmosphere is :
A ball falls vertically on to a floor, with momentum \(p\), and then bounces repeatedly, the coefficient of restitution is \(e\). The total momentum imparted by the ball to the floor is:
A bullet is fired by a light rifle and the other with a heavy rifle by the same force. Which rifle will cause more injury to the shoulder?
The displacement x and time t for a particle are related to each other as \( t = \sqrt{x} + 3 \). What is work done in first 6 s of its motion?
An object A moving horizontally with kinetic energy of 800 J experiences a constant opposing force of 100 N, while moving from a place x to a place y, where xy is 2 m. What is the energy of A at y?
How much deep inside the earth (radius \(R\)) should a man go, so that his weight becomes one-fourth of that on the earth’s surface?
A body of mass \( m \) rises to a height \( h = \frac{R}{5} \) from the earth's surface, where \( R \) is the earth’s radius. If \( g \) is acceleration due to gravity at the earth’s surface, then the increase in potential energy is:
A force F acting on a body depends on its displacement S as \(F \propto S^{-1/3}\). The power delivered by F will depend on displacement as
A body moves a distance of 10 m under the action of force \(F = 10\) N. If the work done is 25 J, the angle which the force makes with the direction of motion is
A body of mass 8 kg is moved by a force \(F = 3x\) N, where x is the distance covered. Initial position is x = 2 m and the final position is x = 10 m. The initial speed is zero. The final speed is
A particle moves along x-axis under force \(F(x) = -kx + ax^2\). Find nature of potential energy graph.
The kinetic energy of a particle moving along a circle of radius \(R\) depends on distance as \(K = \frac{as}{R}\). Find force.
The maximum current that can flow in the fuse wire before it blows out, varies with the radius \(r\) as
A simple pendulum has time period \(T_1\). The point of suspension is now moved upward according to the relation \(y = kt^2\) where \(k = 1\) ms\(^{-2}\). The time period now becomes \(T_2\). The ratio \(\frac{T_1^2}{T_2^2}\) is \((g = 10\) m/s\(^2)\)
The speed of a wave on a string is 150 m/s when the tension is 120 N. The percentage increase in the tension in order to raise the wave speed by 20% is
The speed with which the earth have to rotate on its axis so that a person on the equator would weigh \((3/5)^{\text{th}\) as much as present. (Radius of earth = 6400 km)}
The rate of flow of glycerine of density \(1.25 \times 10^3\) kg m\(^{-3}\) through the conical section of a pipe if the radii of its ends are 0.1 m and 0.04 m and the pressure drop across its length 10 N m\(^{-2}\) is
Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field through both coils, if the same current is flown
The force constant of weightless spring is 16 N/m. A body of mass 1.0 kg suspended from it is pulled down through 5 cm and then released. The maximum kinetic energy of the system (spring + body) will be:
Water is falling on the blades of a turbine at a rate of 100 kg/s. If the height of the fall is 100 m, the power transferred to the turbine will be approximately:
How much energy will be necessary for making a body of 500 kg escape from the Earth? (\( g = 9.8 \, \text{m/s}^2 \), radius of the Earth \( = 6.4 \times 10^6 \, \text{m} \))
A force of 10 N acts on a body of mass 20 kg for 10 s. Change in its momentum is:
In which case does the potential energy decrease?