How many helium nuclei fuse to make one carbon nucleus in the overall helium fusion reaction?
A) 2
B) 3
C) 4
D) varies depending on the type of carbon being made
B) 3
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A long steel beam with rectangular cross section of 40 cm by 60 cm is mounted on an insulating wall as shown in the following sketch. The rod is heated by radiant heaters that maintain the top and bottom surfaces at 300°C. A stream of air at 130°C cools the exposed face through a heat transfer coefficient of 20 W/(m2K). Using a node spacing of 1 cm, determine the temperature distribution in the rod and the rate of heat input to the rod. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Rectangular steel beam mounted on an insulating surface, heated top and bottom, with exposed face cooled by an air flow
FIND
(a) Temperature distribution in the rod (b) Rate of heat input to the rod
SKETCH
Which planet is often called our most brilliant "morning star"?
a. Venus b. Jupiter c. Mars d. Mercury e. Saturn
Which of the following has the highest specific heat?
a. ice b. water c. steam d. They are all water, so they all have the same specific heat.
As a projectile thrown upward at a non-vertical angle moves in a parabolic path, as in the figure, at what point along its path are the velocity and acceleration vectors for the projectile perpendicular to each other?