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In the previous example, calculate the magnitude of the tension in the cord. |
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Answer» Solution :Since the magnitude of a has been determined, we can use either of the TWO ORIGINAL equations to calculate `F_(T)`. Using equation (2), `Mg- F_(T)=Ma` (because it's simpler), we find `F_(T)=Mg-Ma=Mg-M. (3)/(4)g=(1)/(4)Mg=(1)/(4)(10)(10)=25 N` As you can see, we WOULD have found the same answer if we'd used equation (1) : `F_(T)-F_(f)=ma IMPLIES F_(T)=F_(f)+ma= MU mg+ma= mu mg+m. (3)/(4)g= mg(mu +(3)/(4)) = (2)10(0.5+0.75)= 25 N` |
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