When a car goes around a curve of smaller and smaller radius, the centripetal force on it decreases.
Indicate whether the statement is true or false
[Ques. 2] Why do compasses point north?
a. Because the Coriolis force tends to force to point to the North Pole.
b. Because Earth is a magnet with a magnetic north pole near the geographic North Pole.
c. Because Earth is a magnet with a magnetic south pole near the geographic North Pole.
d. Because the Earth is unmagnetized but its atmosphere is magnetic, especially near the North Pole.
e. Because the Coriolis force deflects magnetic field lines to the right.
[Ques. 3] You are presently exerting a gravitational force on the earth.
Indicate whether the statement is true or false
[Ques. 4] In the apparatus shown here, when the switch is open there is not attractive force between the wires. When the switch is closed, the currents are in the same direction and the wires are attracted to each other. If the currents in the two parallel wires were to point in opposite directions, what would be the force between the wires?
a. Attractive.
b. Repulsive.
c. Zero.
d. One is pushed up and the other pushed down.
e. Each one pushes the other up.
[Ques. 5] The weight of an object equals its mass times the acceleration of gravity.
Indicate whether the statement is true or false
[Ques. 6] What is one relationship of superconductors to magnets?
a. Superconductors draw in their own magnetic fields and thus attract magnets.
b. Superconductors affect nearby magnetic fields.
c. Superconductors expel their own magnetic fields and thus repel magnets.
d. Superconductors have no more relation to magnetic fields than ordinary conductors.
e. Superconductors can be used to create magnetic monopoles.
[Ques. 7] Net force means the vector sum of all the individual forces acting on a particular body.
Indicate whether the statement is true or false
[Ques. 8] Once a current has been established in a superconducting material, how much energy is needed to keep it going?
a. None.
b. Energy must be continuously provided as the same rate that was used to establish the current in the first place.
c. Energy must continue to be provided at a lower rate than initially.
d. Superconductors remove energy from the environment to maintain the current.
e. The power needed to maintain the current is half that to establish it initially.
[Ques. 9] All forces have specific directions associated with them.
Indicate whether the statement is true or false
[Ques. 10] How is the unit of a tesla defined?
a. 10,000 tesla is one coulomb.
b. The strength of the electric field one meter away from a point charge of 1 coulomb is one tesla.
c. The strength of the electric field at a distance of 1 meter from a long straight wire carrying a charge of 1 coulomb per meter is one tesla.
d. The strength of the magnetic field at a distance of 1 meter from a long straight wire carrying a current of 1 ampere is 2 10-7 tesla.
e. One tesla is one thousand volts.
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