Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is
A) 1/2 yard/second.
B) 5 yards/second.
C) 50 yards/second.
D) not enough information
Answer: B
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When a liquid copper-nickel alloy is rapidly cooled, the center of the grains has a higher concentration of nickel atoms than the average concentration. This is _____________.
Fill in the blank(s) with the appropriate word(s).
A circular coil with 600 turns has a radius of 15 cm. The coil is rotating about an axis perpendicular to a magnetic field of 0.020 T. If the maximum induced emf in the coil is 1.6 V, at what angular frequency is the coil rotating?
A) 0.30 rad/s B) 0.60 rad/s C) 0.90 rad/s D) 1.4 rad/sec E) 1.9 rad/s
The light from an object moving tangentially (to your left or right) will exhibit
A) a blueshift. B) a redshift. C) a shift in peak wavelength towards the red. D) a shift in peak wavelength towards the blue. E) no shift.
The redshifts of the galaxies imply that the Universe is expanding and that we are at the center
a. True b. False Indicate whether the statement is true or false