Why dies the earth move round the sun, and the moon round the earth ?

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Which friction is grater, statical or dynamical ?

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i want to increase my ups back time ,i have added one 12v 68ah battery to my ups but it is not working ,is it possible to make adjustment so that new battery will work.

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What generates seismic waves?

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I want to prepare a frequency generator. the specifications i.e. output requirements are 12V, 1-10A & frequency upto 1K to 5K. Please, inform me with proper circuit dig. & the component values.

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I just want to convert the voltage into current i.e. suppose I have 750V & 1A AC power then I want to convert it into 12V & 62A DC power only difficulty is that I don't want to use the tranceformer. Simply to say, I want to make the step-down without using tranceformer. Please, give me some ideas. And also I want the relation between Magnetic Induction & Weight of the body can be levitated. Or I can say, how much of magnetic induction requires to lift 500gms weight? I am heartily thankful to you.

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Explain what is different between secondary electron image and back scattered electron image?

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How we are getting light from electrical bulb?

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Explain the Principle of Calorimetry ?

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Explain the different parts of the x-ray radiation intensity graph? : quantum physics

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What is Amphoteric ?

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What is the direction of null vector?

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