3.0 moles of an ideal gas with a molar heat capacity at constant volume of 4.9 cal/(mol?K) and a molar heat capacity at constant pressure of 6.9 cal/(mol?K)
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) 710 cal
B) -720 cal
C) 0.00 cal
D) 120 cal
E) -120 cal
D
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Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have
What of the following distance methods is used to determine the distance to the most distant galaxies?
a. radar echo b. supernova observations c. period-luminosity relationship of variable stars d. parallax
Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 20 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
a. 25 cm c. 50 cm b. 65 cm d. 29 cm
The current in a coil with a self-inductance of 1.5 mH increases from 0 to 2.0 A in a tenth of a second. What is the induced emf in the coil?
a. 15 mV c. 0.10 V b. 0.30 V d. 30 mV