Halliday, Fundamentals of Physics, 10e PHYSICS FOR SCIENCE AND ENGINEERING (PHYS

Question

Halliday, Fundamentals of Physics, 10e PHYSICS FOR SCIENCE AND ENGINEERING (PHYS 2110/212 inthe figure here, a ball is thrown up onto a roof. landng 4.60 s later at heght h-21.0 m above the release level. The bars path just before landing is angled at " 68.0. witn me roof. (a) Find honzontal distance d travels. (Hint: One way is to reverse the motion, as if s on a video.)What are the (b) magnitude and (c) le (relative tothe horizontal) of the bar's initial veloc (b) Number (c) Number All Rights Reserved. A Divisien of Jon Wey &.ons. Inc.

Explanation / Answer

From

Y=Yo+Voyt-(1/2)gt2

0=21+(VoSin68)*4.6-(1/2)*9.81*4.62

Vo=19.4 m/s

Vox=19.4Cos68=7.267 m/s

Horizontal distance

X=Voxt =7.267*4.6

X=33.43 m

b)

Vy=Voy+gt=-19.4sin68+9.81*4.6

Vy=27.14 m/s

Magnitude

V=sqrt(7.2672+(27.14)2)

V=28.1 m/s

c)

Direction

o=tan-1(27.14/7.267)=75o

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