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A woman who can row a boat at 5.1 km/h in still water faces a long, straight river with a width of 6.4 km and a current of 3.5 km/h. Let i point directly across the river and j point directly downstream. If she rows in a straight line to a point directly opposite her starting position,
(a) at what angle to i 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 her starting point?
(d) How long (in hours) if she rows 3.8 km up the river and then back to her starting point?
(e) At what angle to i 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?
How much work did movers do (horizontally) pushing a 150-{rm kg} crate 10.6 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50.
A parallel-plate capacitor with air dielectric has a plate area of 75cm^2. if the capacitor is fully charged by a 300-v source and can hold a charge of 7.5x10^-9c, what is the distance between the plates
Standing on the surface of a small spherical moon whose radius is 6.75·104 m and whose mass is 6.71·1018 kg, What maximum height above the surface of the moon will the rock reach
A 80.0 Hz generator with an rms voltage of 150 V is connected in series to a 3.20 k ohm resistor and a 3.50 micro farad capacitor. Find the phase angle between the current and the voltage
A cable is lifting a construction worker and a crate, as the drawing shows. What is the tension in the cable above the worker
a crowbar 2m long is used to lift a rock 800n. if the fulcrum is 0.25m from where the crowbar touches the rock, how much effort must be applied to move the rock
The unpolarized light of intensity I(not) is passed through two polarizers with axes oriented at 30degrees from each other. What intensity of light emerges
Find the magnetic flux through a circular loop 4.6 cm in diameter oriented with the loop normal at 58 degrees to a uniform 80 mT magnetic field
A thermos contains 159 cm3 of coffee at 93.7 °C. To cool the coffee, you drop two 13.2-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the..
If I eat 500g of something which is 700Bq/kg, with a half life (biological and physical) of 55 days, what is the dose and effective dose on someone who is 70kg.
A supersonic jet passes directly overhead at an altitude of 12,930 m, traveling at 680 m/s, or mach 2. How much time elapses before you hear the sonic boom
A certain light truck can go around a flat curve having a radius of 150 m with a lowest speed of 38.0 m/s. With what maximum speed can it go around a curve having a radius of 87.0 m.
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