Carl Lewis, a renowned Olympic sprinter in the1980s and 1990s, ran a 100 m dash that can beaccurately modeled with exponential functionsusing vmax = 11.8 m/s and T = 1.45 s.I Review | ConstaWhat was his speed at t = 6.00 s?Express your answer to three significant figures and include the appropriate units.ValueUnitsSubmitRequest AnswerPart FWhat was his acceleration at t = 6.00 s?Express your answer to three significant figures and include the appropriate units.HAValueUnitsa =

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Answered: I Review | Consta Carl Lewis, a…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter4: Forces In One Dimension

Section: Chapter Questions

Problem 75A

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A dolphin in an aquatic show jumps straight up out of thewater at a velocity of 13.0 m/s. (a) List the knowns in thisproblem. (b) How high does his body rise above the water?To solve this part, first note that the final velocity is now aknown and identify its value. Then identify the unknown, anddiscuss how you chose the appropriate equation to solve forit. After choosing the equation, show your steps in solving forthe unknown, checking units, and discuss whether the answeris reasonable. (c) How long is the dolphin in the air? Neglectany effects due to his size or orientation
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A car can be braked to a stop from the autobahn-likespeed of 200 km/h in 170 m. Assuming the acceleration is constant,find its magnitude in (a) SI units and (b) in terms of g. (c) How muchtime Tb is required for the braking? Your reaction time Tr is the timeyou require to perceive an emergency, move your foot to the brake,and begin the braking. If Tr = 400 ms, then (d) what is Tb in terms ofTr, and (e) is most of the full time required to stop spent in reactingor braking? Dark sunglasses delay the visual signals sent from theeyes to the visual cortex in the brain, increasing Tr. (f) In the extremecase in which Tr is increased by 100 ms, how much farther doesthe car travel during your reaction time?
On October 14, 2012, Felix Baumgartner became the first human being to break the soundbarrier while falling freely. He jumped from a capsule that was lofted by a balloon to analtitude of 127,852 ft (38.96 km). The speed of sound at that altitude is 690 mi/h.(a) Assuming that air friction (drag) is negligible at such altitudes, how far would he haveto fall to reach the speed of sound? (The approximation for the gravitational potentialenergy near the Earth’s surface, Ug ≈ mgy, is accurate to better than 1% even at suchaltitudes. Track units carefully, though!). Draw energy bar charts of your system atthe start of Felix’s jump and when he reaches the speed of sound to support youranswer.(b) Friction is not negligible, even at this altitude. Baumgartner actually reached thespeed of sound at an altitude of 109,731 ft (33.45 km). What fraction of the system’schange in gravitational energy was converted to thermal energy (mostly thermal energyin the air) by the time Baumgartner reached the…
The height s (in feet) at time t (in seconds) of a ball thrown upward from the top of a 192 foot building with and initial velocity of 64 feet per second is given by the function: s(t)=-morning 16t^2+64t+192 a)Find the instantaneous velocities when t = 1 and t = 3. Write your conclusions as complete sentences on the lines provided. b)How long will it take the ball to hit the ground? Write your answer in a complete sentence on the lines provided. c)Find the velocity of the ball when it hits the ground. Write your conclusion in a complete sentence on the lines provided.
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