3.0 moles of an ideal gas with a molar heat capacity at constant ...

[cookcarl]

3.0 moles of an ideal gas with a molar heat capacity at constant volume of 4.9 cal/(molK) and a molar heat capacity at constant pressure of 6.9 cal/(molK) starts at 300 K and is heated at constant pressure to 320 K,
 
  then cooled at constant volume to its original temperature. How much heat flows into the gas during this two-step process?
  A) -720 cal B) 120 cal C) 0.00 cal D) 710 cal E) -120 cal

Question 2

Two radio antennas are 10 km apart on a north-south axis on a seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz.
 
  A steamship, 200 km offshore, travels due north at a speed of 15 km/hr and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. The time interval until the next occurrence of maximum reception is closest to: A) 5.1 min
  B) 3.8 min
  C) 6.4 min
  D) 7.7 min
  E) 8.9 min

[nital]

Answer to Question 1

B

Answer to Question 2

A

[cookcarl]

Gracias!

[mammy1697]

Excellent