Suppose we put a 0.3-kg hunk of ice at 0°C into an insulating thermos bottle filled with 1000 g of water at 20°C. What will be the system’s final temperature?
A. Below 0°C
B. Almost exactly 0°C
C. Somewhat above 0°C, but below 10°C
D. Very roughly 10°C
E. Somewhat below 20°C, but above 10°C
F. Almost exactly 20°C
B. Almost exactly 0°C
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Pressure: A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A. 0.18 N/m2 B. 0.36 N/m2 C. 1800 N/m2 D. 3600 N/m2
Weight and g: Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?
A. The acceleration due to gravity on Planet A must be twice as great as the acceleration due to gravity on Planet B. B. The acceleration due to gravity on Planet A must be four times as great as the acceleration due to gravity on Planet B. C. The acceleration due to gravity on Planet A is the same as the acceleration due to gravity on Planet B. D. The acceleration due to gravity on Planet A is greater than the acceleration due to gravity on Planet B, but we cannot say how much greater. E. We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.
An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m, beginning in the corner of a square classroom. It then turns exactly 90 degrees to the right, and proceeds an additional 4.00 m, reaching the far corner of the same wall from which it began. If the second leg was also crawled in half the amount of time as required for the first leg, what was the ant’s average speed for the whole trip?
A. 0.80 m/s B. 0.27 m/s C. 0.37 m/s D. 0.44 m/s
Which planet (besides Earth) has been visited by the largest number of robotic spacecraft?
A) Mars B) Venus C) Jupiter D) Saturn