The number of stars in the Milky Way Galaxy is approximately ________
A) a few hundred million B) a few hundred billion
C) a few hundred D) a few hundred thousand
B
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What is the phase of the Moon shown in the above image?
a. third quarter
b. first quarter
c. waxing gibbous
d. waning gibbous
Neptune was discovered due to irregularities in Uranus' orbit. At closest approach, these two planets are about 10 AU apart
a) What is the force of gravity between these two objects? b) How does that compare to the force of gravity between the Sun and Uranus (approximately 20 AU from the Sun)?
A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed?
a. real, inverted, diminished b. real, inverted, enlarged c. virtual, upright, diminished d. real, inverted, of equal size
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s. b. 6.1 × 10^4 N s. c. 8.0 × 10^4 N s. d. 5.0 × 10^5 N s. e. 6.0 × 10^5 N s.