Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? (Take g=10 m/s²).
A force of 10 N acts on a body of 2 kg at rest for 3 seconds. Find the kinetic energy acquired by the body in 3 seconds.
The certain force acting on a 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force.
As shown in the fig. A block of mass ‘m’ is moved on a horizontal surface by applying a constant force ‘F’. The block displaced from the positions A to B by covering a displacement ‘S’ in time t seconds.
The cricket ball of mass 70 g moving with velocity of 0.5 m/s is stopped by a player in 0.5 second. What will be the force applied by the player to stop the ball?
A truck of mass m is moved under a force F. If the truck is loaded with an object equal to the mass of the truck and the driving force is halved, then the acceleration changes by [[1]] of previous acceleration.
A body with mass 5kg is acted upon by a force f=(−3i^+4j^)N. If its initial velocity at t=0, v=(6i^−12j^)ms−1, the time at which it will just have a velocity along the y axis is
A block of mass 10 kg , moving in x direction with a constant speed of 10 ms-1, is subjected to a retarding force F = 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE will be
A force F acting on an object varies with distance r as shown here. The force is in newton and x in metre. The work done by the force in moving the object from x = 0 to x = 6 m is