Which of the following is fundamentally different from the others?
A) sound waves
B) X-rays
C) gamma rays
D) light waves
E) radio waves
Answer: A
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On a graph of luminosity versus color for galaxies, shown below, many galaxies form a clump known as the "blue cloud." Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that indicate active star formation. B) They are moving slower than galaxies in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black. E) They are all moving toward us, causing them to be blueshifted.
From the center of the Milky Way, 10- kpc-long magnetized jets of high-energy particles are emitted
Indicate whether the statement is true or false
Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be _____________ the reading on a pressure gauge connected to the pipe at point B
a. the same as b. higher than c. lower than d. unrelated to
A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it
a. 0.41 N / m b. 0.14 N / m c. 0.38 N / m d. 0.27 N / m e. 0.77 N / m