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Assume that the athlete approaches the take-off line from the left with a horizontal velocity of 10m/s, remains in contact with the ground for 0.1s, and take off at a 60oangle with a velocity for 10m/s, determine (1) the vertical component of the average impulsive force exerted by the ground on his foot. (2) the horizontal frictional force. The mass of the athlete is 100kg and the coefficient of kinetic friction (μk) is 0.1.
Was the Ptolemaic model geo- or heliocentric? Explain. How did Ptolemy and others before him account for retrograde motion (epicycle and deferent)? What is the most basic explanation for why this complicated theory could not possibly be correct?
It is desired to project an image of an object four times actual size with a lens of focal length 20 centimeter. Estimate what object distance should be used
at the instant the traffic light turns green a car that has been waiting at an intersection starts ahead with a
An object is 23.2 cm from the surface of a refiective spherical Christmas-tree ornament 5.11 cm in radius. What is the apparent position of the image
The drawing shows a circus clown who weighs 950 N. What is the minimum pulling force that the clown must exert to yank his feet out from under himself
the armature of a simple ac generator has 20 circular loops of wire each with a radius of 10 cm. it is rotated with a
Assume all temperatures to be exact, and neglect significant figures for small changes in dimension. What is the corresponding change on the Fahrenheit scale
A cylinder with a piston contains 0.250 mol of ideal oxygen at a pressure of 2.25x105 Pa and a temperature of 355K. The gas first expands isobraically to three time sits original volume. It is then compressed isothermally back to its original volume,..
you have two capacitors one with capacitance 10.5 of and the other of unknown capacitance. you connect the two
Two point charges, +3.75 µC and -6.05 µC, are separated by 1.21 m. What is the electric potential midway between them
At the same time a stone downward at 10 m/s from the roof of a 60 m tall building another is stone is thrown upward at 35 m/s from street level. What is the velocity of each stone when they cross paths
A 100-W lightbulb has a resistance of about 12 ? when cold (20 ?C) and 140? when on (hot). Estimate the temperature of the filament
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