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

Author Question: An enclosed chamber with sound absorbing walls has a 2.0 m 1.0 m opening for an outside window. A ... (Read 51 times)

CQXA

  • Hero Member
  • *****
  • Posts: 546
An enclosed chamber with sound absorbing walls has a 2.0 m  1.0 m opening for an outside window. A loudspeaker is located outdoors, 78 m away and facing the window.
 
  The intensity level of the sound entering the window space from the loudspeaker is 79 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that the acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0  10-12 W/m2. The acoustic power entering through the window space is closest to A) 160 W.
  B) 79 W.
  C) 320 W.
  D) 790 W.
  E) 1600 W.

Question 2

If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
 
  A) True
  B) False



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cam1229

  • Sr. Member
  • ****
  • Posts: 329
Answer to Question 1

A

Answer to Question 2

B




CQXA

  • Member
  • Posts: 546
Reply 2 on: Jul 29, 2018
Wow, this really help


raenoj

  • Member
  • Posts: 340
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

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?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

For a complete list of videos, visit our video library