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1001 MCAT Physics- Question 281, 340, and 341
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prabjotpanchhi
#1 Posted : Saturday, July 23, 2011 2:28:56 AM
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I wanted to know if someone could help me out with the above questions. Thanks!
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AndersonMD
#2 Posted : Sunday, July 24, 2011 11:52:03 PM
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281)

sum forces Y = 0 = T1sin(theta1)+T2sin(theta2)-Fg
sum forces X = 0 = -T1cos(theta1)+T2cos(theta2)


T1sin(theta1)+T1cos(theta1)sin(theta2)/cos(theta2)=mg

Solve from there.
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AndersonMD
#3 Posted : Sunday, July 24, 2011 11:56:11 PM
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340)

a) mgh is the energy gained going down the incline so it is work done
b) mgd(sin(theta)) is the same thing as mgh (look at the triangle)
c) 1/2 mv^2 is the kinetic energy gained which must be the same as mgh
d) vtmg that doesn't look like any form of nrg I know, so it is likely wrong (and is in this case)
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AndersonMD
#4 Posted : Sunday, July 24, 2011 11:59:22 PM
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341)

W= Force X displacment = change in NRG

a) change in theta changes h, changes mgh, so changes work
b) d changes work in formula above
c) F= mg, so mass changes force and work done, also changes mgh, 1/2 mv^2 etc.
d) must be correct since all of the above change the NRG
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