Any Physics Majors Out There

Any physics majors out there...?

If you know the frequency then you can calculate the wavelentght of the sound waves. The speed of sound is 340 m/s

Therefore the wavelenght is found by: velocity = wavelenght x frequency

wavelenght is therefore equal to: wavelength = velocity/frequncy
wavelenght = 340/1000 = .34 meters

Using an equation on wikipedia:
1.2*A1 = Final Amplitude = A1*sin(w(t)) + A1*sin(w(t)) = A1*2* (sin(w(t))

where A1 is the amplitude of each wave. They are identical so I have two fo them.
where "w" is the angular frequency and "t" is the time. youll be solving for w*t..so ddont worrry about the individual values


sin(w(t)) is the structure of the wave. Even thouh its a longitudinal the density of the wave can be represented by sin waves

In the end I just add up the two waves and force the answer to be 1.2 times the amplitude...which is what you are looking for.

w*t = 37 degress

From the angle I guess you could just do simple ratios to get the distance needed.

one wavelenght = .34 meters
At 37 degress you are 37/360 from the begining of the wave. Where 360 degress is a full wavelenght..therefore

x/.34 = 37/360


solving for x
x = .035 meters

And since the sin wave repeates every .34 metets the answer might be


Distance you will need is:
n*.34 meters + .035 meters

where "n" can be any integer number you want. For example....n can be 10. Which would make the distance 3.435 meters

What is the Major tool in Physics?

Imagination.

What is job security like for a physics major?

I started college as a physics major, because I didn't really know what I wanted to do, and I figured that if I could do Physics, I could do anything.

My parents and friends have been pressuring me to switch, because they don't think I'll be able to find a job with it. I've talked to advisers around school, and they all insist that there are plenty of jobs I can go into, but I don't think they're advice is all that helpful, seeing as to how they also insist that History degrees are useful, when all of the History majors I know are unable to find jobs.

Any physics majors here with experience dealing with job searches?

I'm thinking about just switching to Engineering, since it's similar enough that I'll still enjoy it, and I'll at least know that I can find a job with it.

I always fantasized about being a research scientist, but to do that, I'd have to get a graduate degree, and even then, I don't know how good my chances of finding a job are. And if I changed my mind after I graduated, I don't know what I'd do with the undergrad degree on its own.

Physics major? Any genius out there?

if he jumps 0.6m vertically, his speed at the top is zero, and his speed on hitting the ground is v=sqrt[2gh] = 3.43 m/s

this must also be the speed with which he left the ground

a) we can think of this as how long it takes to fall 0.25 m from rest; and we know the total time in the upper 25 cm is twice this

dist = 1/2 gt^2 or t=sqrt[2d/g] = sqrt[2(0.25)/g]
t=0.23 s

since there is the same time going up, the total time spent within 25 cm of apex is 0.46s

b) time in lowest 0.25 m

there are a couple of ways of doing this, one is to solve the quadratic:

y(t) = vot-1/2gt^2
0.25=3.43t-4.9t^2 and solve for t (t=0.08s going up)

so the total time spent in the lowest 25 cm is twice this, or 0.16s

For any engineers/physics majors out there...?

time it takes for it to travel through the air is 4 m / 343 m/s = 11.66 msec

We know that it travels faster through the metal, so if the difference is 11, then tm = 11–11.66 ms

which means the speed through the metal is 4/0.00066 = 6060 m/s


but this is not a good answer, as the speed of sound in air can vary over a large range. And the difference between 11 and 11.66 ms is small.

for example, the 343 number is at 20ºC. At 25ºC it is 346 m/s, which has a travel time of 11.55 ms, and when you subtract, you get 0.55 ms, or a speed of 7330 m/s. So it depends on the exact temperature, which you did not define.

.