The magnetic pole of the Earth nearest the geographic South Pole corresponds to which of the following?
a. a magnetic south pole
c. a magnetic north pole
b. a magnetic Antarctic pole
d. a magnetic arctic pole
[Ques. 2] A simple pendulum has a period of 1.0 s. What is the pendulum length? (g = 9.8 m/s2)
a. 0.25 m
c. 0.99 m
b. 0.39 m
d. 1.0 m
[Ques. 3] The magnetic field of the Earth is believed responsible for which of the following?
a. deflection of charged cosmic rays
b. ozone in the upper atmosphere
c. solar flares
d. deflection of both charged and uncharged cosmic rays
[Ques. 4] By what factor should the length of a simple pendulum be changed if the period of vibration were to be quadrupled?
a. 16
c. 0.25
b. 4.0
d. 1/16
[Ques. 5] Geophysicists today generally attribute the existence of the Earth's magnetic field to which of the following?
a. solar flares
c. currents within the liquid interior
b. iron ore deposits in the crust
d. nickel-iron deposits in the crust
[Ques. 6] Halving the mass of the bob on a simple pendulum will cause a change in the frequency of the pendulum swing by what factor?
a. 4.0
c. 1.0
b. 2.0
d. 0.50
[Ques. 7] Magnetic reversals of the Earth's field have occurred on the average every 200,000 years over the past 5 million years. When was the last magnetic reversal?
a. about 200,000 years ago
c. about 990,000 years ago
b. 1792
d. about 780,000 years ago
[Ques. 8] If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed?
a. about 6.0
c. about 0.41
b. about 2.5
d. about 0.17
[Ques. 9] The magnetic domains in a magnetized piece of iron are characterized by which orientation?
a. anti-parallel (opposite direction) to the magnetic axis
b. perpendicular to the magnetic axis
c. parallel to the magnetic axis
d. random
[Ques. 10] The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.120 m) cos (pt/16). What is the maximum net force on the mass as it oscillates?
a. 0.98 10-3 N
c. 3.0 10-3 N
b. 7.4 10-3 N
d. 4.7 N
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