A banked curve in a roadway is designed for a speed of 35 mph. During an ice storm cars should be able to safely negotiate this curve at 35 mph, because at this speed
A. the necessary centripetal force is supplied entirely by the normal force from the road.
B. (and at all speeds) the acceleration vector of the car points down, helping maintain stability.
C. the necessary centripetal force is supplied entirely by gravity.
D. the centrifugal force of the car exactly balances the centripetal force.
Answer: A
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A primary current of 6.0 A exists in an ideal iron-core transformer at a primary voltage of 100 volts. If the current in the secondary is 0.75 A, calculate the output voltage
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