What must be true about the orbit of a planet discovered by the transit method?
A) The planet must be closer to its star than Mercury is to the Sun.
B) The planet must have a face-on orbit as seen from Earth.
C) The planet must have an edge-on orbit as seen from Earth.
D) The planet's orbit must be very close to circular.
E) The planet's orbit must be very eccentric.
C) The planet must have an edge-on orbit as seen from Earth.
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Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere. B) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight. C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight. D) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight. E) It isn't: both hemispheres have the same seasons at the same time.
An empty coal-car (mass 20,000.kg) of a train coasts along at 10.m/s. An unfortunate 3000. kg elephant falls from a bridge and drops vertically into the car. Determine the speed of the car immediately after the elephant is added to its contents
What will be an ideal response?
When an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector. B) in the opposite direction of the velocity vector. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path. E) depends on the speed of the object.
What is the approximate density of a fish, compared with the density of water? Defend your answer
What will be an ideal response?