The density of the universe is
a. equal to the critical density if the universe is closed.
b. equal to the critical density if the universe is flat.
c. greater than the critical density if the universe is flat.
d. greater than the critical density if the universe is open.
e. none of the above
B
You might also like to view...
The mass of a single galaxy might be found by
a. the double galaxy method. b. the rotation curve method. c. the cluster method. d. any of the methods (i.e., double galaxy, rotation curve, cluster) e. none of these methods.
A super-insulated house is at a temperature of 20°C. The temperature outside is 0°C. The surface area of the house is 200 m2, and the emissivity is 1 . Approximately how much energy is radiated (in W) per second?
a. 20 000 b. 2 000 c. 200 d. 2 e. 0.2
A ball is thrown straight up with an initial velocity of 10 m/s. After 3 seconds its velocity will be
A. 29.4 m/s. B. 19.4 m/s. C. -19.4 m/s. D. 0 m/s. E. -29.4 m/s.
Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter b. one half c. the same as d. twice e. four times