How have we been able to construct detailed maps of surface features on Venus?
A) by studying Venus from Earth with powerful telescopes
B) by making computer models of geological processes on Venus
C) by using radar from spacecraft that were sent to orbit Venus
D) by landing spacecraft on the surface for close-up study
E) by studying Venus with powerful telescopes on spacecraft that were sent to orbit Venus
C
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A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0. The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
A. 0.25 m/s2 B. 0.50 m/s2 C. 0.14 m/s2 D. 0.34 m/s2 E. 0.20 m/s2
How can astronomers determine the mass of the Sun?
What will be an ideal response?
The Greenland ice sheet can be one km thick. Estimate the pressure underneath the ice. (The density of ice is 918 kg/m3.)
a. 9.0 × 10^5 Pa (9 atm)
b. 2.5 × 10^6 Pa (25 atm)
c. 4.5 × 10^6 Pa (45 atm)
d. 9.0 × 10^6 Pa (90 atm)
Weight can be simulated in a space vehicle if the vehicle is
A) falling. B) in a circular orbit about Earth. C) rotating. D) none of the above