Which of the following indicates the presence of high-mass stars in a region of recent star formation?
A) closely spaced low-mass stars
B) ionization nebulae
C) globular clusters
D) planetary nebulae
B) ionization nebulae
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Halley's comet has an orbital period of 76 years, what is the average distance of Comet Halley from the Sun?
a. 51 AU b. 18 AU c. 114 AU d. 660 AU e. 38 AU
Uniform Circular Motion: A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A. 0.050 m/s2 B. 1.4 m/s2 C. 48 m/s2 D. 200 m/s2 E. 0.00 m/s2
When you walk barefoot on red-hot wooden coals it is best if
A) no pieces of metal are among the coals. B) you walk slowly to demonstrate your courage. C) you impress your friends by carrying away bits of wood between your toes. D) all of the above E) none of the above
If the voltage across a resistor is tripled, the current will
a. remain the same. b. be cut to one-third. c. be cut by one-third. d. be tripled. e. be multiplied by nine.