What is a rotation curve?
A) a graph showing how orbital velocity depends on distance from the center for a spiral galaxy
B) a precise description of the shape of a star's orbit around the center of the Milky Way Galaxy
C) a curve used to decide whether a star's orbit places it in the disk or the halo of a spiral galaxy
D) a graph that shows a galaxy's mass on the vertical axis and size on the horizontal axis
A) a graph showing how orbital velocity depends on distance from the center for a spiral galaxy
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Gas in a constant-volume gas thermometer registers a pressure of 75.0 kPa at 0°C. Assuming ideal behavior, what is the pressure of this gas at 200°C?
A) 120 kPa B) 130 kPa C) 140 kPa D) 150 kPa E) 160 kPa
A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
a. 79 b. 318 c. 332 d. 355 e. 402
The period of an Earth satellite depends on the satellite's
A) mass. B) weight on Earth. C) radial distance from Earth. D) all of the above E) none of the above
A ball of mass 3m at speed v approaches a ball of mass 2m at speed -2v and they are about to collide. After the collision, what is the speed of the center of mass?
A. v B. -v/5 C. v/5 D. -v E. Can't decide because we don't know whether this collision is inelastic or elastic