An ideal gas with ? = 1.67 is initially at 0°C in a volume of 10.0 liters at a pressure of 1.00 atm. It is expanded adiabatically to a volume of 10.4 liters. What then is the temperature?
A) -7.10°C
B) 2.53°C
C) -22.7°C
D) 67.8°C
E) -19.5°C
A
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Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
An observer is moving in space toward a distant star at 200 km/s while the star is moving toward the observer at 400 km/s; the relative velocity being 600 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.067% increase c. 0.20% increase b. 0.20% decrease d. 0.033% decrease
Once an object strikes Earth's surface, it is called a "meteor"
a. True b. False Indicate whether the statement is true or false
The motion of a falling object is commonly investigated with the aid of a
A. stethoscope. B. stroboscope. C. kaleidoscope. D. microscope.