In an orbiting space station, an electronic package is housed in a compartment having a surface area, As = 1.5 m2 , which is exposed to space. Under normal operating conditions, the electronics dissipate 0.8 kW, all of which must be transferred from the exposed surface to space. The surface emissivity is 0.95. (a) If the surface is not exposed to the sun, what is its steady-state temperature (in ◦C)? (b) If the surface is exposed to a solar flux of 700 W/m2 and its absorptivity to solar radiation is 0.15, what is its steady-state temperature (in ◦C)?

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.