How did Tycho's detailed observations of Mars' brightness help show that its orbit could not be circular?
What will be an ideal response?
Tycho noted that at some oppositions, Mars was much brighter than at others, suggesting that Mars must be closer to us when it was brighter.
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What is your latitude if the north celestial pole appears on your horizon?
A) 90° N B) 90° S C) 0° D) 45° N
Charge: A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A. 1.25 × 1013 B. 1.25 × 1019 C. 2.50 × 1013 D. 2.50 × 1019 E. 3.01 × 1023
Which form of relativity applies for observers who are accelerating?
a. Special relativity applies. b. General relativity applies. c. Both special relativity and general relativity apply. d. Neither applies since the observer must be in an inertial frame to use either one.
At what angle (relative to the horizontal) should a curve 52 m in radius be banked if no friction is required to prevent the car from slipping when traveling at 10 m/s? (g = 9.8 m/s2)
a. 28° c. 16° b. 32° d. 11°