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A force of 15 N applied to a spring stretches it by 4cm. What is the potential energy of the spring in the stretched position?
A floodlight with a mass of 20.0 kg is used to clarify the parking lot. The floodlight is supported at the end of a horizontal beam that is hinged to a vertical pole.
An electron in the hydrogen atom jumps from a level in which the energy is 1.89 eV higher than the energy of the final lower-energy level. What is the frequency of the light emitted in this transition
Assume the charge on black hole is 5740 C. At what distance from it is the electric potential equal to 1100 V.
A 956-kg satellite orbits the Earth at a constant altitude of 92-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 205 km?
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
A 2.00-mol sample of hydrogen gas is heated at constant pressure from 302 K to 414 K. Calculate the increase in its internal energy
q1. a man lifts a 22.4 kg bucket from a well and does 6.7 kj of work. the acceleration of gravity is 9.8 ms2.how deep
Two blocks are in contact on a frictionless table. A horizontal force F is applied to m1. If m1 = 1.66 kg, m2 = 3.72 kg, and F = 6.25 N, find the magnitude of the force between the two blocks
the sound from a church organ revertebrates for many seconds after the organ stops producing sound due to reflections
an electron initially traveling at a speed of 105ms enters a region where there is a uniform magnetic field of 2t
Three radio-equipped plumbing vans are broadcasting on the samefrequency f0. Van 1 is moving east of van 2 with thespeed v, What is the frequency of each van as received by theothers
A 1200kg car (A) traveling due north at 25m/s collides with a 2000kg truck traveling due west at 18m/s. What is the velocity of the wreckage just after the collison
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