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

Author Question: In western movies you often see a person putting his ear against the rails in the train tracks to ... (Read 70 times)

lindiwe

  • Hero Member
  • *****
  • Posts: 577
on: Jul 29, 2018
In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching.
 
  Why would this give him advance knowledge of the approach of a train?

Question 2

You are on an airplane traveling with a constant velocity at an altitude of 20,000 m. What is the acceleration of gravity at that altitude? The radius of Earth is 6.37  106 m.
 
  A)
 
  9.81 m/s2
 
  B)
 
  9.78 m/s2
 
  C)
 
  9.75 m/s2
 
  D)
 
  9.72 m/s2
 
  E)
 
  9.69 m/s2


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Mholman93

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jul 29, 2018
Answer to Question 1

The speed of sound in metals is considerably faster than the speed of sound in air.

Answer to Question 2

C


lindiwe

  • Member
  • Posts: 577
Reply 2 on: Jul 29, 2018
Gracias!

meow1234

  • Member
  • Posts: 333
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Pre–Main-Sequence Evolutionary Tracks Pre–Main-Sequence Evolutionary Tracks
Western pygmy possum Western pygmy possum
J. M. W. Turner, Rain, Steam, and Speed—The Great Western Railway. J. M. W. Turner, Rain, Steam, and Speed—The Great Western Railway.
Seriation features operations of comparing the length of each stick to the other sticks and putting ... Seriation features operations of comparing the length of each stick to the other sticks and putting ...
Western basin edges are dominated by warm poleward-directed currents (for example, Gulf Stream), ... Western basin edges are dominated by warm poleward-directed currents (for example, Gulf Stream), ...
Compression using reinforced palm. The heel of the top hand is placed to avoid putting pressure on ... Compression using reinforced palm. The heel of the top hand is placed to avoid putting pressure on ...
Video: Simple and Double Sugar

For a complete list of videos, visit our video library