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A high-diver of mass 70 kg jumps off a board 10 m above the water. If, 2 s after entering the water his downward motion is stopped, what average upward force did the water exert on him?
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Question: A single mass m1 = 4 kg hangs from a spring in a motionless elevator. The spring is extended x = 12 cm from its unstretched length. 1) What is the spring constant of the spring? 2) Now, three masses m1 = 4 kg, ...
Question: A nylon rope used by mountaineers elongates 1.30 m under the weight of a 65.0-kg climber. If the rope is 45.0 m in length and 7.0 mm in diameter, what is Young's modulus for this material? The response must be ...
Question: A point charge of magnitude q is at the center of a cube with sides of length L. a) What is the electric flux through each of the six faces of the cube? b) What would be the flux through a face of the cube if i ...
Question: A real image is four times as far from a lens as is theobject. What is the object distance, measured in focal lengths? ____from the lens The response must be typed, single spaced, must be in times new roman fon ...
Question: Somebody on reddit posted a ridiculous picture today of a fly pierced onto a needle of a cactus: Whilst the OP claims the picture to be real, several people doubted the fly could ever reach enough momentum to a ...
Question: A radar station locates a sinking ship at range 17.9 km and bearing 136° clockwise from north. From the same station, a rescue plane is at horizontal range 19.6 km, 156° clockwise from north, with elevation 2 ...
Question: Suppose the emf generated by a coil rotating in a magnetic field is zero at t=0, and increases to its first peak at t0=0.11ms. A) What is the angular velocity of the coil in rad/s? B) At what time (relative to ...
Question: Suppose the distance from the lens system of the eye (cornea +lens) to the retina is 13 mm. (a) What must the power of the lens be whenlooking at distant objects? D (b) What must the power of the lens be when l ...
Jimmy is trying to synchronize two clocks on the roof of two buildings. The master clock is located at (x,y,z)=(0m, 0m, 80m), the slave clock is located at ( 200m, 300m, 30m). When the master clock ticks at t=0 s, it pro ...
Question: Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an imp ...
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