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# FL10quiz1 - force f i To the left or to the right c What...

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ESE 351 Quiz 1 Name: 9/2/2010 Sections 1.1—1.3 a. What state variable do you need to define if you see a mass in a me- chanical system? b. Let v denote the velocity of a mass M and its reference direction points to the right. This means that the mass is moving to the right when v ( t ) > 0 and that it is moving to the left when v ( t ) < 0. Let f i denote the inertial force generated by the mass due to a change in its velocity. Note that this force is an internal force of the mass and it will be generated as soon as there is a change in its velocity. Which way does the inertial force f i works when the mass is accelerating: d dt v ( t ) > 0? In other works, which direction is the reference direction for the inertial
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Unformatted text preview: force f i ? To the left or to the right? c. What state variable do you need to deﬁne if you see an inductor with inductance L in an electrical circuit? d. Let v denote the voltage across a capacitor with capacitance C and let i denote the current through the capacitor. What is the equation these three quantities must satisfy? e. What name is given to the law which states that the algebraic sum of all the voltages along a loop in an electric circuit is zero? Recall that the algebraic sum means that any voltage whose direction is against the loop direction must be subtracted from the sum instead of added to the sum....
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