As on Earth, continent-like land masses cover over a quarter of the surface of Venus
Indicate whether the statement is true or false
FALSE
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Intensity: A radio transmitter is operating at an average power of 4.00 kW and is radiating uniformly in all directions. What is the average intensity of the signal 8.00 km from the transmitter?
A. 4.97 ?W/m2 B. 2.49 ?W/m2 C. 0.00497 W/m2 D. 0.00249 W/m2
A blacksmith is flattening a steel plate, 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, what is the total rate of radiation of energy? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
Ignore heat exchange with the surroundings. A) 360 W B) 760 W C) 790 W D) 850 W E) 880 W
A bare roof on a warmly heated home on a snowy day indicates
A) an unwanted flow of heat B) poor insulation. C) fairly good conductivity. D) all of the above
The electric field along the axis of a ring-shaped charge of total charge Q distributed uniformly is given by E = Qx/(4? ?0 (x2+ a2)3/2 )
where a is the radius of the ring and x is the distance from the center of the ring. The electric field at the center of the ring is zero and at great distances from the ring approaches zero. At what position is the electric field a maximum for positive values of x?