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chemistry

Write Lewis dot symbols for atoms of the following elements: (a) $\mathrm{Be}$ , (b) $\mathrm{K}$ , (c) $\mathrm{Ca}$ , (d) $\mathrm{Ga}$ , (e) $\mathrm{O}$ , (f) $\mathrm{Br}$ , (g) $\mathrm{N}$ , (h) $\mathrm{I}$ , (i) $\mathrm{As}$ , (j) $\mathrm{F}$ .

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physics

The rate of heat flow through a slab does not depend on which of the following? (a) The temperature difference between opposite faces of the slab. (b) The thermal conductivity of the slab. (c) The thickness of the slab. (d) The cross-sectional area of the slab. (e) The specific heat of the slab.

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physics

A flashing lamp in a Christmas earring is based on an $R C$ discharge of a capacitor through its resistance. The effective duration of the flash is $0.250 \mathrm{~s}$ , during which it produces an average $0.500 \mathrm{~W}$ from an average $3.00 \mathrm{~V}$ . $(a)$ What energy does it dissipate? $(b)$ How much charge moves through the lamp? $(c)$ Find the capacitance. $(d)$ What is the resistance of the lamp? (Since average values are given for some quantities, the shape of the pulse profile is not needed.)