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seen Aug 29 at 6:06

Aug
27
comment Calculating new temperature of an object when air temperature changes
However, with a controlled experiment you can estimate the conductivity: Start with a known air and object temperature, respectively. Then take readings of both at regular intervals. The average change in the temperature difference divided by the time interval yields the conductivity. With Fourier's law you can predict the object's temperature.
Aug
27
comment How do you add temperatures?
As long as you stick with one unit, you can interpolate as usual. The average of 400K and 500K is (400+500)/2. Your problem is probably to apply a proper interpolation method. Your 828 degrees are outside of the key value data set, so you need to extrapolate. Maybe you can change the question towards this direction?
Aug
27
comment Why isn't jumping against a wall an elastic collision?
Maybe there is something wrong with the wall. yhgdfg should be more specific about the setup of the experiment. How often did he jump against the wall? Which body parts hit it first? I only want to avoid closing of the question due to insufficient effort.
Aug
26
comment Increase contrast on the image taken by CCD camera
HDR means that you artificially increase the dynamic range (i.e. the range between over-exposed and under-exposed areas of an image) by combining images taken with different exposure times. Bright areas (e.g. sky, clouds) are well displayed on images with a short exposure time, whereas shadowy areas need longer exposure times to reveal details. The combination will show ALL details. So, if your pattern has darker and brighter areas you can simulate a higher sensitivity with low noise.
Aug
26
comment Relationship of multiple particles under collision
You assume that particle 1 reverses its direction after the first collision. This is wrong. Example: A=0.1, B=100.
Aug
26
comment Relationship of multiple particles under collision
I was trying to direct him towards am more focussed question in this homework. momentum = mass x velocity should be helpful.
Aug
26
comment Relationship of multiple particles under collision
Have you tried some scenarios? What if A>B, A<B, A=B? What about the momentums of the particles after first and second collision, respectively? Under which conditions can the particels meet twice?
Aug
26
comment Increase contrast on the image taken by CCD camera
Of course you have to use the lowest possible sensitivity value of your camera. Usually it is 80 or 100. The higher this value, the higher the noise level will be.
Aug
26
comment Increase contrast on the image taken by CCD camera
To increase the signal-to-noise ratio you could create a HDR image. Take a series of pictures with different exposure times and combine them either manually or use a HDR software.
Aug
20
awarded  Editor
Aug
14
comment What are the similarities and differences between speech and music sounds?
@robert You are right, I wanted to make the point that there are no physical differences in the sound production of humans and instruments. Musical instruments are made to sound in a certain way, so they have less degrees of freedom. Wind instruments only work by changing mateuz' point 1, so adding to CuriousOne's comment, I would say we agree on the physical part of the question.
Aug
13
comment What are the similarities and differences between speech and music sounds?
No, we can't. Resonance occurs always in the same way. There are no different types of resonance. Maybe your question is rather:"Why don't humans sound like instruments" (or vice versa)? Answer: Well, some do.
Aug
13
comment Finding equilibrium of mechanical system
Look up the definition of the Euler-Lagrange equations. Then see what your generalized coordinates and velocities are. Insert your L into the E-L equations. Then think about what equilibrium means (the sum of all forces is ...).
Aug
13
comment What are the similarities and differences between speech and music sounds?
Sound is produced by air blowing over obstacles, resonating in a body. So, 1. and 2. are the same. The human body is just a complex instrument (teeth, tonge, lungs etc.) and physically there is no difference in the production of sound waves. (btw. Are you sure harmonicity is a real word?)
Aug
12
awarded  Scholar
Aug
12
accepted Calculate transparency from Beer-Lambert Law
Aug
12
answered Free vs bound vectors and torque
Aug
12
awarded  Student
Aug
12
asked Calculate transparency from Beer-Lambert Law
Feb
7
awarded  Critic