The most abundant element in Saturn's atmosphere is
A) ammonia.
B) hydrogen.
C) helium.
D) methane.
E) nitrogen.
B
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It is decided to electropolish a complex cast copper sculpture, because the surface is too complex for mechanical polishing, and the as-cast surface does not have the required appearance. Through experimentation with piece of copper, it is found that a current density of 1 A/cm2 produces the required appearance. It is estimated that the entire surface of the sculpture is 100 cm2 , and it is decided to electropolish the sculpture at 100 A of current. No more than 0.0001 m of copper should be removed from the sculpture, so that the design shape is not altered. Determine the maximum time for electropolishing if the process is 100 % efficient?
What will be an ideal response?
What is the stratosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs X-rays E) the highest layer in the atmosphere
In an astronomical telescope the secondary mirror is
a. concave. b. convex. c. spherical. d. plane.
Energy Conservation With Conservative Forces: A roller coaster starts from rest at a height h at the left side of a loop-the-loop, as shown in the figure. It is not attached to the track in anyway, and there is no friction from the track or from air resistance. If the radius of the loop is R = 6.0 m, what is the minimum height h for which the roller coaster will not fall off the track at the top of the loop?
A. 21 m B. 18 m C. 15 m D. 12 m E. 8.5 m