Light travels at 300,000 km/sec. About how far does light travel in 10 years?
A) about 3,000,000 kilometers
B) about 30,000 kilometers
C) about 10 light-years
D) about 10 trillion kilometers
E) about 30 million seconds
C
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Derive the control volume energy balance equation for three-dimensional transient conduction with heat generation in a rectangular coordinate system.
GIVEN
- Three-dimensional transient conduction with heat generation in a rectangular coordinate system
FIND
(a) The control volume energy balance equation
SKETCH
The average orbital speed of a star around the center of our galaxy depends primarily on
A) the mass of the Milky Way's central black hole. B) the mass of the entire galaxy, including the halo. C) whether the star is in the disk or halo of the galaxy. D) the mass of the galaxy inside its orbit.
Which are places on Earth where convection is operating on a grand scale, creating conditions important to life on Earth?
A) in the mantle B) in hot springs like Old Faithful C) in the troposphere, such as a summer thunderstorm D) at the thermal vents in the rift valleys E) All of the above are good examples.
A locomotive is pulling a number of identical wagons along a level track and accelerating. Friction is negligible. Starting from the last wagon, the ratio of the forces between adjacent wagons is
A) 1:2:3:4 . . . B) 1:2:4:8 . . . C) 1:3:5:7 . . . D) . . . E) 1:1:1:1 . . .