Which force would not be explained in a grand unified theory, but would require a "theory of everything"?
a. The weak force.
b. The strong (or color) force.
c. The electromagnetic force.
d. The gravitational force.
e. The electroweak force.
d
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The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____
a. 10 parsecs b. 50 parsecs c. 100 parsecs d. 200 parsecs e. 500 parsecs
The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions?
a. clockwise c. It is always positive. b. counterclockwise d. It is always negative.
Shield volcanoes, like those on Venus and Mars, occur ____
a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera
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.