Which of the following most likely explains why Venus does not have a global magnetic field like Earth?
A) Its rotation is too slow.
B) It does not have a metallic core.
C) Unlike Earth, Venus does not have a liquid outer core.
D) It has too thick of an atmosphere.
A) Its rotation is too slow.
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A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?
A) It took less time to rise than to fall. B) To compare rise and fall times we need to know the mass of the ball. C) It took the same time to rise as it took to fall. D) It took longer to rise than to fall.
Why are collisions between galaxies common, but collisions between stars rare?
A) Stars are very small compared to the distances between them, but galaxies are not. B) Stars repel each other with stellar winds, but galaxies do not. C) Stars are much less common than galaxies, so there are fewer of them to collide. D) Stars do not survive as long as galaxies, so they have less time to collide.
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 × 10-5 T B) 2.0 × 10-5 T C) 3.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T
An icy leftover planetesimal orbiting the Sun is
A) a comet. B) a meteor. C) an asteroid. D) a meteorite. E) possibly any of the above