A grinding wheel has a mass of 250 kg and moment of inertia of 500 kg 
A torque of 100 N•m is applied to the grinding wheel. If the wheel starts from rest, what is the angular momentum of the wheel after 5.0 seconds?
A. 650 kg 
B. 500 kg
C. 450 kg
D. 300 kg
E. 250 kg
B. 500 kg
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Vision Problems: Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A. +36.4 cm B. -36.4 cm C. -21.2 cm D. +21.2 cm E. +32.5 cm
What does Einstein's general theory of relativity tell us about two co-orbiting white dwarfs?
A) They will emit gravitational waves that carry energy and angular momentum away from the system, causing the white dwarfs to gradually spiral inward toward each other and eventually merge. B) They will emit gravitational waves that carry energy and angular momentum toward the system, causing the white dwarfs to gradually spiral away from one another and eventually fly far apart. C) They will emit gravitational waves that carry energy and angular momentum away from the system, causing the white dwarfs to quickly spiral away from one another. D) They will never interact with one another.
A rock is dropped from rest off of a high cliff on another planet, planet X. There is no atmosphere, and thus no air resistance, on planet X. At the end of 1 second, the rock is moving at a speed of 6 m/s
At the end of 2 seconds, it is moving at 12 m/s. How fast will the rock be moving at 4 seconds after being dropped? A) 20 m/s B) 40 m/s C) 24 m/s D) 18 m/s E) 36 m/s
The moment of inertia of a solid sphere about any diameter is 2/5 MR2. What is the moment of inertia about an axis that is tangent to the surface?
What will be an ideal response?