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heureka

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 #1
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+5

please help with question 5, thank you.

 

(a)

s(t)=sin(et)v(t)=s(t)v(t)=cos(et)etv(t)=etcos(et)a(t)=v(t)a(t)=et[sin(et)et]+etcos(et)a(t)=et[cos(et)etsin(et)]

 

(b)

v(t)=etcos(et)0=et=0  impossiblecos(et)=0cos(et)=0|arccos()et=arccos(0)et=π2|ln()ln(et)=ln(π2)tln(e)=ln(π2)|ln(e)=1t=ln(π2)t=0.45158270529  seconds

 

 

(c)

a(t)=et[cos(et)etsin(et)]|t=0.45158270529  secondsa(0.45158270529)=et[cos(et)etsin(et)]|et=π2a(0.45158270529)=π2[cos(π2)π2sin(π2)]|sin(π2)=1a(0.45158270529)=π2[cos(π2)π21]|cos(π2)=0a(0.45158270529)=π2[0π21]|cos(π2)=0a(0.45158270529)=π2(π2)a(0.45158270529)=π2π2a(0.45158270529)=π24a(0.45158270529)=2.46740110027 feetsecond

 

 

laugh

03.03.2016