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A 77.1 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.43 m. What is the work done on the man by the gravitational force?
Find the speed an alpha particle requires to come within 2.6 ? 10-14 m of a uranium nucleus
Suppose an object is placed 6 cm in front of a lens that has a focal length of 4 cm. Where is the image located? What are the magnification and the character of the image
Two converging lenses, each of focal length 14.5 cm, are placed 59.2 cm apart, and an object is placed 27.4 cm in front of the first. Where is the final image relative to the second lens formed
A transistor to be used in a circuit is rated for a maximum current of 30 mA if operated at 9.0 V.c What is the maximum acceptable power to the transistor
A bird watcher meanders through the woods, walking 0.496 km due east, 0.754 km due south, find the magnitude (in kilometers) of the bird watcher's displacement.
Two musicians are comparing their clarinets. The first clarinet produces a tone that is known to be 442Hz, If the second clarinet produces a higher pitched tone than the first clarinet, what is the second clarinet's frequency
A cart for hauling ore out of a gold mine has a mass of 425 kg, including its load. Calculate the work done on the cart during the process by friction
An electromagnetic wave in a vacuum has a maximum magnetic field amplitude of 5.67×10?7 T. What is the maximum electric field amplitude of the wave
A pulse travels on a string 8.0 m long and 12 g mass. If the tension in the string is 32 N, how long does it take the pulse to travel the length of the string
you are helping a friend you estimate it takes a force of 1665.5N to draw everything across the level grass at a constant speed. what is the coefficient of friction between the wood board and grass
The plumbing in an old house uses lead pipes (which are now considered hazardous). what is the change in the length of the pipe
A 5.97kg block is traveling on a one-dimensional frictionless surface. The block strikes a second block of mass 5.08kg that was initially at rest, What was the initial momentum of the first block
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