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gandalfwiz
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Anybody here good at physics and curious to know how long it takes a speeding Moped to reach Ke$ha?
 2 years ago
 2 years ago
gandalfwiz Group Title
Anybody here good at physics and curious to know how long it takes a speeding Moped to reach Ke$ha?
 2 years ago
 2 years ago

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gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
The moped accelerates uniformly over a time of 5.21 seconds for a distance of 110 meters. I have to a) find the average velocity, b) find the velocity at 5.21 seconds, and c) determine acceleration of the Moped.
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
I'm pretty sure that the average velocity is 21.11 m/s (distance/time), but I'm unsure how to solve the others. Help?
 2 years ago

Broken_Fixer Group TitleBest ResponseYou've already chosen the best response.1
does the moped start from rest?
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
I'm assuming so
 2 years ago

Broken_Fixer Group TitleBest ResponseYou've already chosen the best response.1
My formula chart sez \[\Delta d = v_i \Delta t + \frac{1}{2}a (\Delta t)^2\] and you know d, v_initial, and t, so it's easy to solve for "a" ...
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
average velocity= (u+v)\2=21.21 m\s v=u+at u+v=42.22 m\s
 2 years ago

Broken_Fixer Group TitleBest ResponseYou've already chosen the best response.1
final velocity is pretty fast, can we hope that Ke$ha won't be able to get out of the way of the speeding moped?
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
42.22u=u+at 2u=42.225.21 a
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
lol @ fixer... but your formula is way too intense for me :) I think that there's a way to figure it out without one other than the basics...
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
ravi: what do u and v stand for?
 2 years ago

Broken_Fixer Group TitleBest ResponseYou've already chosen the best response.1
i think ravi is saying that final velocity is twice average velocity (since initial velocity is zero), and than acceleration is (final velocity) / (time).
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
a=(42.222u)\2 u=initial velocity v=final velocity a=acceleration
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
hold on... let me process that information...
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
ravi how'd you get 21.21? My calculations give 21.11
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
sir, it was written by mistake
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
okay, so it is 21.11? and then from there you said that velocity=initial velocity + acceleration * time?
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
and after that was initial velocity + final velocity= 42.22 m/s. Where did 42.22 come from?
 2 years ago

Tomas.A Group TitleBest ResponseYou've already chosen the best response.0
everyone whos good at physics are at physics group
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
no one in the physics group :P
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
distance traveled=(average velocity). time=110
 2 years ago

sunsetlove Group TitleBest ResponseYou've already chosen the best response.2
im glad some one could help u
 2 years ago

Tomas.A Group TitleBest ResponseYou've already chosen the best response.0
20ppl there
 2 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.1
Ravi? Where's u go :(
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
u+v=42.22 vu=5.21 a so adding these equation, we get 2v=42.22+5.21a
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
v=(42.22+5.11a)\2
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
a=(vu)\t if moped started from rest then a=v\t=v\5.11
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
now we have final equation for v v=( 42.22+5.11*(v\5.11) ) \ 2 solving this equation for v, we can find the value of final velocity .
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.0
here average velocity= (u+v)\2
 2 years ago
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