A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 ?T. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV
b. 0.20 mV
c. 0.17 mV
d. 0.27 mV
e. 0.34 mV
c
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When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.
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Answer the following statement true (T) or false (F)
A locomotive is pulling 19 freight cars, each of which is loaded with the same amount of weight
The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.22 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car, and friction is negligible.)
The speed of sound in air is dependent upon the air temperature and other factors. The speed of sound increases from 334 m/s to 341 m/s between 8:00am and 11:00am. If a horn produces sound with wavelength 0.75 m at 8:00am, what would it produce at 11:00am?
A. 73 cm B. 77 cm C. Not enough info given to solve. D. 75 cm