A radiant heater element is made so that it is concentric about a copper tube, as shown in the figure. The heater is 1 cm thick, 10 cm OD, and 8 cm ID. The copper tubing is 4 cm in diameter, has an emissivity of 0.05, and is at 200ºC. The heater tubing has an emissivity of 0.9 on the inside, and 0.04 on the outside. The heater is at 1000ºC. If the surroundings are taken as a black body at 300 K, determine the power per unit length of the heater needed for steady state operation.
Physics & Space Science
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A butterfly moves with a speed of v = 12.0 m/s. The x-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis must be
A) 60.0° B) 41.8° C) 48.2° D) 30.0° E) 53.0°
Physics & Space Science
Sidereal period is defined as the time interval between two successive conjunctions of a planet with
a) the Sun as observed from Earth. b) Earth as observed from the Sun. c) any other planet besides Earth. d) any star other than the Sun.
Physics & Space Science
What impact does the formation of the ozone layer have on our planet?
What will be an ideal response?
Physics & Space Science
The large dark areas on the Moon that form the face of the "Man in the Moon" are called what?
A. rilles B. craters and rays C. maria D. All of these choices are correct.
Physics & Space Science