We have sent several spacecraft on trajectories that will ultimately take them into interstellar space (Pioneer 10 and 11, Voyager 1 and 2, New Horizons). How long will it take these spacecraft to travel as far as the nearest stars?
A) a few hundred years
B) tens of thousands of years
C) a few decades
D) about a thousand years
E) never, because they will rust and fall apart
B
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An acid added to a base will produce a
a. salt and hydrogen ions. b. salt and hydroxide ions. c. salt and water. d. stronger acid and base.
Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?
A) winter B) spring C) summer D) fall
About 540 million years ago, a sudden increase in biological complexity occurred, known as the _______________
Fill in the blank(s) with correct word
When a 2.75-kg fan, having blades 18.5 cm long, is turned off, its angular speed decreases uniformly from 10.0 rad/s to 6.30 rad/s in 5.00 s
(a) What is the magnitude of the angular acceleration of the fan? (b) Through what angle (in degrees) does it turn while it is slowing down during the 5.00 s? (c) If its angular acceleration does not change, how long after it is turned off does it take the fan to stop.