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

Author Question: It is possible to hear an approaching train before you can see it by listening to the sound wave ... (Read 207 times)

jho37

  • Hero Member
  • *****
  • Posts: 531
on: Jul 28, 2018
It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0  1011 N/m2 and the density of steel is 7.8  103 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair  340 m/s.)
 a. 20
  b. 5
  c. 10
  d. 15
  e. 25

Question 2

The Young's modulus for aluminum is 7.02  1010 N/m2 . If the speed of sound in aluminum is measured to be 5.10 km/s, find its density (in kg/m3).
 a. 11.3  103
  b. 7.80  103
  c. 2.70  103
  d. 29.3  103
  e. 1.40  103


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

underwood14

  • Sr. Member
  • ****
  • Posts: 346
Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

c


jho37

  • Member
  • Posts: 531
Reply 2 on: Jul 28, 2018
Gracias!

jomama

  • Member
  • Posts: 346
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Future train Future train
Wave Travel Wave Travel
Characteristics of Sound: Frequency and Amplitude Characteristics of Sound: Frequency and Amplitude
The physician uses percussion—tapping—to detect sound or vibration. The physician uses percussion—tapping—to detect sound or vibration.
Apply effleurage with wave motion to posterior cervical region. Use fingertips to slide along ... Apply effleurage with wave motion to posterior cervical region. Use fingertips to slide along ...
The hazmat training pyramid. It is important to train from the ground up, starting with a firm grasp ... The hazmat training pyramid. It is important to train from the ground up, starting with a firm grasp ...
Video: Hierarchical Sequencing Method - Sequence Tagged Sites

For a complete list of videos, visit our video library