Circular Motion Pysics

What is the resistance in a 60-W, 12-V light bulb? 0.42 ohms 0.2 ohms 5 ohms 2.4 ohms

.02 ohms is not the answer

A 70-dB sound relative to a 40-dB sound is more intense by a factor of 1000. 3. 300. 30.

1000

Two charges repel each other with a force of 10-6 N when they are 10 cm apart. When they are brought closer together until they are 2 cm apart, the force between them becomes 5 x 10-6 N. 4 x 10-8 N. 2.5 x 10-5 N. 8 x 10-6 N.

2.5 x 10-5 N.

Two charges repel each other with a force of 10-6 N when they are 10 cm apart. When they are brought closer together until they are 2 cm apart, the force between them becomes 5 x 10>-6 N. 4 x 10>-8 N. 2.5 x 10>-5 N. 8 x 10>-6 N.

2.5 x 10>-5 N.

Radio amateurs are permitted to communicate on the "10-meter band." What frequency of radio waves corresponds to a wavelength of 10 meters? The speed of radio waves is 3 × 108 m/s. 3.0 × 10>9 Hz 3.0 × 10>7 Hz 3.3 × 10-8 Hz 3.3 × 10>7 Hz

3.0 × 10>7 Hz

A boat at anchor is rocked by waves whose crests are 50 m apart and whose speed is 10 m/s. These waves reach the boat once every 500 s. 5 s. 50 s. 0.2 s.

5 s

An electric iron draws a current of 15 A when connected to a 120-V power source. Its resistance is 16 ohms. 8 ohms. 0.125 ohms. 1800 ohms.

8 ohms.

Ocean waves whose period is 8 s are observed to have a wavelength of 100 m. Their speed is 100 m/s. 0.08 m/s. 12.5 m/s. 800 m/s.

800 m/s. is not the answer

A sound wave whose frequency is 50 Hz has a relatively short wavelength. is very soft. is very loud. has a relatively long wavelength.

has a relatively long wavelength