The further away a galaxy is:
A) the older it is.
B) the further ahead in the future it will exist.
C) the longer ago it existed.
D) the larger it appears.
E) the more massive it is.
C
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A brass plate with a thickness of 1.00 cm is placed over a copper plate with a thickness of 2.00 cm. The coefficient of thermal conductivity of brass is 100 W/m 
and of copper is 400 W/m 
What is the effective coefficient of thermal conductivity for the brass-copper layer?
A. 150 W/m 
B. 200 W/m
C. 250 W/m
D. 300 W/m
E. 350 W/m
How much kinetic energy does a 0.30-kg stone have if it is thrown at 44m/s
A) 290 J B) 580 J C) 440 J D) 510 J
The electric energy density in an electromagnetic wave is higher than its magnetic energy density
Indicate whether the statement is true or false
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^-23 m. c. 1.84 × 10^-14 m. d. 1.80 × 10^-13 m. e. 2 m.