Calculate the radius in nanometers of the orbit of a hydrogen atom's electron with n = 5
1.3 nm
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Answer the following statement true (T) or false (F)
What is the first step in treating raw sewage?
A) filtration of solids B) removal of fine particles by settling C) removal of grit by settling D) removal of sludge E) disinfection
Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
GIVEN
-Two radiant shields placed in the evacuated space between two infinite planes
-Temperature of the planes
-T1 = 555 K
-T4 = 278 K
-Emissivity of all surface (?) = 0.8
FIND
-The steady state temperatures of the shields (T2, T3)
ASSUMPTIONS
• All surfaces are gray and diffuse
SKETCH
Acceleration is the time rate of change of what?
a. distance b. speed c. displacement d. velocity