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A 47.3-kg skater is standing at rest in front of a wall. Bypushing against the wall she propels herself backward with avelocity of -2.41 m/s. Her hands are in contact with the wall for1.19 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the signof your answer.
imagine the water is in freefall as it drops. What charge must be on each plate.
If the filter should process all the water in the tank once every 3.0 h, what should the flow speed be in the 3.0-cm-diameter input tube for the filter
When responding to sound, the human eardrum vibrates about its equilibrium position, what is the frequency (in Hz) of the eardrums vibration
An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 949 N. The coefficient of static friction between the box and the floor is 0.34.
Two mirrors are at an angle of 45 degrees to each other. A light beam strikes the bottom mirror (which is horizontal) at an angle of 60 degrees: At what angle theta is it reflected from the second mirror
An object 25 cm from a convex mirror is observed to produce an image 13.6 cm behind the mirror. What is the focal length of the mirror
Calculate the rotational inertia of a wheel that has a kinetic energy of 24,400 J when rotating at 641 rev/min
A young male adult takes in about 4.46 x 10-4 m3 of fresh air during a normal breath. Fresh air contains approximately 21% oxygen. find the number of oxygen molecules in a normal breath
A long straight thin round conductor carries a linearcharge density λ=7 μC/m. What is the electric field in the region outside the conductor.
A 1.5 kg copper block is given an initial speed of3.00m/s on a rough horizantal surface. Because of friction, theblock finally comes to rest. what happens on the remaining energy
A rotating wheel requires 5.00 s to rotate 26.0 revolutions. What is the constant angular acceleration (in rad/s) of the wheel
A small metal bead, labeled A, has a charge of 29nC . It is touched to metal bead B, initially neutral, so that the two beads share the 29nC charge, What is the charge qA and qB on the beads
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