A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first?
A) ring
B) disk
C) sphere
D) all reach the bottom at the same time
E) need more information
Answer: C
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When learning about light, we predicted that Venus should have a temperature of 250 K based on its albedo and distance from the Sun. Why is Venus's observed average surface temperature equal to 740 K, which is hot enough to melt lead?
a. Venus has slow, retrograde rotation, and its seasons are very long. b. Venus has many active volcanoes that release heat into its atmosphere. c. Venus has a very thin atmosphere, and more sunlight falls onto its surface. d. Venus has a strong greenhouse effect. e. Venus has a highly eccentric orbit and is sometimes much closer to the Sun than other times.
The focal length of a converging lens is 10 cm. What is the magnification of this lens if the image is viewed by a relaxed eye with a near point of 25 cm?
A) 0.5 B) 1.5 C) 2.5 D) 3.5 E) 4.5
A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect
Which of the following statements is correct?
a. You only need to know the amount of thermal energy a body contains to calculate its temperature. b. The temperature of a body is directly proportional to the amount of work the body has performed. c. The quantity of thermal energy exchanged by two bodies in contact is inversely proportional to the difference in their temperatures. d. The quantity of thermal energy exchanged by two bodies in contact is directly proportional to the difference in their temperatures. e. Different amounts of thermal energy are transferred between two bodies in contact if different temperature scales are used to measure the temperature difference between the bodies.