Two electrons are separated by 7.0 cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 × 10^?31 kg, ke = 8.99 × 10^9 N/m2/C2, G = 6.67 × 10^–11 N/m2/kg2, and e = 1.6 × 10^?19 C)
a. 2.3E+2
b. 1.3E+20
c. 3.1E+22
d. 4.2E+42
e. 1
d
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As of early 2013, the number of confirmed exoplanets found was:
A) 5, all around stars within 20 light years of us. B) 42, all much bigger than Jupiter, but orbiting red dwarf stars. C) over 400, orbiting more than 300 stars. D) about 900, mainly around stars much smaller and fainter than our Sun. E) thousands, around every star we have closely examined to date.
A ship that weighs 10,000 tons (mass 10 million kg) must displace what volume of fresh water in order to float?
A) 104 m3 B) 107 m3 C) 108 m3 D) 1010 m3 E) 1012 m3
Does an electric field exert a force on a beam of moving electrons? Assume the motion of the electrons is along the x axis and field is in the y direction
1.yes 2.no
An automobile engine operates between a high temperature set by the burning of gasoline and the low temperature of the outside environment. If the engine has been running for some time, the engine is most efficient on ________ (hot or cold) days.
Fill in the blank(s) with the appropriate word(s).