Recent content by btrkun

Homework Statement Is the sun's gravitational pull on the moon greater or less than the Earth's pull on the moon? Well, the sun doesn't steal our moon away, so the Earth must be pulling harder, right? Well, if you do that calculations you will find that it is not true! The sun pulls more...

I'm not an expert at rotational inertia, either (not even very good at it, really). But I do know units for L = I(omega) is kg*m^2/s It sounds to me as if there is a problem with the calculation of omega since it comes out as seconds and not rad/s and as far as i know omega = theta/t =...

bleh, this problem has turned into the bane of my existence... So average speed is v = (delta-x) / (delta-t) To find x I use delta-v? x = (delta-v)(delta-t) x = (vf - vi)(tf - ti) x = (0 -3.8 m/s)(1.8 s - 0) (t = (6.86 m/s^2)(3.8 m/s)) x = -6.84 m It's the same answer, just negative...

Ahhhhhh, okay.uN = ma (0.70)[(180 kg)(9.8 m/s^2)] = (180 kg)a a = 6.86 m/s^2 knowing a, I can figure out t to be t = a/v t = (6.86 m/s^2) / (3.7 m/s) t = 1.85 s x = vt x = (3.7 m/s)(1.85 s) x = 6.84 m x = 7mBetter?

Honestly, I don't know why I typed 308 m/s... I meant to type 3.8 m/s. The only force acting horizontally is u = 0.70 So it's: 0.70 = ma - N ?? If so then how do I find N? mgcos(0) = (85)(9.8)cos(0) = 833?

I see my error. The vf = 308 m/s I'm still kinda lost on the equation bit. I was thinking F=ma Fy = mg-N = 0 Fx = ma -uN ??

Homework Statement It's the bottom of the ninth inning at a baseball game. Score is tied with a runner on 2nd when the batter gets a hit. The 85 kg runner rounds 3rd and is heading home with a speed of 8.0 m/s. Just before he reaches home plate he crashes into the catcher and the two players...