On a day wilderness expedition you'll need to heat of water to the boiling point each day. the air temperature will average . you have available canisters of compressed butane fuel, which you'll burn to heat the water. each canister has of butane in it. what is the minimum number of fuel canisters you must bring? the standard heat of formation of butane at is . you'll probably find other data in the aleks data resource.

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

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