Of the following heat engines, which has the highest efficiency?
a. Hero's engine
b. a Carnot engine
c. a car's gasoline engine
d. a truck's diesel engine
b
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In a relay race, runner A is carrying the baton and has a speed of 2.8 m/s. When he is 25 m behind the starting line, runner B starts from rest and accelerates at 0.080 m/s2. How fast is B traveling when A overtakes her?
A) 0.10 m/s B) 0.33 m/s C) 0.84 m/s D) 2.0 m/s E) Runner A never catches up.
The most recent ice age ended
A) about 1000 years ago. B) about 10,000 years ago. C) about 100,000 years ago. D) about one million years ago. E) hundreds of millions of years ago.
Which of the following statements best describes the idea behind the Gas Chromatograph/Mass Spectrometer Experiment on board the Viking landers?
A) soil with living organisms in it should contain organic molecules B) radioactive gases should be produced when radioactive nutrients are added to a soil sample C) living organisms in the soil should incorporate carbon from atmospheric gases D) living organisms in the soil should give off gases when they metabolize nutrients
What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth's radius?
A) 580 N B) 290 N C) 1160 N D) 118 N E) 1200 N