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

Author Question: Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other ... (Read 31 times)

CORALGRILL2014

  • Hero Member
  • *****
  • Posts: 525
on: Jul 29, 2018
Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other at You hear the sound intensity increase and then decrease periodically due to wave interference.
 
  How long does it take between successive instances of the sound intensity increasing?
  A) 1.79 s B) 1.43 s C) 1.54 s D) 1.66 s

Question 2

How many molecules are in (a) 1.0 cm3 of air at STP and (b) 1.0 cm3 of helium at STP? (R = 8.31 J/mol  K, NA = 6.022  1023 molecules/mol)
 
  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

sierramartinez

  • Sr. Member
  • ****
  • Posts: 313
Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

2.7  1019 molecules in both cases


CORALGRILL2014

  • Member
  • Posts: 525
Reply 2 on: Jul 29, 2018
Gracias!

jackie

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Excellent

« previous next »
 

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.

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

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?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Metabolic rates of animals that differ in size. Metabolic rates of animals that differ in size.
Estimating cicada population size and predation rates by birds. Estimating cicada population size and predation rates by birds.
Teenage Pregnancy Rates in Developed Countries Teenage Pregnancy Rates in Developed Countries
Start the vehicle’s engine and let run at 1000–1500 RPM. The engine is now running on fuel ... Start the vehicle’s engine and let run at 1000–1500 RPM. The engine is now running on fuel ...
A free-running circadian sleep–wake cycle 25.3 hours in duration. Despite living in an unchanging ... A free-running circadian sleep–wake cycle 25.3 hours in duration. Despite living in an unchanging ...
The Distribution of Growth Rates, 1975–2009 The Distribution of Growth Rates, 1975–2009
Video: Pores and Ion Channels

For a complete list of videos, visit our video library