All the statements below are true. Which one gives the primary reason why the surface of Venus today is some 450°C hotter than the surface of Earth?
A) Venus has a much stronger greenhouse effect than Earth.
B) Venus is only about 73% as far from the Sun as Earth.
C) Venus has a much higher reflectivity than Earth.
D) Venus has a higher atmospheric pressure than Earth.
A
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Which method does the Kepler space telescope use to detect extrasolar planets?
a. Doppler method b. microlensing method c. wobble method d. transit method e. astrometric method
On the surface of which moon of Saturn are liquids observed to exist?
A) Enceladus B) Mimas C) Iapetus D) Titan
A solid disk and a hollow disk with the same mass and diameter are released together (from rest) to roll down an incline. The solid disk reaches the bottom first. From this information we can say that the angular acceleration was
A. the same for both disks. B. larger for the hollow disk. C. larger for the solid disk. D. impossible to know without a measurement of time.
Three resistors with values R1, R2, and R3, respectively, are connected in parallel. Which of the following expresses the total resistance, RT, of the three resistors when connected in parallel?
a. RT = (1/R1 + 1/R2 + 1/R3) c. RT = R1 + R2 + R3 b. RT = R1 = R2 = R3 d. RT = (1/R1 + 1/R2 + 1/R3)-1