An aluminum foil 0.10 mm thick has how many aluminum atoms per square cm? (The density of aluminum is 2.7 × 103 kg/ m3 and the atomic mass of aluminum is 27.)
A)
6 × 1017
B)
6 × 1020
C)
6 × 1024
D)
6 × 109
E)
6 × 1030
B
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A parallel plate capacitor has a paper dielectric having dielectric strength 8.00 kV/mm and dielectric constant 3.00. The plate area is 3000 
and the plate separation is 0.500 mm. If 10.0 V are applied to this capacitor, what is the charge on the capacitor?
A. 50.0 
C
B. 42.0 nC
C. 160 nC
D. 16.0 nC
E. 42.0 C
Vision Problems: A nearsighted person cannot see objects beyond 80 cm from his eyes. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly?
A. +80 cm, +1.3 diopters B. -80 cm, +1.3 diopters C. +80 cm, -1.3 diopters D. -80 cm, -1.3 diopters E. -1.3 cm, +1.3 diopters
When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not?
A) Yes, they appear as small, fuzzy patches on the other side of our galaxy. B) No, because there are only galaxies above and below the plane of the Milky Way. C) No, because the stars, gas, and dust of the Milky Way block us from seeing them. D) Yes, there are many other galaxies that we see inside the Milky Way.
A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2 ), at a temperature of 260 K
The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 6.8 kJ. B) 6.1 kJ. C) 7.6 kJ. D) 8.3 kJ. E) 9.1 kJ.