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An optometrist prescribes contact lenses that have a focal length of 50.0cm. Are the lenses converging or diverging? Is the person who wears them near-sighted or far-sighted? Where is this person's unaided near point located if we assume that the above lenses are designed such that objects no closer than 30cm can be seen clearly?
A spinning flywheel has rotational inertia I = 401.0 kg · m2. Its angular velocity decreases from 20.4 rad/s to zero in 261.6 s due to friction
In 1980, over San Francisco Bay, a large yo-yo was released from a crane. What was the tension in the cord on which it rolled
A pendulum of length 1.00 m swings in a vertical plane. Whenthe pendulum is in the two horizontal positions Θ =90 andΘ =270, its speed is 5.00 m/s. find the magnitude and direction of the total acceleration
A thin film of glycerin (n=1.473) of thickness 524 nm with air on both sides is illuminated with white light at near normal incidence. What wavelengths will be strongly reflected
A physics professor demonstrates the Doppler effect by tying a 650 Hz sound generator to a 1.1 m long rope and whirling it around her head in a horizontal circle at 100 rpm.
The avarage intensity of solar radiation that falls normally on surface just outside the earth's atmosphere is 1.4 kW/m^2. What radiation pressure is exerted on this surface
A molecule consists of two atoms. How far from the first atom is the center of mass of the molecule
question a point on the rim of a 0.71-m-diameter grinding wheel changes speed at a constant rate from 11 ms to 25 ms in
Three electrons are placed at the vertexes of an equilateral triangle with side length of 5.1 nm. find the potential energy of this arrangement of charges
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 10° incline. His speed at the bottom is 15 m/s. How long does it take him to reach the bottom
A brick is thrown upward from the top of a building at an angle of 45° to the horizontal and with an initial speed of 10 m/s. If the brick is in flight for 2.8 s, how tall is the building.
If you run the wire between the poles of a strong horseshoe magnet, subjecting 5.00 cm of it to a 1.90 T field (perpendicular to the wire), what force is exerted on this segment of wire
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