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A 65- person stands on a scale in a moving elevator while holding a 5.0 mass suspended from a massless spring with spring constant 1.10 . None of the objects in the elevator is moving relative to the elevator, but the spring is stretched by 6.0 . Is the elevator accelerating, and if so, what is the magnitude of its acceleration? What is the reading of the scale on which the person stands?
A lense with a circular aperture of 1cm in diameter is just barely capable of serperating two objects, What's the wavelength of the light from the two objects
The tuner starts with the tension in the E string a little low, after that tightens it. What is the frequency of the E string while she hears four beats per second.
Two coins, carrying identical charges, lie 1.5 m apart on a table and a coin experiences a force of 2.0 N, How large is the charge on each
what is the magnitude of one of the masses.Vertically polarized light passes through two polarizers, the first at 62rm {^circ} to the vertical and the second at 90 rm {^circ} to the vertical.What fraction of light gets through.
Copper has 8.5×1028 electrons per cubic meter. How many electrons are there in a 25.0 cm length of 12-gauge copper wire, what is the average drift speed of the electrons along the wire
0.160kg of water at 88.0 degrees is poured into an insulated cup containing 0.234kg of ice initally at 0 degrees. Calculate the mass of liquid
solve this problem using either tabulated values from the tables or constant specific heats. Calculate the temperature of the exit stream
Two specks of dirt are trapped in a crystal ball, one at the center and other halfway to the surface, what is the refractive index of the ball
Estimate the thickness of lead shielding needed to reduce the exposure rate 2.5 m from a 5.92x10^11 Bq point source of Cs-137 to 1.0 mR/hr.
A simple model considers a continent as a block (density ? 2800 kg/m3), estimate the height of the continent above the surrounding mantle rock
A parallel plate capacitor has a separation between its plates of 1.0 mm. There is a dielectric with a dielectric constant of 2.1 fi ling the gap. what is the area of one of the capacitor plates
A partly full paint can has 0.42 U.S. gallons of paint left in it. how thick is the layer of wet paint
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