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A boat, whose speed in still water is 1.70 m/s, must cross a 260-m-wide river and arrive at a point 110m upstream from where it starts (Fig). To do so, the pilot must head the boat at a 45o upstream angle. What is the speed od the river's current?
a bullet is fired through a board 14.0 cm thick with its line of motion perpindicular to the face of the board. if it
question astronauts on a distant planet set up a simple pendulum of length 1.3 m. the pendulum executes simple harmonic
A long straight wire carries 2.4A along the +x-axis. Find the magnitude of the magnetic field at a point 20cm away on the +y-axis
Find out an acceleration of mass and tension in the string
A long, straight conducting wire of radius R has a non uniform current density J =J0r/R, where J0 is fix. Estimate the expression for the magnetic field strength inside the wire at radius r
A 73.1-kN car is traveling at 70.9 mph when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
A ball with I=(2/5)MR2 is placed on a plane inclined atan angle θ. The plane is accelerated upward (along its direction) with acceleration a. For what value of a does the CM(center of mass) of the ball not move?
A 16.0L tank contains 0.430kg of helium at 16.0?C. The molar mass of helium is 4.00g/mol, How many moles of helium are in the tank
a wide rectangular channel has a slope s 0.02. the bed and walls of the channel are paved with concrete. the value of
1. given the energy range of a radiation source to be 0.5 ev. calculate the same energy range in joules. dont use the
A solid sphere of mass 4.4 kg and radius 0.12 m is at rest at the top of a ramp inclined 15°. Find the sphere's total kinetic energy when it reaches the bottom
A 40 cm telescope has a focal ratio of f/10. a) What is the light-gathering power of this telescope relative to that of a single human eye?
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