This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches ... (Read 39 times)

asmith134

  • Hero Member
  • *****
  • Posts: 576
on: Jul 27, 2018
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
 
  A) 200 Hz
  B) 375 Hz
  C) 400 Hz
  D) 425 Hz
  E) 450 Hz

Question 2

What length of copper wire (resistivity 1.68  10-8 m) of diameter 0.15 mm is needed for a total resistance of 15 ?
 
  A) 16 mm
  B) 16 cm
  C) 1.6 m
  D) 16 m
  E) 160 m


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

aham8f

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


asmith134

  • Member
  • Posts: 576
Reply 2 on: Jul 27, 2018
Gracias!

Dnite

  • Member
  • Posts: 297
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Everyone has one nostril that is larger than the other.

Summation of Heart Sounds, S3 Summation of Heart Sounds, S3
Radio Frequency Lesion Radio Frequency Lesion
Crying Frequency in the Early Months In their first months of life, infants often cry for no appare Crying Frequency in the Early Months In their first months of life, infants often cry for no appare
recombination frequency recombination frequency
The first step is to verify the proper operation of the tester by measuring the air frequency by ... The first step is to verify the proper operation of the tester by measuring the air frequency by ...
Record the AC frequency as shown on the meter and subtract 50 from the reading (e.g., 60.50 -50.00 = ... Record the AC frequency as shown on the meter and subtract 50 from the reading (e.g., 60.50 -50.00 = ...
Video: Nerve Impulse Transmission Animation

For a complete list of videos, visit our video library