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#1 (permalink) | |
Music Addict
Join Date: Mar 2009
Posts: 1,711
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#2 (permalink) |
Partying on the inside
Join Date: Mar 2009
Posts: 5,584
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Well displacement is actually velocity over time (d = v/t) if I remember correctly, but that's one dimensional. The problem has both the x and y dimension, and is asking for the components of the vector, which the vector would be a diagonal line. I would need to figure out the x component and the y component that made the resultant vector.
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#3 (permalink) | |
Music Addict
Join Date: Nov 2010
Location: hairball cluster
Posts: 326
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. . .
Last edited by skaltezon; 02-07-2012 at 07:30 PM. |
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#4 (permalink) | |
Music Addict
Join Date: Mar 2009
Posts: 1,711
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Using the equation: y=v*t+.5*a*t^2 where: y = vertical displacement v= velocity t= time a = acceleration and figuring out that t=7 you have: 0 = v*7+.5*(-9.8)*7^2 which got me v= 34.3 m/s have no idea if that's actually right though |
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#5 (permalink) | |
Partying on the inside
Join Date: Mar 2009
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Seeing the equation written that way (instead of the way my professor wrote it) makes things a lot easier. It's just a matter of plug and play then.
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#6 (permalink) | |
Music Addict
Join Date: Mar 2009
Posts: 1,711
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Here's the list I got it from in case you don't have them all: Horizontally Launched Projectile Problems |
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#7 (permalink) |
Music Addict
Join Date: Mar 2009
Posts: 1,711
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Ok a little heads up I noticed with the dumb google calculator
tan(20 degrees) is actually equal to 0.36, not sure why google calculator was giving me that other number. But the steps are the same. So the first answer is actually something like 27. And yes you're answer looks right |
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#8 (permalink) |
Partying on the inside
Join Date: Mar 2009
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Oh, one more thing about trig real quick. If I want to find the angle of a right triangle, I know I need to use inverse sin, cos, or tan.
Walk me through the steps of finding the angle of a right triangle whose hypoteneus is 5 units, and whose opposite side is 7 units.
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#9 (permalink) | |
Music Addict
Join Date: Mar 2009
Posts: 1,711
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It's basically just the reverse, there's no steps involved, unless it was values used on 45-45-90 triangles or 30-60-90 Plus what skaltezon said LOL |
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#10 (permalink) | |
The Music Guru.
Join Date: Jun 2009
Location: Beyond the Wall
Posts: 4,858
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edit: damn, I was too slow ![]() |
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