When 1.0-µC point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 µN. What is the magnitude of the second charge? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 25 C B) 25 nC C) 0.025 C D) 1.0 C E) 10 nC
B
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Equilibrium: A child is trying to stack two uniform bricks, each 24 cm long, so they will protrude as far as possible over the edge of a table without tipping over, as shown in the figure. What is the maximum possible overhang distance d?
A. 10 cm B. 12 cm C. 14 cm D. 16 cm E. 18 cm
The most easily visible supernova remnant is the _______________ Nebula
Fill in the blank(s) with correct word
Why are telescopes sometimes called "time machines"?
A) because the author, H.G. Wells, used the term to describe telescopes in a book B) because some of the oldest telescopes are still in use today C) because observations of distant objects reveal them as they were in the past D) because astronomers can use telescopes to see the Milky Way as it was when it was much younger E) It's a journalistic misnomer: you cannot travel into the past or the future.
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years