Recent content by skinofgrey

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    What Time Does a Projectile Make a 30° Angle with the Horizontal?

    Okay, this is just a standard trig problem. since there is no forces affecting the horizontal plane, velocity in the x is a constant. if you wana know when the angle is 30, and you have a constant side. so ( tan(30) ) = ( Vy / Vx ). and the other problem with your equation...
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    Math Methods in Physics, find FODE

    so I'm sorry for the text version but i can help you (Pi = 3.1415blah blah blah) and (P(row) = p) so Pi and p might be confusing but bare with me. (a = acceleration) (G = gravitational constant) i think you can figure out the rest. so (4/3)(Pi)(G)(p)(r) = a and a = (dv/dt) = (dv/dr)(dr/dt)...