1) Approximately what magnitude force, F M, must the extensor muscle in the uppe
ID: 1290439 • Letter: 1
Question
1)
Approximately what magnitude force, FM, must the extensor muscle in the upper arm exert on the lower arm to hold a 7.1-kg shot put (Figure 1) ? Assume the lower arm has a mass of 2.6kg and its CG is 12cm from the elbow-joint pivot.
Express your answer to two significant figures and include the appropriate units.
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2) The gauge pressure in each of the four tires of an automobile is 220kPa .
If each tire has a "footprint" of 200cm2 (area touching the ground), determine the mass of the car.
Express your answer to two significant figures and include the appropriate units.
SubmitM
3)
How high would the level be in an alcohol barometer at a pressure of 0.92atm? The density of alcohol is 0.79
FM =Explanation / Answer
net torque = 0
M*g *L + m*g*l = Fm*x
(7.1*9.8*0.3)+(2.6*0.06)=Fm*0.025
Fm = 841.2 N
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P = F/A
F = P*A = (220*1000*200e-4) = 4.4e+3 N
m = F/g = 448.97 kg = 449 kg
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3)
dP = rho*g*h
h = dP/gh = (0.79*1000)/(9.8*0.92*1.013*100000)
h = 8.6497*10^-4 m = 8.65*10^-4 m = 0.86 mm
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