Experienced players can throw a Frisbee so it skips off the ground (the Frisbee’s front edge actually tips upward after the Frisbee hits, enabling it to climb back into the air). If a right-handed player throws a Frisbee in the usual way, it rotates counterclockwise when viewed from above. To skip the Frisbee, which edge has to hit the ground (as seen by the thrower)? (Hint: The Frisbee’s angular momentum vector, and thus its rotation axis, changes in the direction of the external torque that the strike applies to the Frisbee.)
A. The back edge
B. The front edge
C. The right edge
D. The left edge
E. The entire rim must hit the ground simultaneously.
D. The left edge
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Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has radius RA = 8 cm and flow velocity vA = 2 cm/s. Pipe B has radius RB = 4 cm and flow velocity vB = 4 cm/s. Compared to the rate of flow in pipe A, that in pipe B is
A. twice as large. B. the same. C. half as large. D. It depends on the length of the pipe
The diameter of no. 12 copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A
At this current, what is the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is 8.5 × 1022.) A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 m/s
Neptune has a larger fraction of methane in its atmosphere than Uranus
Indicate whether the statement is true or false
At which latitude is the noonday Sun overhead twice a year?
a. 30°S b. 23°S c. 24°N d. 30°N