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avatar+1832 

In shaft BC he subtracted 2.4 - 1.2 

how did he know that 2.4 is in oppisote direction of 1.2 ?

 

 

physics
 Oct 24, 2015

Best Answer 

 #3
avatar+32822 
+10

Presumably the motor is driving something (imagine, for example, there are belts over the discs going off to work some machinery).  The discs are applying a force on whatever they are connected to (e.g. they are driving the belts), so, from Newton's third law, whatever is being driven is supplying a reaction force on the discs, opposing the drive.

 Oct 25, 2015
 #1
avatar
+4

Because it states that the torque of the motor is TOTAL 2.4 kN.m     Tb = DIMINISHES it by 1.2   

   Tc removes 0.8   

       and  Td diminishes it to Zero by .4  ....they all add up to the motor exerted torque 2.4

 

OK?       Got it ?     Yeah!

 Oct 25, 2015
 #2
avatar+1832 
+5

No I didn't get it . 

 

My question was how did he know that the torque exerted by the motor is in opposite direction of Tb,Tc and Td ? 

 Oct 25, 2015
 #3
avatar+32822 
+10
Best Answer

Presumably the motor is driving something (imagine, for example, there are belts over the discs going off to work some machinery).  The discs are applying a force on whatever they are connected to (e.g. they are driving the belts), so, from Newton's third law, whatever is being driven is supplying a reaction force on the discs, opposing the drive.

Alan Oct 25, 2015

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