Recent content by Noctix

Homework Statement The human eye is sensitive to light of wavelengths from about 400 to 700nm. What range of frequencies does this range correspond to? Take the speed of light to be 3.00 x 10^8 m/s. Homework Equations f=v/lambda The Attempt at a Solution 3.00 x 10^8 / 400,000m =...

sorry, i don't quite understand what you're saying. If we use t=0, the period is canceled out of the equation, isn't it? even if not, how do i get an answer out of your two final equations? sorry for being slow... i haven't had trig, so this is all really new to me. also, I should have...

Homework Statement At x = 15.0 cm and t = 2.00 s, the displacement of a traveling wave is 8.66 cm. The amplitude of the wave is 10.0 cm, and its wavelength is 8.00 cm. Assume the smallest positive phase angle. What is its period? Homework Equations y(x,t)=y0sin2pi(x/lambda-t/period)...

Homework Statement [PLAIN]http://img576.imageshack.us/img576/6328/physics2.jpg Homework Equations KE(final)/Ke(initial) The Attempt at a Solution 1/2mv2/1/2mv2 v(final)2/v(initial)2 v= wr r(initial)=? and r(final)=? I originally thought the r's would cancel, but...

I drew a picture of the problem. Please help, I really need it. :( [PLAIN]http://img219.imageshack.us/img219/2420/physicsm.jpg

Homework Statement A 1.0- kg mass is attached to a string wrapped around a shaft of negligible mass and having a 6.0cm radius. A dumbbell-shaped "flywheel" made from two 0.500- kg masses is attached to one end of the shaft and perpendicular to its axis. The mass attached to the string is...

I drew a picture similar to the illustration in my textbook for the other visual people like myself. [PLAIN]http://img718.imageshack.us/img718/3923/physicsg.jpg **My internet shuts down for the night in two minutes, so if anyone responds I will not be able to answer your questions till...

Sorry, that was unclear. I assumed the mass for the biceps would be the mass of the cannonball plus the mass of the forearm because the biceps are exerting force on both. is that fair to assume?

Homework Statement A person with upper arm vertical and forearm horizontal holds a 4.5-kg iron cannon ball. Assume the mass of the forearm and hand is 1.5 kg, with a center of mass 15 cm from the elbow. The center of the cannonball is 32 cm from the elbow, and the force of the biceps is...