my solution -- which is apparently wrong - Edit 1
Before modification by moondog at 10/04/2011 06:51:09 AM
Tb = Torque of beam
Tp = Torque of person
T = total torque
T = Tb + Tp
Tb = (580kg) * (9.8m/s^2) * (1.7m) = 9662.8Nm
Tp = (75kg) * (9.8m/s^2) * (3.40m) = 2499Nm
T = 9662.8 + 2499 = 12161.8Nm
edit: i know this is wrong because it is from an online homework sheet which automatically tells you whether or not your answer is correct. even rounding to 3 significant figures with the above answer was not taken as correct.
Tp = Torque of person
T = total torque
T = Tb + Tp
Tb = (580kg) * (9.8m/s^2) * (1.7m) = 9662.8Nm
Tp = (75kg) * (9.8m/s^2) * (3.40m) = 2499Nm
T = 9662.8 + 2499 = 12161.8Nm
edit: i know this is wrong because it is from an online homework sheet which automatically tells you whether or not your answer is correct. even rounding to 3 significant figures with the above answer was not taken as correct.