To adjust the speed of a planet, Ptolemy supposed that Earth was slightly off center and that the center of the epicycle moved such that it appeared to move at a constant rate as seen from a point called the equant
Indicate whether the statement is true or false
True
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Riddler: So how long would it take to get to the closest star (after the Sun) if you could go only as fast as a passenger jet?
A: ~5 hours. B: ~5 months. C: ~5 years. D: ~500 years! E: ~5 million years!
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that is approaching a top floor and decreasing its speed at the rate of 3 m/s every second. What would be the reading on the scale?
A. 0 N B. 150 N C. 740 N D. 640 N E. 340 N
One of the rare galaxies that is isolated in space is likely to be a(n) ____
a. starburst galaxy b. ultra luminous infrared galaxy c. dwarf galaxy d. antenna galaxy e. spiral galaxy
A circuit contains two inductors of 6.0 mH inductance in parallel placed in series with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
a. 3.0 mH b. 3.4 mH c. 4.8 mH d. 11 mH e. 20 mH