Energy in the Electric Field: What the electric energy density at a point 1.0 cm from a proton? (e = 1.6 × 10-19 C, ?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
9.2 × 10-22 J/m3
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Significant Figures: The length and width of a rectangle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these numbers and multiplying by two. Your calculator's display reads 3.462. To the correct number of significant figures, the perimeter should be written as
A. 3.5 m. B. 3.46 m. C. 3.462 m. D. 3.4620 m.
What is meant by the "habitable zone"?
A) the zone where water can be a liquid around the center of the Galaxy B) the region around each star where terrestrial planets could have liquid water on their surfaces C) the zone in which terrestrial-sized planets could form around each star D) the region in dense atmospheres like Jupiter's that water droplets could form E) the regions near the poles of Mercury where liquid water might exist
Which of these is a refinement that Niels Bohr made to the Rutherford model of the atom?
A. Electrons orbit about a dense positively charged nucleus. B. Atoms consist of negatively charged electrons and positively charged protons. C. An electron's angular momentum is quantized, but not in integral multiples of ?. D. Electrons can exist only in certain circular orbits about the nucleus.
A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?
a. 5.8 m/s b. 2.8 m/s c. 5.4 m/s d. 5.6 m/s e. 11 m/s