A horse and rider travel in a region in which the vertical component of the Earth’s magnetic field is 0.035mT, while the horizontal component is 0.022mT. Attached to the horse’s bridle is a metal bit, a cylinder approximately 15cm long, in the horse’s mouth that is oriented horizontally. If the horse is galloping at 15m/s, what is the induced potential difference between the ends of the bit?
A. 79mV
B. 93mV
C. 50?V
D. 93?V
E. 50mV
F. 79?V
F. 79?V
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- Between Mars and Jupiter
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A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. The fundamental frequency of the stretched string is in tune with the frequency of the second mode of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. If the temperature of the air decreases by 20
then what is the length of the organ pipe?
A. 75.0 cm B. 100 cm C. 125 cm D. 150 cm E. 175 cm
A convex lens has a focal length f. An object is placed at f on the axis. The image formed is located
A) at infinity. B) between 2f and infinity. C) at 2f. D) between f and 2f. E) between the lens and f.
An Earth satellite is in an elliptical orbit. The satellite travels faster when it is
A) nearest Earth B) farthest from Earth C) constant speed everywhere in orbit and in close orbit travels faster when orbiting 4) the Moon. 5) Earth. 6) both about the same for the same altitudes.