General Questions: A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A. more than 700 N
B. less than 700 N
C. 700 N
D. It could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.
Answer: B
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What is the self-inductance of a solenoid 30.0 cm long having 100 turns of wire and a cross-sectional area of 1.00 × 10-4 m2? (?0 = 4? × 10-7 T ? m/A)
A) 4.19 µH B) 4.19 nH C) 4.19 mH D) 4.19 H E) 4.19 pH
Thin Films: A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?
A. 100 nm B. 200 nm C. 300 nm D. 400 nm E. 500 nm
Waves from two slits S and Q will destructively interfere and cancel at a point P if the distance between P and S is larger than the distance between P and Q by
A. ?
B. n? (where n is an integer)
C. n? (where n is an integer)
D. (n + 
)? (where n is an integer)
E. Other (specify)