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.
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.
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