Recent content by phintastic

i don't know the equation for impulse, that's my main problem :P

Homework Statement a sound having a frequency of 264 Hz travels through air at 25.0 C. what is the wavelength of the sound. Homework Equations V = frequency x wavelength The Attempt at a Solution i can't even attempt it because i don't know how temperature affects sound.

im reviewing for my final tomorrow, and there is a question that asks for the impulse experienced if a 70kg person lands on firm ground and stops after jumping from a height of 5m. what equation should i use to solve this?

ok thank you for your help. i forgot my calculator at school, and these trig functions can be tricky devils...

all i need to know is whether or not the following is true: -Cos(x) = Cos(-x) i know that Cos(-x) = Cos(x), but i was just wondering if it was the same as -Cos(x). if anyone could help it would be greatly appreciated at this late hour ;)

oo cute cats! keep them away from that erwin Schrödinger though :P

keep in mind i am just an average high schooler who likes to read, but i was just wondering about something that i couldn't find in books or the internet. i know that the speed of light is 186,390 miles per second, so in turn you would have to travel that many miles to "go" back in time one...