A coil in a magnetic field encloses a flux of 0.196 T·m2 when the angle between the normal to the coil and the direction of the magnetic field is 62.0°. What flux would go through the coil if the angle were changed to 38.9°?
a. 0.118 T·m2
b. 0.123 T·m2
c. 0.539 T·m2
d. 0.325 T·m2
e. 0.139 T·m2
d
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Banked Curves: The curved section of a speedway is a circular arc having a radius of 190 m. This curve is properly banked for racecars moving at 34 m/s. At what angle with the horizontal is the curved part of the speedway banked?
A. 32° B. 34° C. 30° D. 28° E. 26°
Entropy: When water at 0°C freezes, the entropy of the water
A. increases. B. decreases. C. remains constant. D. could either increase or decrease; it depends on other factors.
A microphone in the ocean is sensitive to the sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 1.02 × 10^?11 W/m2 . If porpoises emit sounds with a power of 0.049 9 W, how far away can a porpoise be and still be heard? Disregard absorption of sound waves by the water
An asteroid in orbit about the Sun has a linear speed of 4 km/s when at a distance of closest approach d from the sun. What is its linear speed when it is at its greatest distance from the sun, a distance 4d?
a. 1 km/s c. 8 km/s b. 2 km/s d. 16 km/s