E1T-MP4Problem 6.30 Problem 6.30 Part A A 490 kg piano is being lowered into pos
ID: 1785178 • Letter: E
Question
E1T-MP4Problem 6.30 Problem 6.30 Part A A 490 kg piano is being lowered into position by a crane whie twopeople steady .wth ropes puing What tension must Elen maintain in her rope to keep the piane descending at a steady speed? Express your answer to two significant figures and include the appropriate units horizontal, with 450 N of tension Ellen's rope pulls owand the right, 28 below horizontal. TValue Units My Answers Gw.u What is the tension in the main cable supporting he piano? Express your answer to twoe significant figures and include the appropriate units. T-Value Units My Answers G to Ma ssign 23 MacBook Air 30Explanation / Answer
Bob'a rope = 450 N
Let the tension in elen's rope be Te
Te*cos(28) = 450*cos(15)
Te = 450*cos(15)/(cos28)
Te = 492.3 N
(b)
T = mg + Tb*sin(15) + Te*sin(28)
T = 490*9.8 + 450*sin(15) + 492.3*sin(28)
T = 5149.59 N
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