21bw08mt2bsolns

# 21bw08mt2bsolns - MAT 21B Midterm IIb Name Student Id...

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Unformatted text preview: MAT 21B Midterm IIb Name: Student Id: Section: No notes. No calculators. All incidents of cheating or the appearance thereof will be brought to the attention of Student Judicial Affairs. 1) 2) 3) 4) 5) Total (out of 50): 1 1) (True/False) Label the following statements as either true or false. (No explanation required. Each correct label is worth two points.) a: sec (2 x ) = 2 sec ( x ) False. sec (2 π ) = 1 cos(2 π ) = 1 1 negationslash = 2 1 ( − 1) = 2 1 cos( π ) = 2 sec( π ) b: The center of mass of a square plate of constant density is the midpoint of the plate True. Because the plate is symmetric, and the density is constant, the center of mass is at the midpoint. c: integraldisplay 4 2 dx xlnx = ln 4 − ln 2 True. Let u = ln x . Then du = 1 x dx , so integraldisplay 4 2 dx xlnx = integraldisplay u =ln 4 u =ln 2 1 u du = ln u | u =ln 4 u =ln 2 = ln(ln 4) − ln(ln 2) = ln parenleftBigg ln 4 ln 2 parenrightBigg = ln ln 2 2 ln 2 = ln parenleftBigg 2 ln 2 ln 2 parenrightBigg = ln 2 And, ln 4 − ln 2 = ln 2 2 − ln 2 = 2 ln 2 − ln 2 = ln 2 2 d: Solids with equal altitudes and identical cross-sectional...
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21bw08mt2bsolns - MAT 21B Midterm IIb Name Student Id...

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