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CBSE Class 12-science Answered

semiconductors
Asked by | 25 Sep, 2009, 08:25: PM
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Answered by | 25 Sep, 2009, 08:34: PM

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CBSE 12-science - Physics
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A dumbbell consists of two masses A and B each of mass m joined by a light rod of length l with mass B attached to a suspension point O by a light rod of length l as shown in figure. Find the minimum required speed with which mass A to be projected horizontally so that the system completes the vertical circular motion.
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if breakdown voltage of each capacitor is 40v ,then maximum applied voltage Vmax will be
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explain
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The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
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which answer is correct and most appropriate with explanation
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