What kind of gas is most affected by thermal escape?
A. greenhouse gases
B. light gases
C. all gases equally
Ans: B. light gases
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A miniature spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 7.00 g, and the gun and puck have a combined mass of 150 g. With the system initially at rest, the radio controlled trigger releases the bullet causing the puck and empty gun to move with a speed of 0.530 m/s. What is the bullet's speed?
a. 83.2 m/s b. 75.7 m/s c. 12.4 m/s d. 11.4 m/s e. 296 m/s
A proposed explanation for gamma-ray bursters is
A) hypernova-making black holes and bipolar jets. B) coalescence of a neutron star binary. C) collisions between two white dwarfs. D) Both A and B are possible. E) All three are possible.
The Sun orbits the center of the galaxy about once every ____
a. 200,000 years b. 2,000,000 years c. 20,000,000 years d. 200,000,000 years e. 2,000,000,000 years
This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. During which stage is the star's energy supplied primarily by gravitational contraction?
A) Stage ii B) Stage iii C) Stage v D) Stage vi E) Stage viii