A pair of in-phase stereo speakers is placed side by side, 0.80m apart. You stand directly in front of one of the speakers, 1.2m from the speaker. What is the lowest frequency that will produce constructive interference at your location?
In: Physics
3. (a) Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece's weight. Assuming equal point charges (only an approximation), calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a9.00 mg piece of tape held 1.10 cm above another. (The magnitude of this charge is consistent with what is typical of static electricity.)
5. (a) Two point charges totaling 8.00 µC exert a repulsive
force of 0.100 N on one another when separated by 0.553 m. What is
the charge on each?
smallest charge
largest charge
5(b). What is the charge on each if the force is attractive?
smallest charge
largest charge
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A 0.50-?F and a 1.4-?F capacitor (C1 and C2, respectively) are connected in series to a 18-V battery.
Calculate the potential difference across each capacitor.
Calculate the charge on each capasitor.
Calculate the potential difference across each capacitor assuming the two capacitors are in parallel
Calculate the charge on each capasitor assuming the two capacitors are in parallel.
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In a diagnostic x-ray procedure, 5.25*10^10 photons are absorbed by tissue with a mass of 0.590kg . The x-ray wavelength is 2.00*10^-2nm . What is the total energy absorbed by the tissue? What is the equivalent dose in rem?
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A student makes a short electromagnet by winding 480 turns of wire around a wooden cylinder of diameter d = 3.5 cm. The coil is connected to a battery producing a current of 4.8 A in the wire. (a) What is the magnitude of the magnetic dipole moment of this device? (b) At what axial distance z >> d will the magnetic field have the magnitude 4.7 µT (approximately one-tenth that of Earth's magnetic field)?
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(a) |
Number |
Enter your answer for part (a) in accordance to the question statement |
Units |
Choose the answer for part (a) from the menu in accordance to the question statement CC·mC/m^3C/m^2C/mnCmCμCAA·m^2A/m^2mAA/mA/sN·m^2/CpC |
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(b) |
Number |
Enter your answer for part (b) in accordance to the question statement |
Units |
Choose the answer for part (b) from the menu in accordance to the question statement This answer has no units° (degrees)mkgsm/sm/s^2NJWN/mkg·m/s or N·sN/m^2 or Pakg/m^3gm/s^3times |
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In moving away from Planet Z, a spacecraft fires a probe with a
speed of 0.19 c, relative to the spacecraft, back toward
Z.
If the speed of the spacecraft is 0.50 c relative to Z,
what is the velocity of the probe as seen by an observer on
Z?
c,samedirectionasspacecraft
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By holding a bike wheel (mass m, radius r, so that it rotates freely about its vertical center axis) and standing on a circular platform (a disk of mass M and radius R, free to rotate about its vertical center axis), describe a method to measure your mass using a stopwatch (an interesting balance!). Explain your method using physics equations and manipulations to prove that your method will work
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When a carpenter shuts off his circular saw, the 10.0-inch diameter blade slows from 4452 rpm to zero in 2.50 s .
A) What is the angular acceleration of the blade?
B) What is the distance traveled by a point on the rim of the blade during the deceleration?
C) What is the magnitude of the net displacement of a point on the rim of the blade during the deceleration?
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A ball with a mass of 0.605kg is initially at rest. It is struck by a second ball having a mass of 0.430kg , initially moving with a velocity of 0.220m/s toward the right along the x axis. After the collision, the 0.430kg ball has a velocity of 0.215m/s at an angle of 36.0? above the x axis in the first quadrant. Both balls move on a frictionless, horizontal surface.
What is the magnitude of the velocity of the 0.605kg ball after the collision?
What is the direction of the velocity of the 0.605kg ball after the collision?
What is the change in the total kinetic energy of the two balls as a result of the collision?
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What is precipitate-free zone? How does it form? How to get rid of it? (20 pts)
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Microwaves with a wavelength of 7 cm and sound waves with a wavelength of 7 cm are incident on a
12 cm wide slit. Which of the following is correct?
(a) The diffraction pattern from microwaves and sounds waves is different because the waves have
different velocities.
(b) The frequency of the light is less than that of the sound waves
(c) Both the microwaves and sounds waves have a maximum at about 36 degrees.
(d) Both the microwaves and sounds waves have a minimum at about 36 degrees.
A green laser beam is incident on a pair of narrow slits and an interference pattern is formed on
a distant screen. If the green laser is replaced with a red laser, with everything else the same, the
distance between the fringes will
(a) increase because green light has a longer wavelength than red light.
(b) increase because red light has a longer wavelength than green light.
(c) remain the same because the distance between the slits is doesn’t change.
(d) decrease because green light has a shorter wavelength than the red light.
(e) decrease because red light has a shorter wavelength than the greed light.
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Describe what happens when you try to push a heavy box (> 200lbs) that has been sitting on the floor for some time a) before it starts to move b) right after it starts to move c) if it acquired an acceleration without you pushing it harder, explain why in details using static and kinetic forces of frictions and 2nd Newton
In: Physics
Okay for this question, I obviously don't need a quantity because I dont have any, but how would I approach this question in lab if asked:
"Quantify the scatter (or range) of the three resistance values as a percent of their averages"
I don't know what my answer should look like or what I'm supposed to do with the resistance values
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A beam of sound waves of a specific frequency and intensity is passed from one medium into another, arriving at the interface at an angle that is not perpendicular to the interface. Identify TWO aspects of this sound wave that will be different about this beam now that it is travelling in the second medium compared to when it was in the first medium. Explain your answer.
In: Physics
I have a question that I would like to ask here since I'm not an expert or any near to that. Actually I just came up with this question when I was watching The fabric of cosmos. I couldn't find where I can ask this kind of question. So hopefully this is the right place.
What is the "background" of multiverse?
Let me elaborate a little more what that means clearly. As far as I understand, multiverse is a cluster of many universe and it seems like (well from what I saw in documentary) that bubbles in a cup of soda.
What I am curious is that then what is the mechanism of the background or surrounding, I should say, of the multiverse? Since if multiverse "exists" somewhere, then that means the surrounding has to have some kind of characteristics, such as space-time.
I hope that I explained comprehensibly, and somebody can give some reasonable explanation. Even better, any book recommendation would be appreciated!
Even though I studied physics for 1 year and half, I forgot many of them except curiosity. ;)
In: Physics