Work Energy And Power

In an inelastic collision, momentum is conserved but kinetic energy is not conserved.

Here, Capacity of the tank =
Time taken by the pump to fill the tank,

Height through which water is lifted,
Efficiency of the pump,
As density of water
Mass of water pumped
= volwne density

Work done by the pump,


Output power of the pump

As , Input power =

Normal reaction on the-mass by the table is perpendicular to the horizontal displacement. Hence work done by normal reaction will be zero.

We will use the work-energy principle to solve this problem. The work done by the resistive force is equal to the change in kinetic energy. The kinetic energy is given by: where is the mass of the scooter and is its speed. The initial kinetic energy of the scooter before stopping is: The final kinetic energy is zero because the scooter is stopped. The work done by the resistive force is given by: where is the distance over which the force acts (10 m). By the work-energy principle: Substituting the values: We know the weight , so . Substitute this into the equation: Since , substitute that in: Simplifying further: Now, to find the total resistance to the motion, we note that the resistance is proportional to the weight of the scooter .
Thus, the total resistance to the motion of the scooter is: