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Me
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 Posted: Wed Sep 05, 2007 1:28 am Post subject: Question 43 |
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QUESTION 43 OF PHYSICS
Gravity is a conservative force, it only depends on the initial and final positions of the object. hence PE=mgh,
NOT PE= mg* sin 0*h
PE=-WORK
closest answer is CHOICE B |
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Me
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| Posted: Wed Sep 05, 2007 1:29 am Post subject: another answer error Q 43 PHYICS |
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forgot to mention this is for GS 5
if i'm wrong,let me know. thanks |
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admin
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Joined: 08 Dec 2003
Posts: 2176
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| Posted: Wed Sep 05, 2007 5:30 pm Post subject: |
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I don't quite follow your logic.
PE = mgh
| Quote: | | Gravity is a conservative force, it only depends on the initial and final positions of the object. |
To be more precise, gravitational potential energy is dependent on the initial and final vertical positions of an object, thus height h. The distance provided in the problem (5 meters) is said to be along the incline thus it is necessary to calculate the x component of the distance of 5 m which is equivalent to the height h.
Thus h = 5sin30. |
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Guest
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| Posted: Sat Mar 13, 2010 5:01 pm Post subject: |
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| Not related to this question, but the passage calls the truck "he" in the second paragraph. |
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adrianaard2607
Joined: 30 Jun 2011
Posts: 4
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| Posted: Tue Jul 12, 2011 7:21 pm Post subject: |
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| i think the question is vague. it needs to say that the distance on the slanted plane is 5 m (out of the 1.2 km total length). we were given the inclined surface length (1.2km), and then another length (5m) which could be misleading as height. for me, i assume i was careless. |
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