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Author Question: Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz ... (Read 72 times)

jjjetplane

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on: Jul 29, 2018
Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
 
  A) 6.9 m/s
  B) 8.4 m/s
  C) 331 m/s
  D) 347 m/s

Question 2

A 0.150-kg cart that is attached to an ideal spring with a force constant (spring constant) of 3.58 N/m undergoes simple harmonic oscillations with an amplitude of 7.50 cm. What is the total mechanical energy of the system?
 
  A) 0.0201 J
  B) 0.0101 J
  C) 0.269 J
  D) 0.134 J
  E) 0 J
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qytan

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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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jjjetplane

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Reply #2 on: Jul 29, 2018
Thank you!


qytan

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Reply #3 on: Jul 29, 2018
Always glad to help...


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