According to Einstein's theory of general relativity, it is impossible to perform an experiment in a local environment that will enable us to decide whether we are accelerating or in a gravitational field
Indicate whether the statement is true or false
TRUE
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A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m 
The thickness of the down comforter is 5.0 cm and the area of the comforter is 2.0 m2. If the temperature difference between inside of the comforter and the outside of the comforter 40
then what is the rate of heat flow through the comforter?
A. 10 W B. 20 W C. 30 W D. 40 W E. 50 W
Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 100 Mpc away would have a recession velocity of ____
a. 0.7 km/s b. 1.43 km/s c. 30 km/s d. 170 km/s e. 7,000 km/s
What use are 21-cm radio waves to galactic astronomers?
A) They bounce off stars like our Sun to let us precisely measure their distances. B) We can reflect them off the core of the Galaxy. C) They pick up the cool, dark matter much better than can optical telescopes. D) They cut through the dusty cocoons to let us watch star birth. E) Their Doppler shifts let us map the motions and locations of gas in the spiral arms.
An object moves 10 m east in 30 s and then returns to its starting point taking an additional 70 s. If west is chosen as the positive direction, what is the average speed of the object?
a. 0.20 m/s c. 0.50 m/s b. –0.20 m/s d. 0 m/s