Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it
How far above the electron would the proton have to be? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg, melectron = 9.11 × 10-31 kg)
A) 4.6 m B) 3.7 m C) 5.1 m D) 2.3 m E) 1.5 m
C
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What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm B) 3.0 cm C) 4.0 cm D) 5.0 cm E) 6.0 cm
A(n) ______________ is manifested by the vibrating and sometimes violent movement of Earth's surface
Fill in the blank(s) with correct word
The moment of inertia about the y axis of the L-shaped figure in Problem 5.5 is:
(A) 48 in.4 (B) 56 in.4 (C) 80 in.4 (D) 96 in.4
If we photograph a person's face using dim light and an extremely short exposure time, the film will reveal
A) a spread out but very fuzzy image of the face. B) a very dim image of the face. C) only a few separated tiny spots that don't much resemble the face. D) only a few separated interference lines. E) only a single tiny spot right at the center.