The principal axis is the
A) straight line drawn from the center of curvature to the mid point of the mirror.
B) straight line drawn from the center of curvature to any point of the mirror.
C) straight line drawn from the center of curvature to a point on the outer edge of the mirror.
D) straight line joining any two points on the mirror.
E) None of the other answers given is correct.
A
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A transformer is a device that
A) operates on either DC or AC. B) operates only on AC. C) operates only on DC. D) increases the power level of a circuit.
The Bernoulli effect causes fast-moving vans on the highway to be drawn together when
A) air speeds up in passing between them. B) air between them stagnates. C) they experience lift. D) all of the above
A 5-turn square loop (10 cm along a side, resistance = 4.0 ?) is placed in a magnetic field that makes an angle of 30° with the plane of the loop. The magnitude of this field varies with time according to B = 0.50t2, where t is measured in s and B in T. What is the induced current in the coil at t = 4.0 s?
a. 25 mA b. 5.0 mA c. 13 mA d. 43 mA e. 50 mA
The helium core flash occurs in very high mass stars
a. True b. False Indicate whether the statement is true or false