Compressions and rarefactions are characteristics of
A) longitudinal waves.
B) transverse waves.
C) both of these
D) need more information
Answer: A
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Which of the following is a property of Seyfert galaxies?
A. Their nuclei have abnormally low luminosities. B. The radiation from their cores fluctuates rapidly. C. Most are elliptical galaxies. D. They contain no gas clouds.
A level pipe contains a nonviscous, incompressible fluid with a density 1200 kg/m3 that is flowing steadily. At one position within the pipe, the pressure is 300 kPa and the speed of the flow is 20.0 m/s
At another position, the pressure is 200 kPa. What is the speed of the flow at this second position? A) 567 m/s B) 16.2 m/s C) 32.9 m/s D) 23.8 m/s E) 186 m/s
How much energy is radiated each second by one square meter of a star whose temperature is 10,000 K? Note: ? in the Stefan-Boltzmann law is equal to 
.
a.
5.67 × 1012 J
b.
5.67 × 108 J
c.
5.67 × 104 J
d.
300 nm
e.
300,000,000 nm
According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them ________
A) decreases by a factor of 3 B) decreases by a factor of 9 C) increases by a factor of 9 D) increases by a factor of 3