At the end of the first fifteen minutes, the mass ratio of H/He created was about:
A) 50/50.
B) 75/25.
C) 27/73.
D) 90/10.
E) 1/4.
B
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A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 300 m. How fast can she swim in still water?
A) 1.24 m/s B) 1.83 m/s C) 0.50 m/s D) 1.42 m/s E) 0.25 m/s
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
A
b.
B.
c.
C.
d.
D.
e.
E.
When you walk barefoot in a room, the floor feels cooler walking on a tile floor as compared to a wooden floor because
A) tile has a smaller specific heat than wood. B) tile has a larger specific heat than wood. C) tile has a smaller thermal conductivity than wood. D) tile has a larger thermal conductivity than wood. E) none of the above
A stretched string is observed to vibrate in three equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?
a. 480 Hz b. 320 Hz c. 160 Hz d. 640 Hz e. 240 Hz