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  1. B

    Angular momentum direction

    In 3-D dynamics why is the angular momentum not aligned with angular velocity? Does this mean H = Iw is wrong in 3-D ?
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    Spacecraft Mission Design

    Thanks for a quick reply. I can't find the password in the book. Anybody knows where it is ? Can anyone who has access to it provide me ? Its around 1 mb only.
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    Spacecraft Mission Design

    I got this book(https://www.amazon.com/gp/product/1563470411/?tag=pfamazon01-20) by Charles brown from my institute library. Unfortunately they have misplaced the floppy disk containing Spacecraft Mission Design software- ORBWIN. Can anyone share the software or give me ideas on how to get it ...
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    Implementing digital PID control

    Thanks for replying. i have a simpler query now : Suppose I use a proportional control to drive a motor. Measured rpm = 2000, Required rpm = 5000, Error = +3000. Control signal = K * Error. Now how should I apply this control signal to increase in voltage so as to attain the required rpm ?
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    Why are geosynchronous orbirs in equatorial plane circular?

    Geostationary orbit(s?, can there be more than one geostationary orbit?) are geosynchronous orbits in equatorial plane.So obviously I mean geostationary orbit. Hope I'm right
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    Why are geosynchronous orbirs in equatorial plane circular?

    This isn't a homework problem. Difference between circle and ellipse is that their eccentricities are 0 and (0,1) respectively.That doesn't seem to strike anything to me or am I too dumb ??
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    Implementing digital PID control

    I want to control the rpm of a brushless motor with ESC(Electronic speed controller) using PID control. Suppose my motor is rotating at 2000 rpm detecting using hall sensor setup.Now I want it to run at 5000 rpm.The speed will be controlled by PWM signals generated by PWM module( 16-bit i.e...
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    Why are geosynchronous orbirs in equatorial plane circular?

    Anybody can answer my query ? thanks !
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    any genius answer my question

    I think stars flicker more than planets as they are lot further away.The intermediary medium has varied properties so they appear as blinking.
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    Radio communication

    Excuse my ignorance. What it a tuned antenna,terminal voltage,real energy ? Is range dependent on power comsumption ? thanks for help
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    Kalman filtering

    What is it and where is it used ?
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    Radio communication

    What is the basic concept behind radio communication? How does one vary range in it ?
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    Active pull/push,open collector,three state

    I'm a mechanical engineer starting with electronics.I am unable to understand concepts like pull\push, open collector, tristate etc. Please help me with tips,links,books etc.
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