(II) Capacitors made from piezoelectric materials are commonly used as sound transducers (“speakers”). They often require a large operating voltage. One method for providing the required voltage is to include the speaker as part of an LRC circuit as shown in Fig. 30-29, where the speaker is modeled electrically as the capacitance C = 1.0 nF. Take R = 35 Ω and L = 55 mH, ( a ) What is the resonant frequency f 0 for this circuit? ( b ) If the voltage source has peak amplitude V 0 = 2.0 V at frequency f = f 0 , find the peak voltage V C 0 across the speaker (i.e., the capacitor C ), ( c ) Determine the ratio V C 0 / V 0 . FIGURE 30–29 Problem 66.
(II) Capacitors made from piezoelectric materials are commonly used as sound transducers (“speakers”). They often require a large operating voltage. One method for providing the required voltage is to include the speaker as part of an LRC circuit as shown in Fig. 30-29, where the speaker is modeled electrically as the capacitance C = 1.0 nF. Take R = 35 Ω and L = 55 mH, ( a ) What is the resonant frequency f 0 for this circuit? ( b ) If the voltage source has peak amplitude V 0 = 2.0 V at frequency f = f 0 , find the peak voltage V C 0 across the speaker (i.e., the capacitor C ), ( c ) Determine the ratio V C 0 / V 0 . FIGURE 30–29 Problem 66.
(II) Capacitors made from piezoelectric materials are commonly used as sound transducers (“speakers”). They often require a large operating voltage. One method for providing the required voltage is to include the speaker as part of an LRC circuit as shown in Fig. 30-29, where the speaker is modeled electrically as the capacitance C = 1.0 nF. Take R = 35 Ω and L = 55 mH, (a) What is the resonant frequency f0 for this circuit? (b) If the voltage source has peak amplitude V0 = 2.0 V at frequency f = f0, find the peak voltage VC0 across the speaker (i.e., the capacitor C), (c) Determine the ratio VC0/V0.
Required information
In a standard tensile test, a steel rod of 1 3 -in. diameter is subjected to a tension force of P = 21 kips. It is given that v=
0.30 and E= 29 × 106 psi.
1-in. diameter
P
P
-8 in.
Determine the change in diameter of the rod. (Round the final answer to six decimal places.)
The change in diameter of the rod is -
in.
5.84 ... If the coefficient of static friction between a table and a uni-
form, massive rope is μs, what fraction of the rope can hang over the
edge of the table without the rope sliding?
5.97 Block A, with weight Figure P5.97
3w, slides down an inclined plane
S of slope angle 36.9° at a constant
speed while plank B, with weight
w, rests on top of A. The plank
is attached by a cord to the wall
(Fig. P5.97). (a) Draw a diagram
of all the forces acting on block
A. (b) If the coefficient of kinetic
friction is the same between A and
B and between S and A, determine
its value.
B
36.9°
Chapter 30 Solutions
Physics for Scientists and Engineers with Modern Physics
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