A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
a. 2.7 V
b. 2.1 V
c. 2.4 V
d. 1.8 V
e. 3.3 V
d
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The highest-strength aluminum alloys, such as 7075-T6, are strengthened by _________-hardening.
Fill in the blank(s) with the appropriate word(s).
A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s2 . What is its angular speed after this 7.0-s interval?
a. 0.20 rad/s b. 0.30 rad/s c. 0.46 rad/s d. 0.78 rad/s
Galaxies sometimes have recession speeds that deviate somewhat from the exact speed predicted by Hubble's law. What do these so-called peculiar velocities reveal?
A) velocities due to the gravitational tugs of nearby galaxies or clusters of galaxies B) deviations in the rate at which the universe has been expanding at different times in the past C) These velocities indicate serious discrepancies with Hubble's law and with our view of an expanding universe. D) These velocities indicate that the expansion rate differs for different directions in space.
The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is __________
Fill in the blank(s) with correct word