t=3.00, k=225, m=150.0
And therein lies the problem. He's making a sig fig calculation before multiplying √k/m) by t. There's also a discrepancy in the ways we approach what's inside the sine function, thus exacerbating the already-present...
The author of my physics book seems to be a little significant-figure-happy:
m=150.0, k=225, A=.15, t=3.00, δ=π
He does this : -A√k/m)sin(t√k/m)+δ)=-.15*1.22sin(3.00*1.22+π)=-.0907
Whereas I do: -A√k/m)sin(t√k/m)+δ)=-A√k/m)sin(3.67+π)=-A√k/m)sin(6.81)=-.0924
Isn't my way more accurate...
The part I don't get is: "line up your fingers with a so that if you were to close your fingers, you'd be moving towards b"
Do you mean pretend to grasp b? I just don't get how curling my fingers would make my hand move towards b, or anywhere.
I'm learning about cross-products of vectors right now. What I don't get is how the right-hand method of determining the direction of the z-axis (or k, whatever) actually works. I've looked at a couple online explanations and I'm still just as confused. Is there anywhere online that I could...