An ideal gas at absolute temperature t is in a uniform gravitational field with acceleration due to gravity g in the negative z-direction. (a) by considering the gravitational potential energy of a molecule, derive an expression for the density of molecules n(z) as a function of height z. (b) how does your expression for n(z) compare with that obtained by writing the condition of hydrostatic equilibrium for a slice of the gas located between heights z and z + dz?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates

Which of the following is the largest disadvantage of about half of the electricity in the united states comes from burning