A totally eclipsed moon glows coppery red because
a. the moon' surface is made of iron ore which is red in color.
b. red light is cooler than blue light.
c. during a lunar eclipse the sun is cooler than normal and its light is more red.
d. only red light is able to pass completely through Earth's atmosphere and reach the moon.
e. the moon appears red during a total solar eclipse, not a total lunar eclipse.
D
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A 2000 kg car is traveling at 20.0 m/s down a long mountain grade of 1.00%. The mountain road is 3.00 km long. The heat generated at the brakes due to friction heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 22.3 
B. 35.1
C. 40.2
D. 45.2
E. 53.6
A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
A. 22 J B. 24 J C. 26 J D. 20 J E. 28 J
A car is moving with a constant acceleration. At time t = 5.0 s its velocity is 8.0 m/s in the forward direction, and at time t = 8.0 s its velocity is 12.0 m/s forward. What is the distance traveled in that interval of time?
A) 40 m B) 30 m C) 20 m D) 50 m E) 10 m
Consider the n = 10 shell
(a) What is the largest value of the angular momentum quantum number, ?, in this shell? (b) How many electrons can be placed in this shell?