Physics, 30.08.2021 19:40 gwendallinesikes
20. How do astronomers use Hydrogen's unique spectral patterns to determine that the Sun's outer almosphere is
primarily Hydrogen?
The white light that reaches Earth
has only the colors of Hydrogen
b. is missing the colors of Hydrogen
c. is primarily made of Hydrogen
d. has the pattern of all other gasses except Hydrogen
Answers: 3
Physics, 22.06.2019 23:30
Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?
Answers: 1
Physics, 23.06.2019 02:30
Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?
Answers: 3
Physics, 23.06.2019 08:00
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
Physics, 23.06.2019 21:30
Find the magnitude of the net force on a rigid square loop of wire of side, l, equal to 6.77 cm. the center of the loop is 10.40 cm from the wire and the loop carries a current of 10.0 a.
Answers: 2
20. How do astronomers use Hydrogen's unique spectral patterns to determine that the Sun's outer alm...
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