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November 01, 2025, 09:52:16 am
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Author Topic: neap 2009 trial exam question  (Read 1522 times)  Share 

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cranberry

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neap 2009 trial exam question
« on: May 19, 2011, 08:47:14 pm »
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ive got a few questions wrong, which the solutions don't explain that well...need some help/explanations :laugh:
i can't select text and copy out the q's here so you'll have to see the exam attached :S (sry :() :coolsmiley:

the q's in order of preference are:

Motion
Q5 (i used -F(sum of) = -mg + Fnormal, and got 22461N...
Q14 (used the period formula T = sqr root(((4Pi^2r^3)/GM)) with 3650000 as radius) got secs then min then hrs (div by 60) way off..

S&M
Q 5
Q 13


thanks heaps VN  :angel:
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onur369

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Re: neap 2009 trial exam question
« Reply #1 on: May 19, 2011, 08:55:25 pm »
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Whats the answer for q 5 ? I got 24600
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cranberry

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Re: neap 2009 trial exam question
« Reply #2 on: May 19, 2011, 08:59:52 pm »
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5640N :(
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onur369

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Re: neap 2009 trial exam question
« Reply #3 on: May 19, 2011, 09:15:59 pm »
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fnet= mg-n
n=mg-fnet
mg= 300x10
Fnet= mv^2/r = 300x144/5 = 8640

3000-8640 = -5640 N.

Thats the best i got
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MissIraq

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Re: neap 2009 trial exam question
« Reply #4 on: May 19, 2011, 09:21:13 pm »
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hey cranberry where are you getting these trials?
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cranberry

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Re: neap 2009 trial exam question
« Reply #5 on: May 19, 2011, 09:22:38 pm »
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ah okay...cool ty man..
i new that for the minimum speed at the top of the circular path Fnet=mg...so when the object is not travelling at its minmun speed Fnet (at top) = mg + Fn ye? ...neap's solutions aren't clear enough
« Last Edit: May 19, 2011, 09:29:33 pm by cranberry »
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onur369

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Re: neap 2009 trial exam question
« Reply #6 on: May 19, 2011, 09:24:18 pm »
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yes
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cranberry

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Re: neap 2009 trial exam question
« Reply #7 on: May 19, 2011, 09:24:48 pm »
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Quote from: MissIraq on May 19, 2011, 09:21:13 pm
hey cranberry where are you getting these trials?

from our teacher, but im sure they are on VN somewhere...

heres solutions from 2009 if u guys want...
« Last Edit: May 19, 2011, 09:28:58 pm by cranberry »
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Master of Civil Engineering and Bachelor of Science at the University of Melbourne

VCE:
2010: Revolutions [36]
2011: English 45, Legal Studies 38, Physics 37, Chemistry 34, Methods 36

94.85
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