Coulomb's Law: Two point charges q = -8.50 µC are fixed 10.0 cm apart along a horizontal bar, as shown in the figure. Their electrical forces will be used to balance the weight of a very small sphere carrying a charge Q = + 15.0 ?C, 10.0 cm from each of them in a place where g = 9.80 m/s2. What is the greatest mass M this sphere can have without falling? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
20.3 kg
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Molecular Speeds: At what temperature is the rms speed of hydrogen molecules, H2, which have a molecular weight of 2.02 g/mole, equal to 2.0 km/s? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol.
A. 17°C B. 34°C C. 51°C D. 68°C E. 72°C
Which of the following is a reason why the Ptolemaic model was the accepted model of the Universe?
A) It was a very good predictor of planet positions. B) The authority of Aristotle was immense. C) It proved that the Sun was at the center of the Universe. D) The multiple revisions to the model made it completely accurate.
Valles Marineris is a
A) large valley on the Moon. B) vast plain on Mars. C) huge series of cliffs on Mercury. D) large canyon on Mars. E) large canyon on Venus.
If 10 J of work is used in pushing 1 C of charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V. B) 10 V. C) more then 10 V. D) none of the above