Which of the following primarily determines the resolution of a telescope?
a. the diameter of the eyepiece
c. the focal length of the objective
b. the diameter of the objective
d. the barrel length
B
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_____ is the nearest star to the Sun
A) Polaris B) Proxima Centauri C) Sirius D) Alpha Centauri
How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material.
B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material.
C) Asteroids are made of icy material and are denser than the comets, which are more rocky.
D) Asteroids are made of icy material and are less dense than the comets, which are rockier.
E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.
Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm B) 20 N/m C) 200 N/m D) 2000 N/cm E) 0.0020 N/m
A 100-? resistor is connected in series with a 10.0-mH inductor across an ac source operating at 1.00 kHz. What is the impedance of this circuit?
A) 100 ? B) 200 ? C) 1000 ? D) 236 ? E) 118 ?