Weight held by a beam and cable

AI Thread Summary
A weight of 336 pounds is being held by a beam and cable at a 49-degree angle. The force of gravity was incorrectly calculated by multiplying the weight by 9.8, leading to confusion since the weight is already in force units. The tension in the cable was calculated as approximately 4363 lbf, while the force of the beam was found to be 2862.4 lbf, which was identified as incorrect. The discussion highlights the importance of recognizing that weight is already expressed in force units, eliminating the need for further conversion. Correcting this misunderstanding is essential for accurate calculations in physics.
EchoTheCat
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I've got a problem where a weight is being held to the side of a building using a beam and a cable. The weight is 336 pounds and the angle between the cable and the beam is 49 degrees. I need to calculate the tension of the cable and the force of the beam. I calculated the force of gravity as being 336*9.8 = 3292.8 lbf. If the tension in the cable is T, then sin 49 degrees = 3292.8 / T. I solved for T to be 4363.0027845 lbf. I calculated the force of the beam to be 3292.8/tan 49 degrees = 2862.4 lbf, but that's not the correct answer. I don't know what I've done wrong?
 

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The objects weight is already given in force units, not mass units. Why are you multiplying it by g? The weight of any object is always in force units in USA or SI systems of measure.
 
You're right. Thank you!
 
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