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A person is 1.7 m tall. Where should he place the top of a mirror on the wall so he can see the top of his head? Assume his eyes are 4.5 cm below the top of his head. Find a minimal vertical distance from the level of the persons eyes to the top of the mirror.
a gymnast is performing a floor routine. In a tumbling run she spins through the air, How much time does this maneuver take
A fisherman reels in 12.0 m of line while landing a fish, using a constant forward pull of 25.0 N. How much work does the tension in the line do on the fish
Two spherical objects with a mass of 5.26 kg each are placed at a distance of 3.95 m apart. How many electrons need to leave each object
A man is riding on a flatcar travelling at a constant speed of 9.10. He wishes to throw a ball through a stationary hoop 4.90 above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop.
An electron moving along x axis with a constant speed of v = 5x10^6 m/s i enters the region of a uniform electric field, What is the verticle displacement y of the electron 4 ns later
A 4.0-m-diameter playground merry-go-round, with a moment of inertia of 350kg•m2 is freely rotating with an angular velocity of 2.5rad/s. How fast was Ryan running when he jumped on
A 250 g, 40.0-cm-diameter turntable rotates onfrictionless bearings at 61.0 rpm. A 17.0 g block sits at the center of the turntable. What is the turntable's rotation angular velocity when the blockreaches the outer edge
Find the initial compression of the spring so that the block presses the track with a force mg when it reaches the point P [see. Fig], where the radius of the track is horizontal.
a 5kg block is pushed up a frictionless plane inclined at 30 degrees to the horizontal. What fraction of the work done by the force is the dissipated by the friction
A LASIK vision correction system uses a laser that emits 10 ns-long pulses of light, each with 2.5 mJ of energy. What is the average power of each laser pulse
Diagram of the control of an electric heating system. The heater is driven from a voltage-controlled power supply, the voltage V1 being derived from a potientiometer.
a blue car with mass mc 484 kg is moving east with a speed of vc 18 ms and collides with a purple truck with mass mt
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