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posted on 02 May 2009
by:anshu chaudhry
posted on 02 May 2009
by:anshu chaudhry
posted on 29 Apr 2009
by:lalit kumar
CBSE Multimedia Animated CD DVD : Free Delivery Dial 01164614067
posted on 28 Mar 2009
by:TopRank India
JUST PASS IT ON..........
posted on 24 Mar 2009
by:anshu chaudhry
posted on 24 Mar 2009
by:anshu chaudhry
posted on 24 Mar 2009
by:anshu chaudhry
posted on 24 Mar 2009
by:anshu chaudhry
posted on 20 Feb 2009
posted on 15 Feb 2009
by:priyannkaa dey
Featured Experiments
An object with density d2 is floating on a liquid with density d1. (d1>d2)
You can drag h3 to add another liquid with density d3 to find out what will happened to the object d2.
You can change density for d1,d2,d3 and height for those two liquid.
Click show P to find out how the pressure changed.
2 Coriolis force
The Coriolis force is a fictitious force exerted on a body when it moves in a rotating reference frame. It is called a fictitious force because it is a by-product of measuring coordinates with respect to a rotating coordinate system as opposed to an actual "push or pull."

This applet simulate particles motions observed from an inertia frame and rotating frame.
The spherical body will rotate when you press "play" button.
The red arrows are velocity vectors at different points on the spherical surface.
Press "jump" to shoot out particles.
You can use mouse to change the 3D view.
3 Vertical Spring (add gravity)
Compare springs with different spring constant.
4 Browian motion
Qualitative evidence of the microscopic nature of gases is shown by an effect called Brownian motion.
5 Calculate Empirical formula
6 Relations between Simple Harmonic Motion and Circular Motion
Here we show the relationship between Simple Harmonic Motion and Circular Motion
7 Boiling & Freezing Point
Here you will learn about boiling-point elevation and freezing-point depression
8 Transmission line calculator

This is a little transmission line calculator applet. A number of the ideas were borrowed from TL.EXE by Dean Straw N6BV. The values of the built in cable attenuations were taken from that program.

To use this applet, change the values in the input fields, and click calculate. Most of the fields should be self explanatory but I'll elaborate a little more below.

To interrupt a calculation in progress, click stop.

The cable type is a menu of common cable types that can be used. In addition two user defined entries allow you to enter custom cable types as described below.

You need to enter the frequency in the first text field. The label "Cable Length in Feet" can be changed to "Cable Length in Meters" which will change all the length units from feet to meters. You then enter the length in the cable length field. Similarly, the "Load Resistance" label can be changed to "Input Resistance" so that measured impedances at the input end of a cable can be converted to antenna impedances. Enter the resistance and reactance (positive for inductive, negative for capacitive) in those fields.

When your input is set, press calculate. If there is an input error a message will be displayed in the field to the left of the stop button. The output side only changes when you press calculate, and will display the characteristic impedance Z0 of the line, the impedance at the other end of the line, the velocity factor, the SWR at each end of the line, the matched loss of the line, and the total loss with your load impedance.

The bottom part of the applet is a plot. The x axis is the position along the line; x=0 is the input. The default shows the power, current and voltage on the line all on one plot. To make them all appear on a single plot, I take the current to have magnitude one at the load, I divide the voltage by the characteristic resistance of the line, and I divide the power by its value at the load. At the top of the plot is a choice menu that allows you to also select the power in watts, voltage magnitude in volts, or current magnitude in amps with 1500 watts input to the line. You can also plot the impedance in ohms seen along the line. The red curve is the resistance and the blue one is the reactance. One of the nice features of this package is that you can zoom in on a portion of the plot by holding down the left mouse button on that portion and move down and to the right to highlight the region with a little square. You can do this multiple times too. If you hold down the left mouse button and move up and to the left, you can unzoom. The easiest way to get back to the original is to click calculate again.

Two user defined cable types are provided. For user 1, you enter the resistive part of the characteristic impedance, the velocity factor and the attenuation in dB/100ft at some frequency. If you want to extrapolate to other frequencies, the exponent would be exactly 0.5 if the loss mechanism were purely conductor losses, and that should be good enough for a first guess. Otherwise, the loss at a new frequency will be the ratio of the new frequency to this frequency raised to the exponent power times this attenuation. The reactive part of the characteristic impedance is calculated assuming only conductor losses.

User 2 does not scale the results with frequency. Instead you input the characteristic impedance both resistive and reactive parts, the attenuation and the velocity factor. These characteristics are assumed to not change with frequency.

9 Two blocks with mass m1,m2 connected by a spring with spring constant k2.Two blocks connected with spring with external force push
Two blocks with mass m1,m2 connected by a spring with spring constant k2.
Drag "hand" in the simulation to push or pull the system (with spring k1) and watch how the system moves.
10 Law of reflection
The law of reflection tell us:
The angle of incidence equals the angle of reflection.
If you change the orientation of the mirror by angle X,
 the angle of incident and the angle of reflection will both change X.
So, the angle of the reflected ray changes by 2X.
You can drag the light source(with mouse) to change the incident angle,too.

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