Guest stackattack Posted November 22, 2010 Share Posted November 22, 2010 hey guys i'm in Ap physics B and was wondering if anyone could help me out with this problem: Estimate the pressure exerted on a floor by the following. (a) a 53 kg model standing momentarily on a single spiked heel (area = 0.06 cm2) ( a 1545 kg elephant standing on one foot (area = 800 cm2) Quote Link to comment Share on other sites More sharing options...
0 Guest moe.ron Posted November 22, 2010 Share Posted November 22, 2010 Well, the equation you would use here is P = F/A (Pressure = Force/Area) This was like a day topic in Cermak's class - so im not sure what unit you want it in. If it is N/(cm^2) all you would have to do in this case is find the weight (W=mg) so in case a the weight is 530N (assuming g=10 m/s^2). That is the force. Then just plug that into P = F/A. The force is 530N, the area is .06 cm^2. 530/.06 = 8833 N/cm^2. If the answer you want is not in cm^2 (most of the time physics is in meters but im not sure in this case...) you would want to move the decimal place over accordingly, before you divide. Quote Link to comment Share on other sites More sharing options...
0 Guest moe.ron Posted November 22, 2010 Share Posted November 22, 2010 oh and i dont know how complicated your pressure problems get. but F in this case is the NORMAL force. On a flat plane the Weight is equal to the Normal Force, but if you were on a slant, you would have to account for the angle by using the normal force instead. Quote Link to comment Share on other sites More sharing options...
0 Guest moe.ron Posted November 22, 2010 Share Posted November 22, 2010 And sorry to keep adding to this... but upon further investigation - you might want to be in Pascals (does that sound farmilar lol?). That is in N/m^2 so you will need to figure out how many m^2 you have from cm^2. There are 100 cm in a m, so 10,000 cm^2 in a m^2 (100x100=10000). Divide your area given by 10,000 to find how many m^2 you have instead and then plug that number into P=F/A as the A instead of in cm^2 and you will have your answer in pascals. 1 Quote Link to comment Share on other sites More sharing options...
0 Guest stackattack Posted November 22, 2010 Share Posted November 22, 2010 thank you so much! i never would have figured that out haha Quote Link to comment Share on other sites More sharing options...
0 Guest moe.ron Posted November 22, 2010 Share Posted November 22, 2010 haha no problem, your best bet is to check the regents physics reference table for the equations. If you know P=F/A then you have figured out the hardest part of the problem. Quote Link to comment Share on other sites More sharing options...
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Guest stackattack
hey guys i'm in Ap physics B and was wondering if anyone could help me out with this problem:
Estimate the pressure exerted on a floor by the following.
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