Class 11 Physics: Work, Energy and Power (Hard)

1. Q1. A body of mass 'm' is accelerated uniformly from rest to a speed 'v' in time 't'. The instantaneous power delivered to the body at any time 'T' (0 < T < t) is:
   • mv^2/t^2 * T
   • mv^2/t^3 * T^2
   • m v^2 T / t
   • m v^2 T / t^2
2. Q2. A particle moves along the X-axis from x=0 to x=5m under the influence of a force F = (7 - 2x + 3x^2) N. The work done in joules is:
   • 135 J
   • 70 J
   • 270 J
   • 35 J
3. Q3. A spring is stretched by 5 cm by a force of 10 N. The work done in stretching the spring by an additional 5 cm will be:
   • 1.0 J
   • 0.5 J
   • 0.75 J
   • 0.25 J
4. Q4. An engine pumps water continuously through a hose. Water leaves the hose with a velocity 'v' and 'm' is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
   • m v^3 / 2
   • 1/2 * m v^2
   • m v^2 / 2
   • m v^3
5. Q5. A ball is dropped from a height 'h' onto a horizontal surface. If the coefficient of restitution is 'e', the height to which it rebounds after 'n' impacts is:
   • e^(n)h
   • e^(2n)h
   • e^(n+1)h
   • e^(2n-1)h

+ 5 more in the printable PDF.