Thin Lenses: A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f.
B. between f and 2f.
C. of f.
D. that is greater than 2f.
E. of infinity.
Answer: D
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An astronaut on the Moon drops a feather and a hammer at the same time. Which hits the ground first?
A. The hammer hits first due to its larger mass. B. The feather hits first since there is no air resistance on the Moon. C. The feather hits first due to the decreased weight of the hammer. D. The feather and the hammer hit the ground at the same time.
which of the following is true about Copernicus's Model of the cosmos
a) Retrograde motion is an apparent motion which occurs when Earths passes or laps a planet such as Mars as they both orbit the Sun b) the outer planets orbit the Earth in perfect circles c)Earth is at the center of the cosmos
A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) The answer cannot be determined without knowing the densities of the blocks.
The hydrogen absorption lines are the strongest in ________ type stars.
A. A B. B C. O D. G