A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the magnitude of the net force on the ball?
A)
0 N
B)
20 N
C)
40 N
D)
50 N
E)
100 N
E
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The Burger’s vector in ionic materials is larger than in elemental metals, because the Burger’s vector must connect two _____________points.
Fill in the blank(s) with the appropriate word(s).
This image shows two tall volcanoes on Venus. Why is it yellow?
A) The yellow color is arbitrary because this image was created with radar data rather than visible light. B) Lava from volcanoes on Venus is yellow rather than the red of lava on Earth. C) The camera used to take this photograph had a yellow filter on it. D) Venus is yellow all over, apparently as a result of some sort of sulfurous dust that coats its surface.
What does Einstein's cosmological constant have to do with dark energy?
A: It is the cause of gravity. B: It may ultimately stop the expansion of the universe. C: It is a measure of the dark energy density that fills empty space. D: It causes the expansion of the universe which dark energy opposes. E: It has nothing to do with dark energy.
A mixture of cyan and yellow pigments appears
A) orange. B) green. C) magenta. D) blue. E) blackish-brown.