This topic contains a solution. Click here to go to the answer

Author Question: If the phase angle between sound waves from two different point sources is 180, what kind of ... (Read 89 times)

mp14

  • Hero Member
  • *****
  • Posts: 534
If the phase angle between sound waves from two different point sources is 180, what kind of interference will occur?
 
  A) destructive
  B) constructive
  C) either constructive or destructive

Question 2

Why do power tools with a plastic case not have a 3-prong plug but metal encased tools have (or should have) 3-prong plugs?
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dawsa925

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

A

Answer to Question 2

The third wire (large round prong plug) connects to ground and grounds the metal case. A hot wire accidentally coming in contact with the case will blow a fuse. A plastic case is insulation and does not need to be grounded for safety.




mp14

  • Member
  • Posts: 534
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)


ecabral0

  • Member
  • Posts: 310
Reply 3 on: Yesterday
Excellent

 

Did you know?

Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

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.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

For a complete list of videos, visit our video library