Compared to a chemical rocket, an ion engine has a
A) smaller thrust but can be operated for a longer time period
B) smaller thrust and can only be operated for a shorter time period
C) larger thrust and can be operated for a longer time period
D) larger thrust but can only be operated for a shorter time period
A
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A telescope has an angular magnification of 250 when used with a 20 mm eyepiece. What is the focal length of the objective lens?
A) 5.0 cm B) 25 m C) 5000 cm D) 5.0 m E) 2.5 m
Which travels fastest in a vacuum?
A) radio waves B) light C) X-rays D) all the same
The planet with the largest diameter is
a) Earth. b) Jupiter. c) Mars. d) Neptune.
Describe what usually happens to a hot solution that is saturated with a solid as it cools
A) The solid that is dissolved comes out of the solution completely. B) The solid stays in the solution. C) Some of the solid comes out of the solution. D) The solution freezes. E) The solution solidifies.