The diagram below shows a light curve from a supernova. How many days after maximum light did it take for the supernova to decrease in brightness by a factor of 100?
a.
less than 50
b.
50
c.
150
d.
250
e.
more than 250
C
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Which of the following is TRUE?
A) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies. B) At the time that the Big Bang expansion began, all matter and energy in our observable universe was compressed into a single point of space. C) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. D) A redshift occurs when a photon loses energy and slows down as it moves through space. E) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift.
The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800. The car is on a level circular track of 50.0 m radius on a planet where 
compared to Earth's 
. If the car is to be able to travel at the same speed on the planet as on Earth, the radius of the track on the
planet must be ____ times as large as the radius of the track on Earth. A. 0.250 B. 0.500 C. 1.00 D. 2.00 E. 4.00
During an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much energy via heating is added to the gas during this process?
A) 0 J B) 50 J C) -50 J D) 25 J E) -25 J
The direction of the magnetic field of a bar magnet is
a. in the direction opposite to that in which a compass would point. b. in any direction. c. toward the south pole. d. toward the north pole.