Sometimes a flashlight filament glows red instead of white, which indicates a lowness of
A) current in the filament.
B) filament temperature.
C) both of these
D) neither of these
Answer: C
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A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. How fast can she swim in still water?
A) 0.50 m/s B) 0.80 m/s C) 1.2 m/s D) 1.4 m/s E) 1.8 m/s
We are unlikely to find fossil evidence of life from more than 3.5 billion years ago because there is no way life existed before then
Indicate whether the statement is true or false
A 5000-kg freight car crashes into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg freight car?
A) 4 m/s B) 5 m/s C) 6 m/s D) 8 m/s E) none of the above
The combining of two nuclei to form a larger nucleus with the release of energy is __________
Fill in the blank(s) with correct word