What layer of the Sun are we seeing in this photograph, and in what wavelength band was it photographed?
A) corona, photographed in x-rays
B) chromosphere, photographed in visible light
C) photosphere, photographed in visible light
D) convection zone, photographed in infrared light
E) radiation zone, photographed in x-rays
A) corona, photographed in x-rays
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What law of nature explains why the galaxy began to rotate rapidly and flatten out as it shrunk in size?
A) the law of conservation of angular momentum B) Newton's universal law of gravitation C) Newton's third law of motion D) Einstein's special theory of relativity
Two ice skaters push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s. What speed does the 60-kg skater acquire?
A) 0.500 m/s B) 0.281 m/s C) 0.375 m/s D) 0.750 m/s E) 0 m/s
A bat, flying at 7.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 52.1 kHz b. 51.1 kHz c. 50.0 kHz d. 49.0 kHz e. 48.6 kHz
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 in psi is a. 0.25. b. 0.4. c. 4. d. 10. e. 40.