Physics, 19.11.2019 23:31 merrickrittany
What do scientists study to figure out how long it takes the sun to make one rotation on its axis?
a. flares
b. auroras
c. sunspots
d. prominences
Answers: 1
Physics, 23.06.2019 02:00, kharmaculpepper
How many electrons does each element require in its valence shell to become stable?
Answers: 1
Physics, 23.06.2019 08:00, edjiejwi
Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?
Answers: 2
What do scientists study to figure out how long it takes the sun to make one rotation on its axis?...
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