speed reading in chicago
physics given me the answer if you guys can .read the text below.?
During a chicago storm, winds can whip horizontally at speeds of 100km/h. If the air strikes a person at the rate of 40kg/s per square meter and is brought to rest.
estimate the force of the wind on a person.
Assume the person is 1.50m high and 0.5m wide. Compare to the typical maximum forces of friction (u=1.0) between the person and the ground, if the person has a mass of 70kg.
help me tell the formula , its a problem in my book i cound find it out , but in the back of the book there is an answer for it and the answer is : 8×10^2 N, Fwin> ffr= 7×10^2 N. but i dont know how to get this answer.
If your area A=1.5*0.5m^2, then the air strikes you with rate of R=40*A= 30kg/s; the constant wind with speed v=100*1000/3600 = 250/9 m/s will drive you with force Fwin=R*v = 30*250/9 = 833.3 N, while to drag you lying on the ground one needs the force Ffric=u*mg= 1*70*9.81 = 686.7 N; thus as Fwin>Ffric the wind would pick you up and carry in the air – cool!
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Speed Reading For Professionals (Paperback) $6.95 Barron`s Business Success books offer useful advice to career-minded men and women who are looking to get ahead in the business and corporate world. Titles touch on all levels of management, marketing, organization, and related business operations. Reading and comprehending a large number of documents and reports—many of them specialized and technical—is a vital task that is intrinsic to fulfilling management and executive responsibilities. The authors of this practical book recommend techniques and exercises designed to increase reading speed dramatically and to retain important information more easily. They also offer tips on methods for comprehending dry and often difficult reading matter. |
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