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the current in a 30 meter wide river is 3 m/s towards the north. If you need to move straight across the river and you can swim at 4 m/s: in what direction should you head? how long does it take to cross river? how far downstream do you reach the shore?
A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 120 m/s, What is the net force on the rocket
When jumping, a flea reaches a takeoff speed of 1.2 m/s over a distance of 0.46mm, What is the flea's acceleration during the jump phase and How long does the acceleration phase last
How much time is necessary for the torso to come to rest
Illustrate what tangential speed v must the bob have so that it moves in a horizontal circle with the string making an angle 19.0^circ with the vertical?
Light of wavelength 650 nm falls on a 0.48 mm wide slit and forms a diffraction pattern on a screen 1.8 m away.
Find out the work completed by neoconservative forces in stopping plane. At the nozzle exit, diameter is 2.5 cm and the density is 1.29kg/m^3. What is the speed of the air as it leaves the nozzle.
A satellite is circling the earth at 7.26 x 10^6 m with speed 7400 m/s. What is the speed of the second satellite
A plane drops a package of food to stranded caribou on an ice flow in the Artic circle. How far short of the target should it drop the package
A star lying 35pc from the Sun has proper motion of 0.2"/yr. calculate the magnitude of its three-dimensional velocity relative to the Sun
A bird stands on a dc electric transmission line carrying 2800 A. find the potential difference between the bird's feet
A 188.0 g piece of lead is heated to 81.0oC and then dropped into a calorimeter containing 692.0 g of water that initally is at 21.0oC.
A block is at rest on a plank whose angle can be varied. The angle is gradually increased from 0 deg. find the kinetic coefficent of friction between the block and the plank
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