physics A hair dryer draws 6.5A when plugged into a 120-V line. What is its resi
ID: 2110902 • Letter: P
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physics
A hair dryer draws 6.5A when plugged into a 120-V line. What is its resistance? How much charge passes through it in 10min ? (Assume direct current.) A hair dryer draws 6.5A when plugged into a 120-V line. What is its resistance? How much charge passes through it in 10min ? (Assume direct current.) To review the concept of conservative forces and to understand that electrostatic forces are, in fact, conservative. As you may recall from mechanics, some forces have a very special property, namely, that the work done on an object does not depend on the object's trajectory; rather, it depends only on the initial and the final positions of the object. Such forces are called conservative forces. If only conservative forces act within a closed system, the total amount of mechanical energy is conserved within the system (hence the term "conservative"). Such forces have a number of properties that simplify the solution of many problems. In this problem, you will be asked to use the given diagram(Figure 1) to calculate the work done by the electric field on a particle of charge q and see for yourself whether that work appears to be trajectory-independent. Recall that the force acting on a charged particle in an electric field is given by . Recall that the work W done on an object by a constant force is where F is the magnitude of the force acting on the object, d is the magnitude of the displacement that the object undergoes, and is the angle between the vectors and Consider a uniform electric field and a rectangle ABCD, as shown in the figure. Sides AB and CD are parallel to and have length L: let a be angle BAC. Calculate the work WAB done by the electrostatic force on a particle of charge q as it moves from A to B. Calculate the work WBC done by the electrostatic force on the charged particle as it moves from B to C. Calculate the total amount of work WABC done the electrostatic force on the charged particle as it moves from A to B to C.Explanation / Answer
6) R = 120/6.5 = 18.46 O..... q = 6.5*10*60 = 3900 C
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