Q: For the oscillator above, what is the kinetic energy when the block is at $$A/4$$, where $$A is $$the amplitude?

$$1.45 \times 10$$^{-4}$$\ \text{J}$$

Q: A charged particle moves in a uniform magnetic field with radius $$R_{\text{initial}}. If $$the speed is doubled and the magnetic field is halved, what is the new radius?

$$R_{\text{new}} = 4R_{\text{initial}}$$

Q: Two long current-carrying wires $$I_1$$ and $$I_2$$ are arranged as shown. If $$I_1 = 2$A and I_2$ = 5A$$, what is the magnitude and direction of the net magnetic field at the origin?

$$2.75 \times 10$$^{-5}$$ T, 76° below +x-axis

Question 1

A light ray is incident from material 1 (refractive index $$n_1) $$onto material 2 (refractive index $$n_2). $$Under what condition is total internal reflection possible?

Accepted Answer

When $$n_1$$ \u003e $$n_2$$

Question 2

A light ray travels from water ($$n=1.33) $$into glass ($$n=1.5). If $$only a reflected ray is produced, what can be said about the angle of incidence $$\phi$$?

Accepted Answer

$$\phi \leq 27.54^\circ$$

Question 3

A 4 cm tall object is placed 3 cm in front of a concave mirror with a radius of curvature of 12 cm. What is the nature of the image formed?

Accepted Answer

Virtual, upright, enlarged, behind the mirror

Question 4

If the object in the previous question is moved closer to the mirror, what happens to the image?

Accepted Answer

The image becomes larger and moves closer to the mirror

Question 5

A 12 cm tall object is placed in front of a lens and produces an image that is $$\frac{1}{4}$$ the size of the object on a screen 10 cm from the lens. What is the focal length of the lens?

Accepted Answer

$$f = +8\ 	ext{cm}$$

Question 6

For the lens in the previous question, where is the object located relative to the lens?

Accepted Answer

40 cm from the lens

Question 7

A 5 kg mass on a spring exhibits simple harmonic motion. If the spring constant is $$k$$, and the period $$T is $$measured from the graph as 4 s, what is the value of $$k$$?

Accepted Answer

$$k = 3.08\ 	ext{N/m}$$

Question 8

For the oscillator above, what is the kinetic energy when the block is at $$A/4$$, where $$A is $$the amplitude?

Accepted Answer

$$1.45 	imes 10$$^{-4}$$\ 	ext{J}$$

Question 9

A ship approaches at 5.0 m/s and you hear a foghorn at 265 Hz. What is the actual frequency of the foghorn?

Accepted Answer

261 Hz

Question 10

If the boat moves to a quarter of its original distance, what is the change in decibel level?

Accepted Answer

+12 dB

Question 11

An ideal solenoid with 9 turns/cm and diameter 25 cm is connected to a power supply. A single loop of wire with diameter 30 cm and resistance 1.25 $$\Omega is $$placed outside. The solenoid current increases from 0.37 A to 1.2 A in 0.15 s. What is the magnitude and direction of the average induced current in the outer loop?

Accepted Answer

0.246 mA CCW

Question 12

A point charge +e is located at a distance D to the left of a -9e point charge. Along the line containing both charges, where is the electric field zero?

Accepted Answer

To the left of both charges, at $$\frac{D}{2}$$ from the +e charge

Question 13

What is the electric force on an electron placed at the position where the electric field is zero (from the previous question)?

Accepted Answer

Zero

Question 14

A charged particle moves in a uniform magnetic field with radius $$R_{	ext{initial}}. If $$the speed is doubled and the magnetic field is halved, what is the new radius?

Accepted Answer

$$R_{	ext{new}} = 4R_{	ext{initial}}$$

Question 15

Two long current-carrying wires $$I_1$$ and $$I_2$$ are arranged as shown. If $$I_1 = 2$A and I_2$ = 5A$$, what is the magnitude and direction of the net magnetic field at the origin?

Accepted Answer

$$2.75 	imes 10$$^{-5}$$ T, 76° below +x-axis

Question 16

Consider a circuit with resistors arranged as shown. What is the equivalent resistance of the circuit?

Accepted Answer

$$3.875\ \Omega$$

Question 17

How much current is flowing through resistor B in the circuit?

Accepted Answer

0.48 A

Question 18

What is the power dissipated through resistor B?

Accepted Answer

1.17 W

Question 19

If the resistors in the circuit are lightbulbs of the same type, which bulb would be brighter: RB or RC?

Accepted Answer

RC

Exam Review Guidance: Physics Concepts and Problem-Solving

Guida di studio - Domande di pratica

Study guide - Flashcard