A ball weighing 4 kg of density 4000 kg/m3 is completely immersed in water of density1000 kg/m3. The value of buoyant force acting on the ball is [[1]] N.(Take g = 10 m/s2)
A force applied on a body of mass 4 kg for 5 seconds changes its velocity from10 m/s to 20 m/s. The power required is [[1]] W.
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
