While a variety of factors can produce red shifts in the spectrum, the one associated with the expansion of the universe is called
A) universal.
B) cosmological.
C) olberian.
D) relativistic.
E) the Zeeman Effect.
B
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When viewed from above, suppose that a helicopter’s rotor spins clockwise. The helicopter engine must continually exert a torque on the rotor to keep it spinning against the drag that the air exerts on the rotor. Note that a helicopter is usually designed so its center of mass is directly under the rotor. In order for the helicopter to hover motionless in the air, a small rotor at the helicopter’s tail is necessary. As viewed by someone looking at the tail from the helicopter’s front, the small rotor must blow air
A. To the left. B. To the right. C. Vertically upward. D. Vertically downward. E. In some combination of these directions.
The volume of an ideal gas changes from 0.40 to 0.51 m3 although its pressure remains constant at 52 000 Pa. What work is done on the system by its environment?
a. 5.7E+3 J b. –5.7E+3 J c. –2.1E+4 J d. 2.1E+4 J e. –2.7E+4 J
Science works efficiently by
a. testing models and keeping only those that work. b. stating facts that need to be memorized. c. rewarding those who prove things about how Nature works. d. asking for answers to all pressing human problems. e. valuing all models no matter what happens in experiments.
An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much time does it take for the complete increase in speed?
A) 0.25 s B) 4.0 s C) 0.0577 s D) 17.3 s E) 8.0 s