Gasoline yields 4.8 107 joules per kg when burned. The density of gasoline is approximately the same as that of water, and 1 gal = 3.8 L. How much energy does your car use on a trip of 100 mi if you get 25 mi per gallon?
What will be an ideal response?
Question 2What is the change in entropy when 50. g of ice melt at 0C?
What will be an ideal response?
Question 3In the simplified Drake equation, a value of flife = 1 would imply that
A) there is one other habitable planet in the galaxy
B) all habitable planets in the galaxy have life
C) there is one other habitable planet in the galaxy with life on it now
D) all habitable planets in the galaxy have life on them now
Question 4The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years
B) is higher than it has been at any time during the Earth's history
C) has remained roughly constant during the last 800,000 years
D) is lower than it has been at any time during the last 800,000 years
Question 5A spring-driven dart gun propels a 10. g dart. It is cocked by exerting a force of 20. N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?
What will be an ideal response?
Question 6As more resistors are added in series to a constant voltage source (zero internal resistance), the power supplied by the source
A) does not change.
B) decreases.
C) increases.
D) increases for a time and then starts to decrease.
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