Recent content by Noctix

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    What Range of Frequencies Corresponds to 400-700nm Wavelengths?

    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 =...
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    How Do You Calculate the Period of a Traveling Wave?

    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...
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    How Do You Calculate the Period of a Traveling Wave?

    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)...
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    How Do You Calculate Kinetic Energy Changes in Rotational Motion?

    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...
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    How Far Apart Are the Masses on the Dumbbell-Shaped Flywheel?

    I drew a picture of the problem. Please help, I really need it. :( [PLAIN]http://img219.imageshack.us/img219/2420/physicsm.jpg
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    How Far Apart Are the Masses on the Dumbbell-Shaped Flywheel?

    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...
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    What is the Torque Problem in Muscle Mechanics?

    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...
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    What is the Torque Problem in Muscle Mechanics?

    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?
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    What is the Torque Problem in Muscle Mechanics?

    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...
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