What power should a motor have to perform the task
A skier of mass 72 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him 70 m up a 30° slope (assumed frictionless) at a constant speed of 2.8
(b) What power must a motor have to perform this task?
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The x, y, and z components of a magnetic field are Bx = 0.10 T, By = 0.14 T, and Bz = 0.17 T. A 25-cm wire is oriented along the z axis and carries a current of 4.1 A. What is the magnitude of the magnetic force that acts on this wire?
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A skier of mass 72 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 70 m up a 30° slope (assumed frictionless) at a constant speed of 2.8 (b) What power must a motor have to perform this task?
What is the approximate sampling distribution for the sample proportion ρ^? What are the mean and standard deviation for this distribution? What is the probability that the sample percentage is greater than 80%?
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A psychologist develops a new inventory to measure depression. The population of "normal" individuals has mean score on this test of µ = 55 with σ = 12.
When loaded (the action is elastic), the 100 mm side measures 99.965 mm, and the length has increased 2.5 mm. Determine Poisson's ratio and Young's modulus for the material.
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