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Author Question: A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound ... (Read 65 times)

jlmhmf

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on: Jul 29, 2018
A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
 
  A) 0 Hz
  B) 82 HZ
  C) 166 Hz
  D) 249 Hz

Question 2

A very light ideal spring stretches by when it is used to hang a 135-N object.
 
  What is the weight of a piece of electronic equipment that would stretch the spring by if you hung the equipment using the spring?
  A) 289 N
  B) 63 N
  C) 176 N
  D) 405 N
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nguyenhoanhat

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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jlmhmf

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Reply 2 on: Jul 29, 2018
:D TYSM

daiying98

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Reply 3 on: Yesterday
Wow, this really help

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