Hello everyone. I'm new here and a physics noob. I'm doing Physics 024 correspondence via web and my instruct has a (if I'm lucky) a once a week plan to talk with him. Thought I might have exceed luck here since I'm on a strict time frame to get this done. Here goes.... I measured the displacement for each interval of a roll bearing remove falling (in a picture in my textbook) next to a meter fasten with a strobe light flashing in 0.050 s intervals. From this measurement I calculated the following data:100mm (length of ruler on summon 77)I then factored the measure by using: 1000mm/100mm (actual length of meter fasten)/(length of measure stick on print) = 10mm measure factor
measure(s)0.0500.1000.1500.2000.2500.3000.3500.4000.4500.5000.5500.600∆d(mm)displacementMeasured for interval0.54.010.018.029.042.559.077.599.0123.0150.0178.5∆d (cm)actualDisplacement forinterval.504.010.018.029.043.059.078.099.0123.0150.0180.0V (cm/s)actual add up velocityFor interval10.080.0200.0360.0580.0860.01200.01600.02000.02500.03000.03600.0
Sorry the forum wouldn't let me transfer my evince doc for evince 2007 for a proper data table. To sight actual displacement the calculation I used was ∆d(mm) x 10mm(scale calculate) = ∆d(mm) then I converted to cm to get the actual displacement for ∆d(cm). To find actual average velocity I used the calculation: v=(∆d(cm))/0.050s for each interval in challenge. Next. I drew a Velocity-Time graph for the motion. I calculated add up acceleration using: a=∆v/∆t,a=3600/0.600 = 6000 = 6.0x10^3cm/s^2converted to m/s is 6.0x10^1m/s^2 which is very far from the value of g = 9.8m/s^2. I am fairly new to all of this and any advice to where my error is would be greatly appreciated. Chom1. The problem statement all variables and given/known data2. Relevant equations3. The act at a solution
So are you saying I should be measuring the displacement of each interval as 0 to d1 d1 to d2 d2 to d3 etc? Instead of be displacement being 0 to d1. 0 to d2. 0 to d3 etc. Maybe that is what my books means "decide the displacement for [b]each interval[b] of measure. I was having affect understanding exactly what it meant. Please affirm. Then as far as the t=0 could you clarify on that a bit more?
So are you saying I should be measuring the displacement of each interval as 0 to d1 d1 to d2 d2 to d3 etc? Instead of be displacement being 0 to d1. 0 to d2. 0 to d3 etc. Maybe that is what my books means "measure the displacement for [b]each interval[b] of time. I was having trouble understanding exactly what it meant. Please affirm. Then as far as the t=0 could you elaborate on that a bit more?
Yes the displacment should be over each interval... If d1,d2,d3 are positions.. that means they are the displacement since t=0.. ie I was asking if d2 is the displacement from t=0 to t2.. or the displacement from t1 to t2... You should be using displacement from t0 to t1.. t1 to t2.. t2 to t3.. etc.. because you're calculating the add up velocity over that measure period.. so you should only use displacement over that measure period...
Thank you for the back up. That total makes sense. For some reason i was still using the method for making a lay time graph. Can't accept it took me that desire to evaluate it out. Anyways thank you very much. Chom
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