Recent content by Rushers

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    What is the difference between an analog signal and alternating current?

    An alternating current is an analogue signal. An analogue signal is a signal which can take a whole range of values within a certain range. For example, i(t) = I sin(2pit) takes all the values between -I and I so it's analogue. An alternating current is a current which alternates...
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    Control and Feedback in electronic circuits

    I'm trying to understand the concept of a control system in electronics. In a control system, we have a substractor, forward path and feedback path. The forward path is described by a function g ( a gain function ) and the feedback by another function ( gain again ). The input is Xi and the...
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    System of forces and torque on an object

    Thank you for your help mate ! My Mechanics exam is in two days.
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    System of forces and torque on an object

    Using your advice, I found 50 Newtons so it's answer C. Can you check if possible?
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    System of forces and torque on an object

    I could of course write an expression of static equilibirum. Sum of all moments is zero and sum of all forces is zero. BUT How can I transform N into a force? It is a momentum, not really a force. And what is the realtionship between R and T? And if T was a torque, why isn't it applied in the...
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    System of forces and torque on an object

    http://imageshack.us/photo/my-images/121/helperw.png/ Have a look at this picture. It contains my problem. I don't really know how to differentiate torques, momentums and forces. I attempted to do as follows : Get the moment of N ( N*e, with e being a unit vector pointing upwards) Get...