Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A) the mass of the sphere.
B) the radius of the sphere.
C) both the mass and the radius of the sphere.
D) neither the mass nor the radius of the sphere.
B
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Multiple-Object Accelerating Systems: Two objects of unequal masses, M and m (M > m), are connected by a very light cord passing over an ideal pulley of negligible mass. When released, the system accelerates, and friction is negligible. 
Which one of the following free-body diagrams most realistically represents the forces acting on the two objects in the moving system?
A. 
B. 
C. 
D. 
An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ? = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?
A. 2.0 kg B. 1.5 kg C. 1.8 kg D. 1.2 kg E. 0.80 kg
Which of the following worlds has the most substantial atmosphere?
A) the Moon B) Earth C) Venus D) Mercury E) Mars
Explain the significance of the center of gravity
What will be an ideal response?