What is the hour angle of a star that is crossing your meridian right now?
A) ?6 hours
B) 0 hours
C) 6 hours
D) It depends on your latitude.
E) It depends on the right ascension of the star.
B) 0 hours
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Experienced players can throw a Frisbee so it skips off the ground (the Frisbee’s front edge actually tips upward after the Frisbee hits, enabling it to climb back into the air). If a right-handed player throws a Frisbee in the usual way, it rotates counterclockwise when viewed from above. To skip the Frisbee, which edge has to hit the ground (as seen by the thrower)? (Hint: The Frisbee’s angular momentum vector, and thus its rotation axis, changes in the direction of the external torque that the strike applies to the Frisbee.)
A. The back edge B. The front edge C. The right edge D. The left edge E. The entire rim must hit the ground simultaneously.
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be
A) zero. B) 40 N. C) 120 N. D) 360 N. E) 1080 N.
Gale Crater is the site of exploration for which Mars rover?
A) Spirit B) Opportunity C) Curiosity D) Sojourner
The radius of Earth's mantle is about
a. 870 km. b. 2900 km. c. 1050 km. d. 5800 km.