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MFlood7356
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1. Figure 7-30 shows an overhead view of three horizontal forces acting on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F1 = 2.28 N, F2 = 4.54 N, and F3 = 8.24 N, and the indicated angles are θ2 = 51.6° and θ3 = 35.8°. What is the net work done on the canister by the three forces during the first 2.70 m of displacement?
2. W=Fdcostheta
Wnet=W1+W2+w3
3. I really thought this was an extremely easy problem to do but apparently not. Here's my attempt. Could someone please tell me what I did wrong?
W1=(2.28)(2.70)cos0=-6.156J
W2=(4.54)(2.70)cos51.6=-7.614J
W3=(8.24)(2.70)cos35.8=18.045J
Wnet=(18.045)+(-6.156)+(-7.614)= 4.28J
2. W=Fdcostheta
Wnet=W1+W2+w3
3. I really thought this was an extremely easy problem to do but apparently not. Here's my attempt. Could someone please tell me what I did wrong?
W1=(2.28)(2.70)cos0=-6.156J
W2=(4.54)(2.70)cos51.6=-7.614J
W3=(8.24)(2.70)cos35.8=18.045J
Wnet=(18.045)+(-6.156)+(-7.614)= 4.28J