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Author Question: A uniform piece of wire, 20 cm long, is bent in a right angle in the center to give it an L-shape. ... (Read 24 times)

melina_rosy

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on: Jul 29, 2018
A uniform piece of wire, 20 cm long, is bent in a right angle in the center to give it an L-shape. How far from the bend is the center of mass of the bent wire?
 
  A) 2.5 cm
  B) 3.5 cm
  C) 4.5 cm
  D) 5.0 cm
  E) 7.1 cm

Question 2

A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s.
 
  A) 68 Hz
  B) 69 Hz
  C) 70 Hz
  D) 71 Hz
  E) 72 Hz


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s.meritte

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

C


melina_rosy

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Reply 2 on: Jul 29, 2018
Excellent

coreycathey

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Reply 3 on: Yesterday
Gracias!

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