Where would very large craters have formed?
a. on the Moon.
b. on Mercury.
c. on Earth.
d. all of the above.
Answer: d. all of the above.
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Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as:
A) elliptical, not circular. B) much larger than Copernicus had envisioned. C) around the Sun, not the Earth. D) being on equants instead of epicycles. E) complex, with epicycles to account for retrograde motions.
A car travels east with a constant velocity. The magnitude of the acceleration of the car is
A) decreasing. B) increasing. C) constant non-zero. D) zero. E) None of the other choices is correct.
The water hole is important to SETI because it is a(n) ________ part of the radio spectrum
Fill in the blank(s) with correct word
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