In the context of life in the universe, which of the following discoveries of astronomy suggests that there has been plenty of time for life to have appeared and evolved elsewhere?
A) the universe is very large
B) the universe is very old
C) the laws of physics are the same everywhere
D) the building blocks of life are common
B
Physics & Space Science
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A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
a. 20 b. 30 c. 40 d. 10 e. 50
Physics & Space Science
The creation of elements inside a star is called ______________
Fill in the blank(s) with correct word
Physics & Space Science
Suppose you are in an elevator that is traveling upward at constant speed. How does your weight compare to your normal weight on the ground?
A) It is the same. B) You are weightless. C) It is less. D) It is greater.
Physics & Space Science
Neutral hydrogen clouds appear ________ when viewed visually
Fill in the blank(s) with correct word
Physics & Space Science