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an ideal spring of negligible mass is 120 cm long when nothing is attached to it, when you hang a 3.15 kg object from it, you measure its length to be 13.40. if you wanted to store 10.0 j of potential energy in this spring. what would be its total length? assume that it continues to obey hooke's law
problem 1 a box is lowered by a rope at a constant speed. if its mass is 20 lb its downward speed is 3 fts and the
A light bulb is placed 22.2 cm in front of a concave mirror. Calculate the focal length of the concave mirror
q1. the loaded cab of an elevator has a mass of 3.0 x 103 kg and moves 221 m up the shaft in 23 s at constant speed. at
A long horizontal hose of diameter 3.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1 cm. detetmine the velocity of the water in the hose
The weight of the atmosphere above 1 m2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m3. Calculate where the top of the atmosphere would be
A magnetic dipole with a dipole moment of magnitude 0.0205 J/T isreleased from rest in a uniform magnetic field of magnitude 56.3mT. The rotation of the dipole due to the magnetic force on it is unimpeded.
The activation energy for vacancies in Cu is w.28 eV. Find the fractional number of vacancies at the melting temperature. Estimate the contribution of vacancies to the thermal expansion at the melting temperature.
Laser beam with wavelength 632.8 nm is aimed perpendicularly at opaque screen with two identical slits on it, What are the double slit characteristics (slit width, slit separation)
A 2.8nF parallel-plate capacitor has an air gap among its plates. Its capacitance increases by 4.0nF when the gap is filled by a dielectric. What is the dielectric constant of that dielectric?
The pilot of an airplane travelling 200 km/h wants to drop supplies to flood victims isolated on a patch of land 165m below. The supplies should be dropped how various seconds before plane is directly overhead.
a generator rotates at 85.hz in a magnetic field of 0.030 t. it has 1000 turns and produces an rms voltage of 150 v and
A proton is initially at rest. After some time, a uniform electric field is turned on and the proton accelerates. The magnitude of the electric field is 1.88 multiply.gif 105 N/C.
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