Moment of inertia
I can't seem to understand moment of inertia. What does it mean and how is it derived ? How does it relate to rotational kinetic energy.
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Force couple supported by line
Hi, I know how to calculate the reaction to a force couple supported by 2 points. But what if it is supported by a line. See example attached. How do I figure the force distribution along the constant...
View Articlelight
Can light affected be affected by noise as other signals? I am not able to figure it out..if I am amplifying the light using some optical amplifier,will there be any effects of noise in it? Regards zakee
View ArticleE-field between two concentric cylinders (not homework)
Hi, I have a question. Suppose you have two concentric cylinders of radii a and b with opposite uniform surface charges, line charges or something to that effect. Now, I know (or was told) that the...
View ArticleParabolic Motion, equation for t
I'd like to know why t= v - u/a will not get me a correct value for t when v= final velocity, u= initial velocity and a=acceleration, when the final velocity of the projectile along the y axis=0.
View ArticleDistribution of mass and angular momentum
If I had two cylinders of equal weight and size, but cylinder one had the weight distributed around an outer radius and cylinder two had it distributed around an inner one, would it change their...
View ArticleExtending hamiltons principle
Hamiltons principle can be used to derive Lagrange's equations IF our coordinates are independent. Thus you pretty much show that for independent coordinates Hamiltons principle is equivalent to...
View ArticleAir Hose & Valve - Maximum Nominal vs Shock Pressure
Hey guys I'm designing an air cannon robot and I need your help determining what valves and hoses i need to get in terms of maximum pressure. Based on my research, the maximum pressure ratings for...
View ArticleHow slow can electron go?
Are we even able to accurately measure speed of electrons, in say electron beam or around atom nucleus, how? Is it true electrons can be slowed down? And if so, then where can we observe the slowest...
View ArticleReason for two tides on Earth
There was a thing that kept me wondering for several years, which no science teacher managed to explain. Why does gravitational pull of the Moon causes two tides on Earth at the same time? Would'nt it...
View ArticleIncident and reflected wave
When my book derives equations for reflection between two media it simply says something like this: Suppose a plane electromagnetic wave meets the boundary between two media. This gives rise to an...
View Articlemomentum and collisions
if a hard sticky mud ball is trown on a wall it sticks to it it is an inelastic collision K.E. is not conserved but here momentum is also not conserved because mud had an initial velocity so initial...
View ArticlePhoton space drive
Hello, another thread had discussed this, and I have been contemplating the idea for a while, whether it would be possible to use photons to propel a spaceship. I did some calculations to see how it...
View ArticleEnthalpy of Vaporization vs. Latent heat of vaporization
I am having confusion with the difference between these two, or are they synonymous terms?
View ArticlePressure Energy Transfer From 1 Tank to Another 1
When I have a full tank of compressed air that I need to move to another tank will it require the same amount of energy that it took to compress it to move it? 2 -- 318 cubic feet (equal volume)...
View ArticleHelp improve my concept of current
I feel like my concept of current is way off. Suppose in a circuit there is a node in which you have a certain amount of charge entering per second. Since charge is quantized, this means you have a...
View ArticleIs it possible to solve spring questions with Calculus?
I found this on a previous thread and someone mentions that you can use calculus to solve it. I already solved it using the law of conservation and got .027816 m or 2.7 cm, but it's driving me nuts...
View ArticleHard Time Understanding Archimedes' Principle.
If I have a body (for simplicity a cube with side d) on a fluid (with density ρ) with its top at a depth h, the force acting on top of it is ma = (h*d*d)*ρ*(g); where g is the acceleration of gravity,...
View ArticleAngular Momentum
Can someone please explain why angular momentum involves a cross product? Why is it r x p and not r . P Why a cross product and not a dot product?
View ArticleElectric field
I am currently reading a book about the electromegnetism. When I went through the introductory chapter, there is a small part that I do not understand clearly. Therefore, I hope that I can seek help...
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