In a graph of the history of U.S. energy use since 1950, why does the graph drop sharply after 1973?
A) The 1973 mideast oil embargo was followed by increased prices and a drop in consumption.
B) The Texas oil fields produced far less oil beginning in 1973, causing a price increase and a drop in consumption.
C) The Texas oil fields produced far less oil beginning in 1973, resulting in rationing and a switch to natural gas.
D) The 1973 mideast oil embargo was followed by gasoline rationing and a switch to domestic natural gas.
E) Analysts have not yet found a good explanation for this drop in U.S. energy use.
A
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Length Contraction: The figure shows a right-angled construction frame ABC. When measured at rest, it has dimensions as follows: AB = 18.9 m, AC = 10.0 m, and BC = 16.0 m. This frame is now given a new velocity of 0.420c, relative to Earth, in a direction parallel to AC. How long is part BC of this frame with the new velocity as measured by Earth-based engineers?
A. 16.0 m B. 14.0 m C. 12.0 m D. 10.0 m E. 18.0 m
What is a protostar?
A) a star that is still in the process of forming B) a star that has planets C) an intermediate-mass star D) a star in its final stage of life
A body moving along the x axis is acted upon by a force Fx that varies with x as shown. How much work is done by this force as the object moves from x = 1 m to x = 8 m?
?
?
A. ?2 J B. ?18 J C. ?10 J D. ?26 J E. +18 J
A boxcar without a front or a back is moving toward the right. Two electrons move through the boxcar, one moving from back to front toward the right, the other moving from front to back toward the left. According to me, each electron is moving with a speed of 0.8c, and the boxcar is moving with a speed of 0.6c. A passenger in the boxcar records how long it takes each electron to pass from one end
of the boxcar to the other end. According to the passenger, which took longer? a. the electron going from back to front b. the electron going from front to back c. They both took the same time. d. Since nothing can go faster than light, an electron cannot move toward the left with a speed of 0.8c through a boxcar moving toward the right with a speed of 0.6c.