What mass is now necessary to balance the scales
Next, a beaker of water is placed so that the iron block, suspended as above, is submerged in the beaker but not touching the bottom (see the figure). What mass (in kg) is now necessary to balance the scales?
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A proton is initially at rest at a point where the potential is 499 V. Some time later the proton is at a point where the potential is 211 V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy?.
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