Two springs, each with spring constant k, are attached end to end in a series fashion. A second pair of identical springs are also attached in series fashion. Then the pair of series attached springs are attached in parallel to each other. What is the effective spring constant of the resulting combination of springs?
a. k/2
b. 2k
c. either k/4 or 4k
d. k
[Ques. 2] The magnetic pole of the Earth nearest the geographic North Pole corresponds to which of the following?
a. a magnetic north pole
b. a magnetic south pole
c. a magnetic arctic pole
d. a magnetic Antarctic pole
[Ques. 3] Two springs, each with spring constant 33.0 N/m, are connected in parallel, and the combination is hung vertically from one end. A 18.0-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
a. 0.545 m
b. 0.136 m
c. 1.09 m
d. 0.273 m
e. 2.18 m
[Ques. 4] The magnetic field of the Earth is believed responsible for which of the following?
a. deflection of both charged and uncharged cosmic rays
b. deflection of charged cosmic rays
c. ozone in the upper atmosphere
d. solar flares
[Ques. 5] Three identical springs each have the same spring constant k. If these three springs are attached end to end forming a spring three times the length of one of the original springs, what will be the spring constant of the combination?
a. k
b. 3k
c. k/3
d. 1.73k
[Ques. 6] The term magnetic declination refers to which of the following?
a. angle between Earth's magnetic field and Earth's surface
b. Earth's magnetic field strength at the equator
c. tendency for Earth's field to reverse itself
d. angle between directions to true north and magnetic north
[Ques. 7] If it takes 7 N to stretch a spring 8 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 4 cm?
a. 3.5 N
b. 7 N
c. 14 N
d. 21 N
e. 28 N
[Ques. 8] Geophysicists today generally attribute the existence of the Earth's magnetic field to which of the following?
a. convection currents within the liquid interior
b. iron ore deposits in the crust
c. nickel-iron deposits in the crust
d. solar flares
[Ques. 9] Which is not an example of approximate simple harmonic motion?
a. A ball bouncing on the floor.
b. A child swinging on a swing.
c. A piano string that has been struck.
d. A car's radio antenna as it waves back and forth.
[Ques. 10] A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?
a. The magnet will move away from the fixed magnet.
b. The magnet will not move.
c. The magnet will move toward the fixed magnet.
d. The magnet will start to rotate.
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