The surface of Europa is most like the Earth's
A) Arctic Ocean.
B) Himalayan peaks.
C) tundra.
D) deserts.
E) South Pole.
A
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Interferometry
a. is used to improve the resolving power. b. decreases the chromatic aberration of a telescope. c. works only for large X-ray and ultraviolet telescopes. d. requires that radio telescopes be within a few hundred feet of each other. e. is none of the above.
A long solenoid (1 000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 mT b. 61 mT c. 43 mT d. 81 mT e. 1.4 mT
A CD has a diameter of 12.0 cm and is rotating at an angular velocity of 10.0 rad/sec. If the CD has a constant angular deceleration of -0.5 
then the angular velocity of the CD after 3.0 sec is
A. 5.7 rad/s. B. 6.2 rad/s. C. 7.9 rad/s. D. 8.5 rad/s. E. 9.8 rad/s.
What evidence do we have that Mars once had a thicker atmosphere?
What will be an ideal response?