For a long ideal solenoid having a circular cross-section, the magnetic field strength within the solenoid is given by the equation B(t) = 5.0t T, where t is time in seconds
If the induced electric field outside the solenoid is 1.1 V/m at a distance of 2.0 m from the axis of the solenoid, find the radius of the solenoid.
A) 0.30 m
B) 77 m
C) 0.94 m
D) 9.0 m
C
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Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A) 6.9 m/s B) 8.4 m/s C) 331 m/s D) 347 m/s
The period-luminosity relation for Cepheid variables was discovered in 1908 by:
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
New surveys suggest brown dwarfs, stars under the critical mass for stable fusion, are probably very rare.
Answer the following statement true (T) or false (F)
If the material for life were introduced from space after the Earth formed, a major carrier would have been:
A) the solar wind. B) tektites from the Moon. C) comet impacts. D) encounters with other solar systems. E) iron meteorites.