In the context of spectral classes, which of the following statements is true of T dwarfs?
A) They are a spectral class of red giant stars.
B) They are hotter than L dwarfs.
C) They are a spectral class of white giant stars.
D) They are fainter than L dwarfs.
D
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An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along a direction making a clockwise angle of 150° with the x-axis
What is the direction of the third force, measured clockwise from the x-axis? A) 164° B) 146° C) 236° D) 255° E) 262°
A car travels in an oval path as shown below
= 25 m/s, West, and 
= 20 m/s, North. The ratio of the magnitude of the centripetal acceleration at B to that at A, 
is:
?
a.
0.512
b.
0.64
c.
0.8
d.
1.25
e.
1.56
What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?
A) 5% B) 10% C) 1.5% D) 1% E) 25%
The idea that other civilizations are waiting for us to reach a certain technological level before revealing themselves to us is referred to as the
A) conspiracy hypothesis B) UFO hypothesis C) sentinel hypothesis D) zoo hypothesis