In the figure below a crowbar is used to lift a weight. If a down ward force of
ID: 1796139 • Letter: I
Question
In the figure below a crowbar is used to lift a weight. If a down ward force of 205 N is applied to the end of the bar, how much weight does the other end bear? The crowbar itself has negligible weight. (Let r1-29.0 cm and r2 _ 4.60 cm.) Suomit Answer Save Progress 125 points ColFunPhys1 10.P002 My Note An artist designs a mobile of light horizontal rods connected by vertical strings and supporting various shaped weights (see figure below). Find the magnitudes w2. w, and w4 if w- 2.35 units of weight. The numerical values given in the figure all have units of length. units of weight units of weight units of weight 30.0 30.0 30.0 10.0 20.0 10,0 WyExplanation / Answer
balancing moment about pivot point,
M = (W r2) - (F r1) = 0
W (4.60) = 205 x 29
W = 1292 N .........Ans
---------------------------------------
for w1 and w2:
M = 30 w1 - 10w2 = 0
w2 = 3 x 2.35 = 7.05 ........Ans
30 (w1 + w2) - 30 (w3 + w4)= 0
w3 + w4 = 7.05 + 2.35 = 9.4 .... (i)
and 02w3 - 10 w4 = 0
w4 = 2 w3
3 w3 = 9.4
w3 = 3.13 .........Ans
w4 = 6.27 .......Ans