As you enter a fine restaurant, you realize that you have accidentally brought a small electronic timer from home instead of your cell phone. In frustration, you drop the timer into a side pocket of your suit coat, not realizing that the timer is operating. The arm of your chair presses the light cloth of your coat against your body at one spot. Fabric with a length L hangs freely below that spot, with the timer at the bottom. At one point during your dinner, the timer goes off and a buzzer and a vibrator turn on and off with a frequency of 1.50 Hz. It makes the hanging part of your coat swing hack and forth with remarkably large amplitude, drawing everyone’s attention. Find the value of L .
As you enter a fine restaurant, you realize that you have accidentally brought a small electronic timer from home instead of your cell phone. In frustration, you drop the timer into a side pocket of your suit coat, not realizing that the timer is operating. The arm of your chair presses the light cloth of your coat against your body at one spot. Fabric with a length L hangs freely below that spot, with the timer at the bottom. At one point during your dinner, the timer goes off and a buzzer and a vibrator turn on and off with a frequency of 1.50 Hz. It makes the hanging part of your coat swing hack and forth with remarkably large amplitude, drawing everyone’s attention. Find the value of L .
Solution Summary: The author explains the value of fabric length L and the frequency of the buzzer due to turn on and off.
As you enter a fine restaurant, you realize that you have accidentally brought a small electronic timer from home instead of your cell phone. In frustration, you drop the timer into a side pocket of your suit coat, not realizing that the timer is operating. The arm of your chair presses the light cloth of your coat against your body at one spot. Fabric with a length L hangs freely below that spot, with the timer at the bottom. At one point during your dinner, the timer goes off and a buzzer and a vibrator turn on and off with a frequency of 1.50 Hz. It makes the hanging part of your coat swing hack and forth with remarkably large amplitude, drawing everyone’s attention. Find the value of L.
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Q-3 T. Brady Problem
sy = Voy⋅ t + kayt
11
21
60f
1664/5²
W
w ½gt² + Vyt-sy = 0
at² + bt+C =0
Q-3 Hmwk #2
it the minimum average power?
13. An energy-efficient fluorescent lightbulb operating at power Pı = 28 W can produce the
same level of brightness as a conventional incandescent lightbulb operating at power P,
100 W. Lifetime of the energy-efficient bulb is T = 10000 h, and its purchase price is
B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is
B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt-
hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b)
Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you
must include both the cost of purchasing the bulbs and the cost of energy.
A closed curve encircles several conductors. The line integral around this curve
Express your answer in amperes.
IS
$B.dl 3.55x10 4 T.m.
A
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Part B
If you were to integrate around the curve in the opposite direction, what would be the value of the line integral?
Express your answer in tesla-meters.
ΑΣΦ
3.55 10 4
T.m
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