PHYSICS 1 ******PLEASE ANSWER AS MANY QUESTIONS AS POSSIBLE. I ONLY HAVE 5 QUEST

Question

PHYSICS 1

******PLEASE ANSWER AS MANY QUESTIONS AS POSSIBLE. I ONLY HAVE 5 QUESTIONS LEFT THIS MONTH.

PLEASE PROVIDE DETAILED SOLUTIONS AND EXPLANATIONS TO AS MANY QUESTIONS AS POSSIBLE.

CHAPTER 16 LECTURE REVIEW

9) Calculate the wave velocity of the ocean wave if the distance between wave crests is 10.0 m and the time fora sea gull to bob up and down is 5.00 s.

10) The wave intensity I is power per unit area: I = P/A. The average intensity of sunlight on Earth’s surface is about 700 W/m^(2).

(a) Calculate the amount of energy that falls on a solar collector having an area of 0.500 m^(2) in 4.00 h.

(b) What intensity would such sunlight have if concentrated by a magnifying glass onto an area 200 times smaller

than its own?

11) Piano tuners use beats routinely in their work. When comparing a note with a tuning fork, they listen for beats and adjust the string until the beats go away (to zero frequency). If a tuning fork has a 256 Hz frequency and two beats per second are heard,what is the piano note frequency?

12) Consider a string of L = 2.00 m attached to an adjustable-frequency string vibrator as shown. The waves produced by the vibrator travel down the string and are reflected by the fixed boundary condition at the pulley. The string, which has a linear mass density of = 0.006 kg/m, is passed over a frictionless pulley of a negligible mass, and the tension is provided by a 2.00-kg hanging mass. (a) What is the velocity of the waves on the string? (b) List the frequencies that the string vibrator must be tuned to in order to produce the first three normal modes of the standing waves.

CHAPTER 17 LECTURE REVIEW

13) Calculate the wavelengths of sounds at the extremes of the audible range, 20 and 20,000 Hz, in 30.0°C air. (Assume that the frequency values are accurate to two significant figures).

14) Each factor of 10 in sound intensity corresponds to 10 dB increase. For example, a 90 dB sound compared with a 60 dB sound is 30 dB greater, or three factors of 10 (that is,103 times) as intense. Another example is that if one sound is 107 as intense as another, it is 70 dB higher. Show that if one sound is twice as intense as another, it hasa sound level about 3 dB higher.

15) Two speakers are separated by 5.00 m and are being driven by a signal generator at an unknown frequency. A student with a sound-level meter walks out 6.00 m and down 2.00 m, and finds the first minimum intensity, as shown below. What is the frequency supplied by the signal generator? Assume the wave speed of sound is v = 343.00 m/s.

16) What length should a tube closed at one end have on a day when the air temperature, is 22.0ºC, if its fundamental frequency is to be 128 Hz (C below middle C)?
What is the frequency of its fourth overtone?

17) Suppose a train that has a 150-Hz horn is moving at 35.0 m/sin still air on a day when the speed of sound is 340 m/s.

(a) What frequencies are observed by a stationary person at the side of the tracks as the train approaches and after it passes?

(b) What frequency is observed by the train’s engineer traveling on the train?

PLEASE NEED ANSWERS ASAP!!!

Explanation / Answer

9)velocity will be:

v = lambda/t = 10/5 = 2 m/s

Hence, v = 2 m/s

10)(A)we know that,

I = P/A

P = I A = 700 x 3.14 x 0.5^2 = 549.5 W

P = E/t => E = P x t

E = 549.5 x 4 x 60 x 60 = 7.913 x 10^6 J

Hence, E = 7.913 x 10^6 J

(b)I' = 200 I

I' = 200 x 700 = 1.4 x 10^5 W/m^2

HEnce, I' = 1.4 x 10^5 W/m^2

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