The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is concentrated near the center of the galaxy.
B) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk.
C) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center.
D) No, we cannot determine anything about the location of dark matter from the rotation curve.
C
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Pressure: A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A. 0.18 N/m2 B. 0.36 N/m2 C. 1800 N/m2 D. 3600 N/m2
For this situation, I push on a heavy chair.Suppose I push very hard on the chair, and this time the chair moves and I slip backward as well. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.
When a rigid body rotates about a fixed axis all the points in the body have the same tangential speed
Indicate whether the statement is true or false
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 31 N B. 36 N C. 41 N D. 46 N E. 23 N