Stars are born in
a. reflection nebulae.
b. dense molecular clouds.
c. HII regions.
d. the intercloud medium.
e. the local bubble.
b
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A delivery truck and a car collide. Which vehicle experiences the greater acceleration?
A. the car B. the truck C. Both the car and the truck experience the same acceleration. D. We need to know the speed of the truck and the car to find the answer. E. We need to know the mass of the truck and the car to find the answer.
A car of mass 1 000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg×m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
At 96° F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90 % when the temperature is 96°F, the humidity is
a. 10 % b. 0.9 c. 0.004 kg/m3 d. 0.036 kg/m3 e. 0.04 kg/m3