A young blue star moving along a circular orbit in the disk is a
A. Pop I star.
B. Pop II star.
C. Pop III star.
D. Pop V star.
Answer: A
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Which of the following masses separates low mass stars from high mass stars?
A) about 50 solar masses B) about 1 solar mass C) about 2 solar masses D) about 150 solar masses E) about 0.08 solar masses
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^?23 m. c. 1.84 × 10^?14 m. d. 1.80 × 10^?13 m. e. 2 m.
A car wash nozzle directs a steady stream of water at 1.5 kg/s, with a speed of 20 m/s, against a car window. What force does the water exert on the glass? Assume the water does not splash back
a. 30 N c. 300 N b. 45 N d. 440 N
The geographical area that contributes groundwater and runoff to any particular stream is called the ?
What will be an ideal response?