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Conceptual Physics 
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#73
May3010, 11:18 PM

P: 71

Now 2



#74
May3010, 11:23 PM

P: 71

I guess if there are people watching this they are laughing haha.



#75
May3010, 11:24 PM

P: 43

if i get a 0 in between the parentheses can i multiply it by 1/2



#76
May3010, 11:25 PM

P: 71

That's why I corrected my mistake... I forgot the K of the integral 


#77
May3010, 11:26 PM

P: 43

sweet



#78
May3010, 11:32 PM

P: 43

d=.06780672



#79
May3010, 11:45 PM

P: 43

Thank you for the help, i will try again tomorrow.



#80
May3010, 11:46 PM

P: 71

AAh you really want me to get my pencils out to resolve that eh ? :P



#81
May3110, 04:55 PM

P: 43

Ok! So after reworking the problem with different numbers this is what i did and the problem i needed to resolve:
A ball rolls off a shelf which is 2.8 meters high. If it leaves the shelf with a horizontal velocity of 6 m/s, calculate the distance from the base of the shelf at which the ball will strike the ground. first i used Dvert=1/2at^2 so, 2.8=1/2 x 9.81 x t^2 solving for the time the time it would take the ball to hit the floor. after square rooting it took aprox .75s to fall. using Dhoriz=Vot D=6 x .75 the distance from the base at which the ball will strike the ground is 4.53m! There is only one other problem I am unable to resolve.... taking a trip you travel 63mph for 30 min, 22mph for 45 min and stop to eat for 20 min. What is your average speed for the entire trip? what i keep doing is adding the speeds and averaging them, 63+22+0/3=28.33, this answer is wrong(the computer program for school i am using keeps telling me this) Total time is 95 min=1.55hours, i have tried several different ways and just do not get this problem(it seems easy though!)edit+ 85/1.55 =54.83 If you or someone could show me how to approach these types of problems dealing with different speeds over time that would be great. Thanks again proc! 


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