If a satellite is in orbit around Earth and the satellite's altitude increases, then the circular velocity __________________
a. decreases
b. increases
c. is zero
d. None of the other choices are correct.
b
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Which of the following expresses 3 × 10-4 m correctly using the metric prefixes given?
The Sun creates its energy by the process of
a. nuclear fission. b. nuclear fusion. c. convection. d. conduction. e. radiation.
A wall of thickness L is made up of material with a thermal conductivity that varies with its thickness x according to the equation k=(ax+b) W/(m K) , where a and b are constants. If the heat flux applied at the surface of one end (x=0) of the wall is 20 W/m^2, derive an expression for the temperature gradient and temperature distribution across the wall thickness ( between x=0 and x=L). Use and define appropriate notations for surface temperatures at each end of the wall.
GIVEN • Thermal conductivity (k) varies according to equation k=(ax+b) W/(m K) • Heat flux applied (q/A)=20 W/m^2 FIND • Expression for temperature gradient and temperature distribution across wall thickness. ASSUMPTIONS • One dimensional, steady state conduction through the glass • Constant thermal conductivity
Because of refraction, a person standing waist deep in a swimming pool appears to have
A) shorter legs. B) longer legs. C) thinner legs. D) none of the above