Which of the following worlds is the one for which we have sent the most space missions to learn about the potential of life beyond the Earth?
A) the Moon
B) Venus
C) Mars
D) Europa
E) Titan
C) Mars
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Which spectrum is shown above?
a. continuous
b. emission
c. absorption
d. blackbody
Rank the electric potential energies of the systems of charges shown in Figure OQ25.9 from largest to smallest. Indicate equalities if appropriate
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
A car traveling at 3.0 m/s has a constant acceleration of 4.0 m/s2 . After 2.0 seconds, the velocity is
A. 5.0 m/s. B. 7.0 m/s. C. 9.0 m/s. D. 11 m/s. E. 13 m/s.