Two students are canoeing on a river. while heading upstream, they accidentally drop an empty bottle overboard. they then continue paddling for 60 minutes, reaching a point 2.0 km farther upstream. at this point they realize that the bottle is missing and, driven by ecological awareness, they turn around and head downstream. they catch up with and retrieve the bottle (which has been moving along with the current) 5.0 km downstream from the turn-around point. (a) assuming a constant paddling effort throughout, how fast is the river flowing? (b) what would the canoe speed in a still lake be for the same paddling effort?
Answers: 2
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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?
Answers: 3
Two students are canoeing on a river. while heading upstream, they accidentally drop an empty bottle...
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