Engineering Board Exam Reviewer · Physics · medium
What is the moment of inertia of a solid disk of mass 10 kg and radius 0.3 m about its central axis?
- 0.900 kg· m2
- 0.360 kg· m2
- 0.450 kg· m2
- 1.500 kg· m2
Answer
C. 0.450 kg· m2
Solution
I = 1/2MR2 = 1/2(10)(0.32) = 0.450 kg· m2.
More Physics questions
- A 20 g bullet moving at 300 m/s embeds itself in a 2 kg wooden block hanging as a ballistic pendulum. How high does the block rise? (g =…
- A ball dropped from a height of 2 m rebounds with a coefficient of restitution of 0.8. How high does it rise after the first bounce?
- A 2 kg ball moving at 5 m/s makes a head-on, perfectly elastic collision with a stationary 3 kg ball. What is the velocity of the 3 kg…
- A 2000 kg truck moving at 10 m/s collides with a stationary 1000 kg car and they stick together. What percentage of the initial kinetic…
- A 2000 kg truck moving at 10 m/s collides with a stationary 1000 kg car, and they stick together. What is their common velocity just after…
- A bat delivers an impulse of 13.5 N· s to a ball during a contact time of 5 ms. What is the average force on the ball?
- A 0.15 kg ball moving at 40 m/s is hit back in the opposite direction at 50 m/s. What is the magnitude of the impulse on the ball?
- What is the momentum of a 0.15 kg ball moving at 40 m/s?
- A motor exerts a constant force of 2000 N to move a load at a steady 15 m/s. What power does it deliver?
- A 60 kg person runs up a flight of stairs 4 m high in 6 s. What average power is developed? (g = 9.81 m/s2)