A galaxy is at a distance of one billion light years. Which of the following is true?
A) We see the galaxy the way it will be in one billion years.
B) We see the galaxy the way it was one billion years ago.
C) We see the galaxy the way it was when the universe was one billion years old.
D) We see what our galaxy will be like in one billion years.
E) We have no knowledge of anything at that distance.
B
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The resolving power for light of 550 nm of an optical telescope with a diameter of 232 cm is
a. 0.05 arc seconds. b. 232 arc seconds. c. 2.32 arc seconds. d. 5 arc seconds. e. 11.6 arc seconds.
Venus's retrograde spin is not unique among terrestrial planets.
Answer the following statement true (T) or false (F)
A circular window of 30.0 cm diameter in a submarine can withstand a maximum force of 1.88 × 106 N. What is the maximum depth to which the submarine can go without damaging the window?
A) 750 m B) 2.70 km C) 945 m D) 1.33 km E) 1.20 km
Two identical concrete slabs lie flat and in contact with each other as shown in the figure
If the temperature increases by 40°C, the lower edges opposite the contact edges remained fixed in position, and the lower edges of the contact side remain in contact, at what angle will the slabs be tilted? The coefficient of thermal expansion of the concrete is 10 × 10-6/K. A) 19° B) 0.028° C) 15° D) 1.6° E) The answer depends on the length of the slabs.