Energy and Mass: How much mass is lost during a reaction in which 1.7 × 108 MeV of energy is released? (c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
A. 1.8 × 10-8 kg
B. 5.7 × 10-9 kg
C. 1.9 × 10-17 kg
D. 3.0 × 10-22 kg
Answer: D
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The source of electrons lighting an incandescent ac light bulb is
A) the power company. B) the electric outlet. C) atoms in the light-bulb filament. D) the wire leading to the lamp. E) the source voltage.
A copper wire, 0.8 mm OD, 5 cm long, is placed in an air stream whose temperature rises at a rate given by Tair = (10+ 14t)°C, where t is the time in seconds. If the initial temperature of the wire is 10°C, determine its temperature after 2 s, 10 s and 1 min. The heat transfer coefficient between the air and the wire is 40 W/(m2 K).
GIVEN
• A copper wire is placed in an air stream
• Wire diameter (D) = 0.8 mm=8*10-4 m
• Wire length (L) = 5 cm=0.05 m
• Air stream temperature is: Tair = (10 + 14t)°C
• The initial temperature of the wire (To) = 10°C
• The heat transfer coefficient ( )ch = 40 W/(m2 K)
FIND
• The wire temperature after 2 s, 10 s and 1 min
ASSUMPTIONS
• Constant and uniform heat transfer coefficient
SKETCH
PROPERTIES AND CONSTANTS
For copper at 127°C
• Thermal conductivity (k) = 383 W/(m K)
• Density (?) = 8933 kg/m3
• Specific heat (c) = 383 J/(kg K)
One phenomenon that the geocentric models struggled to explain was ________.
A. retrograde motion B. sunspots C. the rotation of Earth D. parallax E. epicycles
In a series LRC circuit the rms voltage across the resistor is 80.0 V, across the capacitor is 120 V, and across the inductor is 60.0 V. What is the rms voltage applied to this circuit?
A. 60.0 V B. 80.0 V C. 100 V D. 120 V E. 140 V