fox File Edit View History Bookmark Tools Win Help online Test Chapter 7 x solve

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fox File Edit View History Bookmark Tools Win Help online Test Chapter 7 x solved in Sun 5:35 pM httpss/Nwww.webassign.net/weblstudent/Ass a ost visited nment Responses/submit?dep-15876679ag3 3 Getting started icioud Facebook 3 Twitter W wikipedia Applo Y rahoo News Popular signment Submission or this assignment, you submit answers by question parts. The number of submissions remaining for each queston part only dangeoryousubmit or dhange the answer. signment Scoring our last submission is used for your score. 1. O 2110 points I Previous Answers YF147 P005. A baseball is thrown from the roof of a 26.0-m-tall building with an initial velocity 1 m/s and directed at an angle of 53.1. above the horizontal. of magnitude (a) what is the speed of the ball just before it strikes the ground? use energy methods and ignore air resistance. X m/s (b) What is the answer for part (a) if the initial velocity is at an angle 53.1° below the horizontal? (c) If the effects of air resistance are included, will part (a) or (b ve a higher speed? o The ball thrown upward would be in the air for a longer time and would be slowed more by air resistance. The air resistance would have the same effect on the two balls and they would be slowed the same amount. The ball thrown downward would be in the air for a shorter time and would be slowed more by air resistance. 2 O 6/15 points I Previous Answers YF14 P009. Assume that rical bowl with radius R e of a large A, which is at the s released from rest at mass 0.21 A small rock with

Explanation / Answer

Initial KE of the baseball is:

KEi = 1/2 m v^2 = 0.5 x m x 12^2 = 72 m

PEi = m g h = m x 9.8 x 26 = 254.8 m

from energy conservation

KEi + PEi = KEf + PEf

PEf = 0 since ; h = 0

(72 + 254.8)m = 1/2 m vf^2 =>vf = 25.57 m/s

Hence, vf = 25.57 m/s

b)vf = 25.57 m/s

c)(a)

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