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Welcome to PHY 121 Blog Help. Here's how it works. For each homework question and lab report we will make a post, this will probably contain a few tips on what the problems are about and how to solve them. If you are stuck on something then instead of emailing us directly you should post a comment in reply to the relevant post. We will try to guide you through tough points and help you understand the problems and the concepts behind them.
3 comments:
Can someone help me? I can't figure out what I am doing wrong. In my equation t=11s, m=1200kg v-26m/s. I figured KE1= 0 since v1=0. KE2=405600J since v2=26 m/s, m=1200 kg.
I figured PE1 and PE2=0 since no horizontal distance is travel. Power=Change in Work/ Change in time, so I took (KE2-KE1)+ (PE2-PE1)/t. Therefore P=36872.72. I put my answer in as 37000 and was told try again. Can someone please explain what I am doing wrong?
I don't know if you necessarily have to calculate all the changes. I just used the equation P = W/t = Fd/t. F = ma which is just 1200 x (26/11). D = v(avg)t which is (0.5)(26) x 11. And t is just 11.
I did P=W/T
W=Ef-Ei=mvf^2/2 - mvi^2/2
=1100(33^2)/2 - 0 =
=598950 /11(time) and i get 54450 I also did it the same as the last post suggested and i got the same # but it keeps saying try again help please
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