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a river flows from south to north at 5 Meter/minutes. A man on the West Bank of river is capable of swimming at 10 meter/Minutes in still water, wants to take shortest time . In what direction he should move?
The potential difference across a resting neuron in the human body is about 105.0 mV, How much power does the neuron release
The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker.
A stone thrown off a bridge 20 m above a river has an initial velocity 14m/s of at an angle of 45 degrees above the horizontal. At what velocity does the stone strike the water
Starting from home, you bicycle 23km north in 2.5h and then turn around and pedal straight home in 1.5h. What is your displacement for the entire trip
A 10 kilogram block rests on the edge of a spinning merry-go-round (a horizontal spinning disk). Obtain the magnitude of the frictional force which keeps the block from falling off the merry-go-round
A bat flies toward a wall at a speed of5.5m/s. As it flies, the bat emits an ultrasonic sound wave with frequency29.0kHz. What frequency does the bat hear in the reflected wave
When monochromatic light shines perpendicularly on a soap film(n = 1.33) with air on each side, Determine the vacuum wavelength of the light
A high-speed photograph of a club hitting a golf ball. The club was in contact with a ball, initially at rest, for about 0.0028s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 1.8 102 ft/s, find out the average forc..
The crankshaft in a race car goes from rest to 3300{\rm rpm} in 2.7{\rm s}. What is the crankshaft's angular acceleration
Using the equation F=m v^2/r for a force an object in circular motion. Find the radius r of motion of a m=1.6 kg ball travelling in a circular path acted upon by a centripetal force F=7N.
The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. Find out the effective coefficient of kinetic friction between the wheel and the wet rag.
A mechanic pushes a 3.60 x 103 kilogram van from rest to a speed of v, doing 4800 Joule of work in the process. During this time, the van moves 24.0 meter. find the horizontal force exerted on the car
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