Author Question: 3.0 moles of an ideal gas with a molar heat capacity at constant volume of 4.9 cal/(molK) and a ... (Read 89 times)

cookcarl · **on:** Jul 29, 2018

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