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A barefoot field-goal kicker imparts a speed of 21 m/s to a football initially at rest. If the football has a mass of 0.3 kilogram and the time of contact with the ball is 0.011 second, find the force exerted by the ball on the kicker foot?
Answer in units of N.
A painter (m=70 kg) is standing a distance of 0.6 m from the top of a ladder (mass 40 kg and length 2.5 m). Find the conditions for static equilibrium of the ladder with the painter on top
A straight wire rests on a level surface and is oriented along the east-west axis. A compass is placed above the wire and parallel to the surface. When a current flows in the wire eastward, in what direction will the north end of the compass point?
An inductor has the form of a coil with 2050 turns and a diameter of 1.7 mm. The inductor is placed in a magnetic fieldperpendicular to the plane of the coil and increasing at a rate of0.46 T/s. The current in the inductoris zero at t = 0, and then i..
a golfer lines up for her first putt at a hole that is 18 m exactly northwest of her balls location. she hits the ball
question1two boats each capable of moving in still water at a constant velocity v 6 ms place out to cross a river of
q1. in a photoelectric effect experiment 325 nm photons strike a cathode that has a work function equal to 1.25 ev.
You throw a ball vertically upward from the edge of the roof of the Bisdorf building with a speed 15.0 m/s. Find a) the position and velocity of the ball 1.00 s after leaving your hand.
A converging lens has a focal length of f = 22 cm. If an object is placed 42 cm from the lens, where will the image be formed
Four rays of light are incident on a surface of water. Their angles of incidence are 20, 30, 45, y 60 degrees. Calculate the angle of refraction for each ray
The speed of the block at the bottom of the track is vA = 13.1 m/s, and block experiences an average frictional force of 7.00 N while sliding up the track.
A certain lightbulb has a tungsten filament with a resistance of 18.9 ? when at 20.0°C and 139 ? when hot. Find the temperature of the hot filament
A train is travelling up a 5 degree incline at a speed of 2.2 m/s while the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did last car travel before mom..
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