When a fixed amount of ideal gas goes through an isobaric expansion
A) its internal (thermal) energy does not change.
B) the gas does no work.
C) no heat enters or leaves the gas.
D) its temperature must increase.
E) its pressure must increase.
D
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A 25-g traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 12,200 N c. 4900 N b. 9800 N d. 6100 N
A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s2
a. 0.35 s c. 0.70 s b. 0.42 s d. 0.89 s
First Law of Thermodynamics: In an adiabatic compression, 200 J of work is done on a gas. What is the change in internal (thermal) energy of the gas during this compression?
A. 0 J B. 100 J C. 200 J D. -200 J
Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?
A) globular clusters are the most likely place to find stars with planetary systems B) stars in globular clusters are rich in heavy elements, the building blocks of life C) signals from advanced civilizations have previously been detected coming from this cluster D) globular clusters are densely packed with stars, hence maximizing the probability of interception by an advanced civilization