A cubical gaussian surface surrounds a long, straight, charged filament that passes perpendicularly through two opposite faces. No other charges are nearby. Over how many of the cube’s faces is the electric field zero?
1.0
2.2
3.4
4.6
1
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A laminar flow is desired from a tank with a well-rounded entrance to a 6-mm-diameter pipe that drains the tank. A container catches 20 L of 20°C water in 4 minutes. Determine the Reynolds number so one can decide if the flow is laminar.
(A) 972 (B) 1220 (C) 1770 (D) 1920
In the context of a planetary atmosphere, what is a bar?
A) the surface pressure on any planet B) a description of the atmospheric composition on Earth C) a place where lawyers can get sodas and other drinks D) a unit of pressure roughly equal to the atmospheric pressure at sea level on Earth
A transverse periodic wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). Another transverse wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). What is the equation that represents the superposition of the two waves?
A. y(x, t) = 3.0 cm sin(1,500 rad/s t - 10.0
x)
B. y(x, t) = 3.0 cm sin(1,500 rad/s t) cos(10.0x)
C. y(x, t) = +3.0 cm cos(1,500 rad/s t) sin(10.0x)
D. y(x, t) = 3.0 cm sin(1,500 rad/s t + 10.0x)
Which would burn your skin the most?
A) 100 g of water at 100°C B) 100 g of steam at 100°C C) both equal