Suppose you view the solar system from high above Earth's North Pole. Which of the following statements about planetary orbits will be true?
A) All the planets orbit counterclockwise around the Sun.
B) The inner planets orbit the Sun clockwise while the outer planets orbit the Sun counterclockwise.
C) All the planets except Uranus orbit the Sun counterclockwise; Uranus orbits in the opposite direction.
D) The inner planets orbit the Sun counterclockwise while the outer planets orbit the Sun clockwise.
A
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A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above
Half-frozen fruit punch is always sweeter than the same fruit punch completely melted because
A) the sugar sinks to the bottom. B) crystallization is a purifying process. C) the half-frozen fruit punch is warmer. D) sugar molecules are less soluble in a half-frozen solution.
Velma and Mort pass each other, in rocket ships, at a relative velocity of half of lightspeed. Velma has an ice cream cone which will melt in 5 minutes if not refrigerated. She removes her cone from the refrigerator, and allows it to melt
According to Mort, how long does it take for Velma's cone to melt? A) more than 5 minutes B) less than 5 minutes C) 5 minutes D) It could be either more than 5 minutes, or 5 minutes, depending on which observer is at rest. E) It is impossible to answer this question, because such measurements of moving objects have no precise meaning.
What does it mean for a physical quantity in a system to be conserved?
a. It is used in the most efficient manner possible. b. It stays in its original state forever. c. The total amount of it in the system stays constant. d. none of the above.