Two point charges of magnitudes + 8.00 ?C, and + 10.0 ?C are placed along the x-axis at x = 0 cm and x = 100 cm, respectively
Where must a third charge be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 4.72 cm
B) 47.2 cm
C) 50 cm
D) 9.12 cm
E) 91.2 cm
B
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A black sphere (2.5-cm in diameter) is placed in a large infrared heating oven whose walls are maintained at 370°C. The temperature of the air in the oven is 90°C and the heat-transfer coefficient for convection between the surface of the sphere and the air is 30 W/(m2 K). Estimate the net rate of heat flow to the sphere when its surface temperature is 35°C.
GIVEN
• A black sphere in a large infrared heating oven
• Sphere diameter (D) = 2.5 cm = 0.025 m
• Oven wall temperature (T2) = 370°C = 643 K
• Oven air temperature (T?) = 90°C = 363 K
• Convective heat transfer coefficient (hc) = 30 W/(m2 K)
• Sphere surface temperature (T1) = 35°C = 308 K
FIND
• The net rate of heat flow to the sphere (qtotal)
ASSUMPTIONS
• The oven walls are diffuse
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/m2K4
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A) exoplanet B) evening star C) pulsar planet D) morning star
Discuss the important features that allow space-based telescopes to search for transiting exoplanets
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A proton's rest mass is 1.67 × 10^-27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^-10 J b. 1.5 × 10^-10 J c. -2.0 × 10^-10 J d. 2.5 × 10^-10 J e. 7.5 × 10^-10 J