What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?
a. Small velocities are seen at large distances from the galactic center.
b. Small velocities are seen at distances close to the galactic center.
c. Large velocities are seen at large distances from the galactic center.
d. Large velocities are seen at distances close to the galactic center.
c
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Kepler's third law relates the square of the planet's orbital period in years to the cube of its average distance from the Sun in astronomical units
Indicate whether the statement is true or false
Kinetic Energy: Which one has larger kinetic energy: a 500-kg object moving at 40 m/s or a 1000-kg object moving at 20 m/s?
A. The 500-kg object B. The 1000-kg object C. Both have the same kinetic energy.
When introduced into a region where an electric field is present, a proton with initial velocity 
will eventually move
A. along an electric field line, in the positive direction of the line. B. along an electric field line, in the negative direction of the line. C. to a point of decreased potential. D. to a point of decreased potential. E. as described in both (a) and (c).
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