A CD has a diameter of 12.0 cm. If the CD is rotating at a constant frequency of 4.00 cycles per second, then the tangential velocity of a point on the circumference is
A. 1.25 m/s.
B. 1.31 m/s.
C. 1.51 m/s.
D. 1.82 m/s.
E. 2.00 m/s.
C. 1.51 m/s.
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Which statement is correct?
A. No systems of multiple exoplanets have been detected. B. No gas giants have been detected orbiting closer than 1 au to their stars. C. No exoplanets have been detected orbiting closer than 1 au to their stars. D. No exoplanets have been detected orbiting binary stars. E. None of these choices are correct.
Refer to the data in the introduction. Rank the seasons for the Southern Hemisphere based on Earth’s distance from the Sun when each season begins, from closest to farthest.
What will be an ideal response?
Two conducting wires A and B of the same length and radius are connected across the same potential difference. Conductor A has twice the resistivity of conductor B. What is the ratio of the power delivered to A to the power delivered to B?
1.2 2.?2 3.1 4.1/?2 5.1/2
A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is
A) ?O I/2R. B) ?O I/4R. C) ?O I/8R. D) ?O I/4?R. E) ?O I/8?R.