Harlow Shapley found the visible disk of the Galaxy is about ________ kpc across
A) 8 B) 30 C) 8,000 D) 10,000 E) 30,000
B
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A few collisions and mergers could leave a galaxy with no gas and dust from which to make new stars
Indicate whether the statement is true or false
The jet stream is a result of the Coriolis effect.
Answer the following statement true (T) or false (F)
The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10-23 J/K
A) 2.13 × 10-25 kg B) 2.45 × 10-25 kg C) 5.66 × 10-25 kg D) 1.78 × 10-25 kg E) 3.11 × 10-25 kg
A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher. If the catcher "gives" with the ball for a distance of 0.755 m while catching it, what average force is exerted on the mitt by the ball? (g = 9.80 m/s2)
a. 39.7 N b. 294 N c. 389 N d. 399 N e. 1110 N