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A postal worker pushes a 160 N bag of mail up a 31 degree ramp at a constant velocity. The ramp exerts a frictional force of 30 N on the bag. His push is parallel to the ramp. What is the magnitude of the worker's push?
Motor M draws in the cable with an acceleration of 4 ft/s^2, measured relative to the 200 lb mine car. Determine the acceleration of the car and the tension in the cable. avoid the mass of the pulleys.
Cobalt has a density of 8.9 g/cm3 and molecular mass of 58.9 g/mol. Calculate the magnetic moment of a cobalt atom in Bohr magnetons
q1. an electric field of 8.60 x 107 vm is desired between two parallel plates each of area 35.0 cm2 and separated by
An uncharged 20 F capacitor is connected to a power supply set to 10 V. How much charge flows onto the capacitor plates, how much more charge flows onto the plates
A certain conductor has 7.60 1028 free electrons per cubic meter, a cross-sectional area of 4.00 10-6 m2, Find the drift speed of the electrons in the conductor
The lowest pedal note on a particular large pipe organ has a fundamental frequency of 15.7 Hz. What is the length of pipe between the sounding hole and the open end
A child throws a stone from the top of a 15 m cliff with a speed of 20 m/s. find its kinetic energy and speed when it lands on the ground
It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down, Find the net amount of charge contained in a cube 150 m on edge
In outer space, a constant net force of magnitude 140N is exerted on a 30.4kg probe initially at rest. What acceleration does this force produce in m/s2
A subway train has a sound intensity level of 90 dB, and a rock band has a sound intensity level of 110 dB. How many times greater is the sound intensity of the band than that of the train
The density of charge-carrying electrons in copper is 8.5 × 1028 electrons m?3, its resistivity is 1.72 × 10-8 ?·m, and the drift speed is 2.80 × 10-3 m/s. At what rate must thermal energy be carried off by a cooling medium
Two converging lenses, each of focal length 14.5 cm, are placed 39.1 cm apart, and an object is placed 29.2 cm in front of the first. What is the magnifcation of the system
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