Solve the problem.The resistance R of a circuit containing two resistors in parallel is 
= 
+ 
, where the two resistors have resistances R1 and R2. For resistors with R1 = 190 ± 0.4 ohm and 
approximate the error in R.
A. 0.8
B. 1.0
C. 0.3
D. -0.2
Answer: C
Mathematics
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Calculate the circulation of the field F around the closed curve C.F = x3y2i + x3y2j; curve C is the counterclockwise path around the rectangle with vertices at 
, and 
A. 0 B. - 9 C. -108 D. 153
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A. 16.8 B. 1.56 C. 2.16 D. 3.36
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Express the sum or difference as a product.sin 2x - sin 4x
A. 2 sin 3x cos x B. 2 cos 2x cos 3x C. -2 sin x cos 3x D. -2 sin x
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Solve the problem.A vibrating wire has a vertical displacement given by 
Assume b and t are constants. Write y as a cosine function of x.
A. y = 8 cos(2?x + bt) B. y = 4 cos(2?x - bt) C. y = cos(2?x - bt) D. y = 4 cos(2?x + bt)
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