PHYSICS 101 Mid-term Exam 2 Practice Questions:

___1) Suppose a certain carnival has a Ferris wheel where the seats are located halfway between the center and the outside rim. Compared to an ordinary Ferris wheel, where the seats are on the outside rim, your angular speed while riding this Ferris wheel would be:

A) less and your tangential speed less.

B) less and your tangential speed the same.

C) the same and your tangential speed the same.

D) the same and your tangential speed less.

E) more and your tangential speed the same.

___2) If you use larger diameter tires on your car for a given RPM (angular speed) your car’s linear speed will be:

A) less.

B) the same.

C) more.

___3) A torque acting on an object tends to produce:

A) change in equilibrium.

B) change in rotation.

C) change in linear motion.

D) change in velocity.

E) change in center of gravity.

___4) Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them is also doubled, then the force between them is:

A) one quarter.

B) one half.

C) the same.

D) twice as much.

E) four times as much.

___5) A “weightless” astronaut in an orbiting shuttle is:

A) shielded from Earth’s gravitational field.

B) beyond the pull of gravity.

C) pulled only by gravitation to the shuttle which cancels Earth’s gravitational pull.

D) like the shuttle, pulled by Earth’s gravitation and falling towards Earth.

E) in a situation where their centripetal force is just canceled by their electrical force.

___6) To say that an object is electrically polarized is to say:

A) it is electrically charged.

B) its internal electric field is zero.

C) it is only partially conducting.

D) its charges have been rearranged.

E) it is to some degree magnetic.

___7) When we say an appliance “uses up electricity,” we really are saying that:

A) current disappears.

B) electric charges go away.

C) the power supply voltage is substantially reduced.

D) electrons are taken out of the circuit and put somewhere else.

E) electron kinetic energy is changed into some other kind of energy.

___8) An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can handle 15 A of current. How many heaters can be safely operated in the circuit?

A) 2. B) 3. C) 4. D) 5. E) more than 5.

___9) Which statement is correct?

A) Charge flows in a circuit.

B) Voltage flows in a circuit.

C) Resistance flows in a circuit.

D) Resistance is established across a circuit.

E) Current causes voltage.