# Unit 8 Quiz #2 Targets 3-6

10 Questions | Total Attempts: 168  Settings  .

• 1.
Objects become electrically charged as a result of the transfer of
• A.

Protons

• B.

Electrons

• C.

Neutrons

• D.

Nuclei

• 2.
The nucleus of an atom has _______________ electric charge.
• A.

A positive

• B.

A negative

• C.

A neutral

• D.

Both positive or negative

• 3.
Rubbing a balloon through dry hair gives the balloon a _______________ electric charge.
• A.

Positve

• B.

Negative

• C.

A neutral

• D.

Balanced

• 4.
An electric force F exists between two objects, both having the charge q. If the charge on one object is doubled to 2q, the force between the objects becomes
• A.

1/4 F

• B.

1/2 F

• C.

2 F

• D.

4 F

• 5.
An electric force F exists between two objects separated from each other by distance r. If the distance is decreased to 0.5r, the force between the two objects becomes
• A.

1/4 F

• B.

1/2 F

• C.

2 F

• D.

4 F

• 6.
Electric force and gravitational force are alike in that both forces
• A.

Depend on charge

• B.

Depend on mass

• C.

Act only when objects are touching

• D.

Are field forces

• 7.
Which of the following best represents a difference between electric force and gravitational force?
• A.

Gravitational force is stronger than electric force.

• B.

Electric force can both attract and repel.

• C.

Electric force is inversely proportional to the square of the distance between objects.

• D.

Gravitational force exists between objects that are not touching.

• 8.
Two friends in France use a pendulum hanging from the world’s highest railroad bridge to exchange messages across a river. One friend attaches a letter to the end of the pendulum and releases it so that the pendulum swings across the river to the other friend. The bridge is 130.0 m above the river. How much time is needed for the letter to make one swing across the river? Assume the river is 16.0 m wide.
• A.

22.87 sec

• B.

8.02 sec

• C.

11.43 sec

• D.

4.01 sec

• 9.
Suppose you separate the electrons and protons in a gram of hydrogen and place the protons at Earth’s North Pole and the electrons at Earth’s South Pole. How much charge is at each pole if the magnitude of the electric force compressing Earth is 5.17 ´ 105 N? Earth’s diameter is 1.27 ´ 107 m.
• A.

9.63 x 10^4 C

• B.

4.63 x 10^9 C

• C.

19.11 C

• D.

182.59 C

• 10.
A large pearl was found in the Philippines in 1934. Suppose the pearl is placed on a spring scale whose spring constant is 362 N/m. If the scale’s platform oscillates with a frequency of 1.20 Hz, what is the mass of the pearl?
• A.

13.20 kg

• B.

6.37 kg

• C.

620.28 kg

• D.

1286.21 kg

Related Topics Back to top