The mass density of platinum is 21.4 × 103 kg/m3. A platinum wire with a radius of 0.500 mm, 1.20 m long, fixed at both ends has a frequency of vibration for its third harmonic equal to 512 Hz. What is the tension in the wire?
A)
4.00 kN
B)
2.00 kN
C)
2.82 kN
D)
1.41 kN
E)
1.00 kN
C
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Indicate whether the statement is true or false
Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
Radioactivity was discovered in
a. Berlin. b. Berkeley. c. Paris. d. Cambridge.