Physics

Recent Answers

2009-11-06 Physics - Speed:

Because this roller coaster is moving in a circular path Newton's 2nd Law applies: SF=m*a where SF is the sum of all the external forces acting on a system and where the acceleration is centripetal a=v^2/R

2009-11-06 Physics - Time Dilation with acceleration:

What you described above is essentially correct. HOWEVER, you left something out: namely, acceleration. Instead of two clocks on two trains, each train moving away from each other, let's have three clocks

2009-11-06 Physics - Sound uses molecules:

Sound consists of organized vibrations of molecules -- ie, particles with mass. These vibrations propogate at a few hundred kilometers per hour, as each group of molecules pass on their vibratons to the

2009-11-06 Physics - Speed of light:

The limit of light speed is its own speed in a vacuum. When it is different media (air, glass, water), it travels less than its vacuum speed. In a sense, it DOES travel faster in some media than in others

2009-11-05 Physics - Trigonometry:

1. 1/2 = 1-2(1/4) = 1/2 2. a. 12(1/2)-(6/2)(2^1/2) +(2^1/2)/52 = b. (3^1/2)/2 +1 -(3^1/2)/2 +2^1/2 = 1 +2^1/2 3. sin(x) = 4/5, tan(x) = 4/3 4. x/17 = 3/4 so x = 12.75, 17^2 = (12.75^2+y^2)^1/2 so