The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective lens of diameter of 1.02 m
Suppose such an instrument were mounted on a satellite at an elevation of 300 km above the ground and used to map surface details. If the telescope is forming images with light of wavelength 550 nm, what is the minimum separation of two objects on the ground whose separation could be clearly resolved by this lens?
19.7 cm
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If you were on the sidewalk looking at a bicyclist ride down the street, how does she look to you while riding, compared to when she stops? A) taller, the same mass, but stretched out like a limousine B) shorter, the same mass, but stretched out like a limousine C) same height, greater mass, and flatter in the direction she is moving D) same height, smaller mass, and flatter in the direction she is moving E) shorter, greater mass, but stretched out like a limousine
On a floodplain, the sediment grains away from the main river channel are
A) coarse-grained sand and gravels. B) fine-grained silts and clays. C) well-sorted and well-rounded sand particles. D) all of these
How would you explain the average density of an asteroid being about 2 g/cm3, if the density of rock is usually around 3 g/cm3?
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The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in
A) sustainability of charge flow. B) duration of charge flow. C) amount of energy transferred. D) all of the above E) none of the above