A 0.588-m string is tightly clamped at both ends. If the lowest standing wave frequency of the string is how fast do waves travel on this string?
A) 475 m/s B) 582 m/s C) 383 m/s D) 724 m/s
C
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A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
A. 0.32 A B. 0.34 A C. 0.37 A D. 0.39 A E. 0.43 A
A strong magnetic field easily penetrates
A) human flesh. B) plastic coatings. C) both of these D) none of the above
Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because
A) it is too dangerous to send the Space Shuttle to service satellites during solar maximum. B) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits. C) of increased magnetic interference. D) they are more likely to have their electronics "fried" by a solar flare during solar maximum.
Among the following electromagnetic waves, photons of which electromagnetic radiations carry the lowest energy?
A) Radio waves B) Visible light C) Ultraviolet D) Gamma rays