Find initial speed of ball if air resistance is negligible
Hakeem throws a 8.5 g ball straight down from a height of 2.0 m. The ball strikes the floor at a speed of 7.9 m/s. What was the initial speed of the ball? Assume that air resistance is negligible.
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A piece of Nichrome wire has a radius of 5.50 10-4 m. It is used in a laboratory to make a heater that dissipates 3.00 102 W of power when connected to a voltage source of 120 V. Ignoring the effect of temperature on resistance, estimate the nece
A potter's wheel having a radius 0.53 m and a moment of inertia 14.8 kg·m2 is rotating freely at 52 rev/min. The potter can stop the wheel in 6.0 s by pressing a wet rag against the rim and exerting a radially inward force of 65 N. Find the
What is your opinion on healthcare in the United States? Is it adequate? How can healthcare delivery be improved in the United States? Consider private and public health delivery options. 150 to 300 words required.
Compare and contrast the two types of totalitarian governments that arose after 1917, that is, communism and fascism. What were the origins of these governments, their accomplishments, and their failures? What accounts for the fact that the m
The ball strikes the floor at a speed of 7.9 m/s. What was the initial speed of the ball? Assume that air resistance is negligible.
A gauge-12 wire has diameter centimeters and length meters. When the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per cubic meter.
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You would like to eliminate the reflected light from a flat glass pane for perpendicularly incident light of wavelength 675 nm. If the index of refraction of the glass is 1.50 and you have a coating material with an index of refraction of 1.30, w
A non-uniform bar 5 meters has a center of gravity 1 meters from the heavy end. If it is placed on the edge of a block 1 meters from the light end and a weight of 1497 N is placed at the light end of the bar, it will be balanced. What is the weigh
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