If the temperature of 2.000 moles of an ideal gas is increased by 50
C then what is the increase in the total internal energy?
A. 1,247 J
B. 1,980 J
C. 2,250 J
D. 2,750 J
E. 3,030 J
A. 1,247 J
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Two coaxial parallel plate discs are situated relative to each other as shown in the sketch. The diameter of the upper plate is 20 cm, and that of the lower plate is 40 cm. The lower plate is maintained at a uniform temperature of 500 K and the upper temperature is maintained at 456 K. To maintain these relative temperatures, a heater has to be installed in the upper plate. Assuming an environmental temperature of the surroundings at 300 K, determine the power necessary of the heater in the upper plate to maintain the two constant plate temperatures under steady state conditions.
GIVEN
• Two coaxial parallel plate discs at distance of L = 20 cm=0.2 m
• Upper plate diameter (D1) = 20 cm = 0.2 m
• Lower plate diameter (D2) = 40 cm = 0.4 m
• Upper plate temperature (T1) = 456 K
• Lower plate temperature (T2) = 500 K
• Surrounding temperature (Tsurr) = 300 K
FIND
(a) Power necessary of the heater in upper plate to maintain the constant plate temperatures under steady state conditions.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center?
G = 6.67 × 10?11 m3?kg?1?s?2; MEarth = 5.98 × 1024 kg
a.
2 m/s
b.
20 m/s
c.
200 m/s
d.
2000 m/s
e.
20,000 m/s
Answer the following statement(s) true (T) or false (F)
1. In the empty region between the plates of a charging capacitor, we must observe some kind of nonuniform magnetic field.
2. In a certain region of empty space, 
= 0 and is constant in time. Assume that the magnetic field in that region is unidirectional (everywhere points in the same direction). Such a field must also be uniform
What is the energy needed to change an He+ ion into an He++ ion? (The ionization energy of hydrogen is 13.6 eV)
a. 13.6 eV b. 54.4 eV c. 92.9 eV d. 112.4 eV