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A swimmer maintains a speed of .15 m/s relative to the water when he swims directly toward the opposite shore of the river. The river has a current that flows at .75 m/s.
a) What is his velocity relative to an observer on shore?
b) how far downstream is he carried in 1.5 min?
A 0.30 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.20 kg puck that is initially moving along the x axis with a velocity of 1.8 m/s. Find the fraction of kinetic energy lost in the collision
A 2.0kg wood block is launched up a wooden ramp that is inclined at a 35? angle. What vertical height does the block reach above its starting point
A spacecraft is traveling with a velocity of v0x = 4330 m/s along the +x direction. Two engines are turned on for a time of 728 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.74 m/s2.
The nucleus of a hydrogen atom is a single proton. The radius of a proton is approximately 1 fm (1 multiplied by 10âˆ'15 m). What is the approximate volume of a proton
Ray decides to paint the outside of his uncle's house. He uses a 4.0-m-long board supported by cables at each end to paint the second floor. find the force that the right cable exerts on the board
The launching speed of a certain projectile is five times the speed it has at its maximum height. Calculate the elevation angle at lauching
a wave of amplitude ai and wave number ki is incident on the junction of two strings. if the wave number in the second
a large point charge of q 50 microc creates an electric field and an electric potential all around it. a styrofoam
A spring is attached to an overhead beam. If you put a mass of 17 0 g on it, and it proceeds to stretch a distance of 7 cm, What is the magnitude of the downward acceleration
A 2.20-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 4.50sin(2*pi*t), Find the resonance angular frequency of the system
a bell ringer decides to use a bowling ball to ring the bell. he hangs the 7.3kg ball from the end of a 2m long rope.
Unpolarized light with an average intensity of 750.0W/m2 enters a polarizer with a vertical transmissionaxis. What is the orientation angle of the second polarizer relative to the first one
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