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 helpful data in the ALEKS Data resource.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?