Question

Please answer all. Will vote up!

Part A:

A submarine heads toward a port, which broadcasts a signal at  125 MHz. If the submarine heads toward the port at 40 m/s, what change in frequency does the submarine observe in the port's signal?

A submarine heads toward a port, which broadcasts a signal at  125 MHz. If the submarine heads toward the port at 40 m/s, what change in frequency does the submarine observe in the port's signal?

5.00×10⁹ Hz

16.7 Hz

3.13×10⁶ Hz

3.20×10⁻⁷ Hz

Part B:

A ray of light is incident on a plane mirror at an angle of 44°, relative to the normal of the mirror. If the normal of the mirror is rotated by an angle 20°, away from the incident ray, what is the new angle of reflection?

A ray of light is incident on a plane mirror at an angle of 44°, relative to the normal of the mirror. If the normal of the mirror is rotated by an angle 20°, away from the incident ray, what is the new angle of reflection?

14°

2.2°

64°

24°

Part C:

A 0.25 T magnetic field is perpendicular to a circular loop of wire with 15 turns and a diameter of 3.0×10⁻² m. If the magnetic field is reduced to zero in 0.30 s, what is the magnitude of the induced emf?

A 0.25 T magnetic field is perpendicular to a circular loop of wire with 15 turns and a diameter of 3.0×10⁻² m. If the magnetic field is reduced to zero in 0.30 s, what is the magnitude of the induced emf?

8.8×10⁻³ V

1.8×10⁻² V

3.2×10⁻³ V

7.1×10⁻² V

Part D:

A RL circuit includes a 0.15 H inductor, which are connected to three identical resistors in parallel. If the circuit is to have a characteristic time of 0.35 s, what should be the resistance of the resistors used in the circuit?

A RL circuit includes a 0.15 H inductor, which are connected to three identical resistors in parallel. If the circuit is to have a characteristic time of 0.35 s, what should be the resistance of the resistors used in the circuit?

8.57×10⁻² Ω

0.857 Ω

1.29 Ω

0.143 Ω

Show work please.

Answer 1