A "larger" Moon on the horizon is an optical illusion
a. True
b. False
Indicate whether the statement is true or false
True
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The Oort cloud is at a distance of 500 AU from the Sun
Indicate whether the statement is true or false
Two balls have the same weight and surface texture, but one has twice the diameter of the other. How many times larger is the terminal speed of the smaller ball falling through air than that of the bigger ball?
A. The balls fall with the same speed in air. B. The smaller ball’s terminal speed is [2]1/2 times larger than the other’s. C. The smaller ball’s terminal speed is 2 times larger than the other’s. D. The smaller ball’s terminal speed is 4 times larger than the other’s. E. The smaller ball’s terminal speed is some other multiple of the other’s (specify).
A star has a parallax of 0.04 arc seconds. What is its distance?
A. 25 light-years B. 4 parsecs C. 4 light-years D. 25 parsecs
Which of the following represent reasonable order-of-magnitude estimates for your age in seconds?
1. 109 s 2. 1011 s 3. 107 s 4. 105 s