Rotational Power
Trending Questions
Q. The angular velocity of a body is →ω=2ˆi+3ˆj+4ˆk and a torque →τ=ˆi+2ˆj+3ˆk acts on it. The rotational power will be
- 20 W
- 15 W
- √17W
- √14W
Q. An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver
- 350 N-m
- 440 N-m
- 531 N-m
- 628 N-m
Q. Due to application of a torque having a magnitude of 20 N-m, a ring is rotating at an angular velocity of 250 rads at any given instant. What is the power delivered at this moment?
- 2500 J/s
- 5000 J/s
- 1000 J/s
- 1250 J/s
Q. When a solid sphere is released on a fixed rough inclined plane so that it rolls purely. When it reaches the ground it has the translational kinetic energy of 100 J. What would have been the translational kinetic energy at the bottom, if the plane was smooth? (In J) :-


Q. An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver
- 350 N-m
- 440 N-m
- 531 N-m
- 628 N-m
Q. Due to application of a torque having a magnitude of 20 N-m, a ring is rotating at an angular velocity of 250 rads at any given instant. What is the power delivered at this moment?
- 2500 J/s
- 1000 J/s
- 1250 J/s
- 5000 J/s
Q. Engine of a car supplies constant power to the wheels of car, then
- displacement of the car is proportional to t2.
- velocity of the car is proportional to t1/2.
- acceleration of the car is proportional to t−1.
- displacement of the car is proportional to t3.
Q. Calculate the torque developed by an airplane engine whose output is 3200 HP at an angular velocity of 2400 rev/min. (1 HP=746 J/s)
- 1273 N-m
- 2984 N-m
- 5000 N-m
- 9498 N-m
Q. A force F=10 N is acting on pulley of mass M=2 kg and radius R=1 m as shown in the figure. If pulley is rotating with constant angular velocity ω=4 rad/s. Find the power delivered by the force F to the pulley.


- 20 J/s
- 10 J/s
- 30 J/s
- 40 J/s
Q. A uniform solid cylinder of radius R=15 cm rolls over a horizontal plane passing into an inclined plane forming an angle α = 30∘ with the horizontal. Find the maximum value of the velocity v∘ which still permits the cylinder to roll onto the inclined plane section without a jump. Assume there is no sliding between the cylinder and surfaces.


- 1 m/s
0.5 m/s- 2 m/s
- 4 m/s