A__________is a small, dark cloud only about 1 ly in diameter that contains 10 to 1000 solar masses of gas and dust, thought to be related to star formation
A) Herbig-Haro object
B) brown dwarf
C) Bok globule
D) T Tauri star
C
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A big defensive lineman picks up a fumbled football and begins rumbling toward the end zone. His mass is 150 kg, and his velocity is 6.0 m/s, west. A brave wide receiver, whose mass is 90 kg, must stop that lineman and he is right in the lineman's path, so it has to be a head-on collision. How fast must the wide receiver be running if he wants to drop the lineman in his tracks and save the day?
A. 88 mph B. 10 m/s C. 0.60 m/s D. 8.3 m/s
Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive substance B. If substance B has a half-life of 4 h, what's the half-life of substance A?
1.8 h 2.4 h 3.2 h
An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 12.0 s. What distance does the car travel?
a. 150 m c. 360 m b. 180 m d. 750 m
Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there. b. The temperature is the hottest in the center. c. The density of material is very high in the center. d. Both (b) and (c) e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.