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A woman who can row a boat at 7.3 km/h in still water faces along, straight river with a width of 6.8 km and a current of 3.3km/h. Let point directly across the river and point directly downstream. If she rows in astraight line to a point directly opposite her starting position,
a) At what angle to must she point the boat and(b) how long (in hours) will she take?
c) How long (in hours) will she take if, instead,she rows 3.8 km down the river and then back to herstarting point?
d) How long (in hours) if sherows 3.8 km up the river and then back to her startingpoint?
e) At what angle to should she point the boat if she wants to cross the river in the shortest possible time?
f) How long (in hours) is that shortest time?
The pressure exerted by a static liquid on a vertical submerged surface is calculated from the reaction:
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You are driving your car and the traffic light ahead turns red. You apply the brakes for 2.5s and the velocity decreases to +4.62 m/s. What is the cars deplacement
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The helicopter in the drawing is moving horizontally to theright at a constant velocity. the weight of the helicopter isW=53800N. What is the magnitude of the lift force
A ball of mass .1kg is dropped from a height =11m above the surface of a triangular block of massM=1Kg. The triangular block is at rest on frictionless table and the kinetic energy is conserved during the collision. suppose the ball moves horiz..
It is found experimentally that the electric field in a certainregion of Earth's atmosphere is directed vertically down. At analtitude of 260 m the field hasmagnitude 60.0 N/C. At an altitude of 190 m, the magnitude is 100 N/C.
A balance beam has two clockwise torques applied, 22N @ 5.5m, and 110N @ 2.4 m. Balance is achieved with a 55N force. How far is that force from the balance point
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