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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?
A ball is thrown upward from a platform 4.0 m high with a speed of 23 m/s at an angle of 37 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
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Two protons that are very far apart are hurled straight at each other, each with an initial kinetic energy of 0.21 MeV, What is the separation of the protons from each other
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. A ray of white light enters the water at an angle of incidence of 80.4°. What is the underwater angle of refraction for the red component of the light?
Sam (85 kg) takes off up a 50-m-high, 10° frictionless slope on his jet-powered skis. The skis have a thrust of 240 N. He keeps his skis tilted at 10° after becoming airborne. How far does Sam land from the base of the cliff.
The hot-reservoir temperature of a Carnot engine with 26.0 % efficiency is 70.0 ?C higher than the cold-reservoir temperature. What is the cold reservoir temp
A steel cable has a cross-sectional area 3.44 × 10-3 m2 and is kept under a tension of 1.53 × 104 N. The density of steel is 7860 kg/m3. Note that this value is not the linear density of the cable. At what speed does a transverse wave move along t..
an electron traveling at 713 ms enters a 0.9 t magnetic field. the angle between the velocity and the field is 90o.
consider the bohr model of the one ecectron atom Be+3, calculate the radius,in nm,of ground state orbital
A system consisting of an ideal gas at the constant pressure of 120kPa gains 800J of heat, Find the change in volume of the system
question what fraction of the power radiated by the sun is intercepted by the planet mercury? the radius of mercury is
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