Concepts
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Word Problems
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BONUS: (2x Points)
Bonus 2: (2x Points)
100
In the figure shown, (a) shows a snapshot graph at t=0 s of two waves approaching each other at 1.0 m/s. At what time was the snapshot graph (b) taken?
t=2.0 s
100
What happens to the current of the battery when the switch closes?
I increases
Req decreases
∆V Doesn't Change
100
The figure shown is the position graph of a mass oscillating on a horizontal spring. What is the phase constant?
- pi/2
100
A thin glass rod is submerged in water. What is the critical angle for light traveling inside the rod?
1.09 rad
100
Two point sources of light illuminate a narrow vertical aperture in a dark screen. What do you see on the viewing screen?
Two lines on either side of the aperture
100
You and a friend are playing outside when you see an ant crawling. Your friend suggests lighting the ant on fire. Since you are an expert on lenses, you know you can use the sun and a certain type of lens to light the fire. What type of lens do you use?
Converging lens
200
You and a friend go to the store and find different colored flashlights, one fo each color of the rainbow. Since you aced your college physics class, you know that the different colors affect the diffraction angle if you were to diffract that light. How is the diffraction angle affected by these different wavelengths?
Sin theta = m(lamda/d)
As wavelength increases, angle increases.
ROYGBIV -> largest angle to lowest angle
200
An electron is moving near a long, current-carrying wire, as shown in the figure below. What is the direction of the magnetic force on the electron?
Upwards
200
How much charge flows through the battery as the capacitor is being charged?
4.56x10E-6 C
200
What is the thinnest film (but not zero) of MgF2 (n=1.54) on glass that produces a strong reflection for orange light with a wavelength of 603 nm?
t=9.79x10E-10 m
200
An opera singer in a convertible car sings a note at 483 Hz while cruising down the highway at 120 km/h. What is the frequency heard by a person on the ground behind the car?
440 Hz
200
A 1.83-m-tall man is 15 m in front of a camera with an 18-mm-focal-length lens. How tall is his image on the detector?
2.196x10^-3
300
Metal spheres 1 and 2 are touching. Both are initially neutral. The charged rod is brought near before the spheres are separated. After the separation, the charged rod is removed. Are the charges on the spheres positive, negative, or zero?
Q1 is - and Q2 is +
300
Carrie is playing her violin when she notices that the frequency of the note she is trying to play is too high. What should she do to lower the frequency of her instrument?
*Hint* slide: RM-18 or ED-23
if f decreases, T decreases
fn=(n/(2L))sqrt(T/M)
300
Antireflection coatings can be used on the inner surfaces of eyeglasses to reduce the reflection of stray light into the eye, thus reducing eyestrain. A 125-nm-thick coating is applied to the lens. What must be the coating’s index of refraction to be most effective at 600 nm? Assume the coating’s index of refraction is less than that of the lens.
n=1.2
300
A 1.5 m long, 2.0 mm diameter nichrome wire is connected to a 15 V battery. The magnetic field strength 5.0 cm away from the wire is 0.002 T. What is the resistance of the nichrome wire?
0.03 Ω
300
The figure shows a laser beam deflected by a 30-60-90 prism. The index of refraction outside the prism is n=1.46. What is the prisms index of refraction?
n=2.4
300
Current moves through this wire loop in the direction shown. A, B, C, and D are in the plane of the loop.
Where is the magnetic field strongest?
D
400
What is the magnetic field direction inside the current-carrying loop?
X (into the page)
400
Compare and contrast electric potential and electric potential energy. What equation shows the relationship between the two?
Elec. Pot. = V - Source Charge
V=Kq/r
Elec. Pot. Energy = U - 2 point charges
Uelec=
K(q1*q2)/r
Uelec=
qV
400
The current flowing through the circuit contained within a flashlight is 0.5 A and the voltage applied to the circuit is provided by 2 AA batteries, which is 5.0 V. Calculate the power delivered to the bulb and the electrical energy consumed in 5 minutes of operation of the flashlight.
750 J
400
What is the current through the 3 Ω resistor?
I=1 A
V=IR
(9V-6V)=I(3ohms)
3V=I(3 ohms)
3 V/3 Ohms=I
400
What is the electric potential energy of the group of charges in the figure?
0 J
400
A circular wave travels outward from the origin. At one instant of time, the phase at r1=30.0 cm is 0 rad and the phase at r2=80.0 cm is 3π. What is the wavelength of the wave?
1/3 or 0.33 m
500
What is the charge on the moving particle?
Positive
500
You and a friend go to an aquarium and you see your favorite fish: an angelfish. Even though the angelfish looks like it is about 3 feet away from you, you know it is actually ________ because you aced your college physics optics exam.
Farther
500
A loudspeaker on a pole is radiating 175 W of sound energy in all directions. You are walking directly toward the speaker at 0.53 m/s. What is the sound intensity level when you are 45 meters away?
I = 68.77 W/m^2
500
An opera singer in a convertible car sings a note at 483 Hz while cruising down the highway at 120 km/h. What is the frequency heard by a person standing beside the road in front of the car?
535 Hz
500
A student has built a 17-cm-long pinhole camera for a science fair project. She wants to photograph her 173-cm-tall friend and have the image on the film be 9.7 cm high. How far should the front of the camera be from her friend?
3.03 m
500
A student in her physics lab measures the standing-wave modes of a tube. The second lowest frequency that makes a resonance is 60 Hz. As the frequency is increased, the next resonance is 100 Hz. What is the lowest frequency that makes a resonance?
20 Hz