The average intensity of the sunlight in Miami, Florida, is 1.04 kW/m2
For surfaces on which the light is all absorbed, what is the average value of the radiation pressure due to this sunlight in Miami?
(c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.28 µPa
B) 1.73 µPa
C) 6.93 µPa
D) 3.47 µPa
E) 9.78 µPa
D
You might also like to view...
Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 Newtons at an angle of 37.0° upward from the horizontal. If he pulls her a distance of 12.0 m, the work he does is
A) 0.333 kJ B) 720 J C) 575 J D) 433 J E) 185 J
Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?
A. Both are correct: an object is in equilibrium if either condition holds. B. Neither is correct: both conditions must hold simultaneously. C. Neither is correct: the net external force and the net external torque about any axis must be zero. D. Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems. E. Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.
The greater the wavelength of light, the greater its energy
Indicate whether the statement is true or false
A large body of nonluminous gas at a temperature of 1100°C has emission bands between 2.5 and 3.5 ?m and between 5 and 8 ?m. At 1100°C, the effective emittance in the first band is 0.8 and in the second 0.6. Determine the emissive power of this gas in W/m2.
GIVEN
• A large body of nonluminous gas
• Gas temperature (T) = 1100°C = 1373 K
• Emission bands: 2.5 ?m < ?1 < 3.5 ?m 5 ?m < ?2 < 8 ?m
• Effective emittances: ?1 = 0.8; ?2 = 0.6
FIND
• The emissive power (E) in W/m2
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)