Aparallel plate capacitor has two plates, both have an area of 1.7 m2 and the distance between the plates is 3.9 mm. the relative permittivity of the material between the plates is 9. what is the capacitance value, in units of nanofarads, for this parallel plate capacitor?

remember the permittivity of free space is equal to 8.85 x 10-12 c2n-1m-2 and the formula for a parallel plate capacitor is:

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Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc

If steel is more dense that lake water, why can a boat float