Thin Lenses: A thin lens projects an image of a man as shown in the figure. Rays marked A, B, and C travel to the lens from the man's ear. Draw the paths of these three rays after they have passed through the lens. Note that A is parallel to the principal axis, B goes through the center of the lens, C goes through the focal point on the left, and the point marked f is the focal point on the right of the lens.
What will be an ideal response?
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In each cycle an engine gets 50. J from the combustion of fuel and it expels 45. J of heat to the environment at 13.°C. What is the minimum possible temperature at which the 50. J could be taken in?
A) 45°C B) 33°C C) 20°C D) 27°C E) 23°C
Since Mars is 1.5 AU from the Sun, how long would it take for sunlight to reach the surface of Mars?
a. 4 min b. 8 min c. 12 min d. 1 hr e. 4 hr
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has been on its current orbit for only a short time compared to the age of our solar system. B) It came from the Oort cloud. C) It came from the Kuiper belt. D) It has a coma and tail during most of each orbit.
When an igneous rock is eroded and then becomes deposited at the bottom of an ocean it turns into
A) a metamorphic rock B) a meteorite C) another igneous rock D) a sedimentary rock