A helium balloon rises because of __________ principle
Fill in the blank(s) with correct word
Archimedes'
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Why does Mars have seasons similar to the Earth?
a. Mars is roughly the same distance from the sun as Earth. b. Mars has the same size as the Earth. c. The shape of Mars' orbit is the same as the Earth's. d. Mars' rotational axis is tilted relative to its orbit like the Earth's.
A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center
What magnitude forces do the sawhorses exert on the board?
Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?
a. 30° b. 60° c. 45° d. 53° e. 75°
If the temperature of a wire increases, its resistance
a. increases b. decreases c. does not change d. will increase or decrease depending on the composition e. will change in a way that can not be determined