Galaxy A receding from Galaxy B at a velocity of 7500 km/s, from the perspective of Galaxy B. Hubble's Law says that V=H0 x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A) 5000 Mpc
B) 500,000 Mpc
C) 50000 Mpc
D) 100 Mpc
E) 1000 Mpc
Ans: D) 100 Mpc
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Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the image caused by the first lens? Give the most inclusive answer.
A. 50 cm after the first lens B. 20 cm after the second lens C. both 50 cm after the first lens and 20 cm after the second lens D. 50 cm after the second lens E. 20 cm before the second lens
____________________ formed as Mercury cooled and shrank
Fill in the blank(s) with correct word
Time Dilation: A spaceship carrying a light clock moves at a speed of 0.960c relative to an observer on Earth. If the clock on the ship advances by 1.00 s as measured by the space travelers aboard the ship, how long did that advance take as measured by the observer on Earth?
A. 0.96 s B. 1.2 s C. 2.6 s D. 3.6 s E. 5.8 s
Which of the following is a kilometer?
A) 109m B) 106m C) 1000 m D) 10-9m E) 10-6m