Chrome File Edit View History Bookmarks people window Help 7 Chapter, 788 Enegy

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Chrome File Edit View History Bookmarks people window Help 7 Chapter, 788 Enegy x A Bead sides without Friction C www.webassign Responses/submit?pos 88dep 18055560 For this assignment, you submit number of submissions remsini changes if you submit or change Energy and Conservation of Energy Assignment Scoring Your last submission is used for A bead slides without friction around a loop-the-loop (see figure below)·The bead is released from rest at a height h . 3.20R. (a) what is its speed at point O (use the following as necessary: the acceleration due to gravity 9, and R.) (b) How large is the normal force on the bead at point tits mass is 4.40 grams? magnitude direction Selec Need Help? aMester ee Vew Previous Question Question 9 of 19 View Next Question Home My Assignments Extension Reques

Explanation / Answer

(A)Applying energy conservation,

PEi + KEi = PEf + KEF

m g h + 0 = m g (2R) + m v^2 /2

v^2 / 2 =g (3.20 R - 2 R) = 1.20 g R

v = sqrt(2.40 g R ) ..........Ans

(b) centripetal acceleration,

a_c = v^2 / R = (2.40 g R / R ) = 2.40 g downward

Applying Fnet = m a

N + m g = m a_c

N = m (2.40g) - m g

N = 1.40 m g = 1.40 x(4.40 x10^-3)(9.81)

N= 0.060 N  

direction -> downward

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