What kind of object does a main sequence star become on first using up its core hydrogen?
A. a red giant
B. a protostar
C. a supernova
D. a planetary nebula
E. a white dwarf
Answer: A
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If we imagine the history of the universe compressed into one year, dinosaurs became extinct ________
A) about an hour ago B) about 6 months ago C) about 3 weeks ago D) yesterday morning
In the burning of wood (a common chemical reaction) mass is conserved.
A. true B. false
Suppose you lived on the Moon near the center of the face that we see from Earth. During the phase of full Moon, what phase would you see for Earth? Would it be day or night at your home?
What will be an ideal response?
A motorcycle stunt rider wants to jump a 179. m wide canyon. He arranges a ramp on one side so he will be launched pointed 30.° above the horizontal. What minimum speed will be needed to just reach the other side?
A) 35. m/s B) 30. m/s C) 40. m/s D) 25. m/s E) 45. m/s