OCS 1005 Lecture : OCS Lecture 6 Ocean Basins Intro To Ocean 2015

A .3 kg mass is suspended on a spring. In equilibrium the massstretches the spring 2 cm downward. The mass is then pulled anadditional distance of 1 cm down and released from rest. Write downits equation of motion.

a) y= (.03 m) sin (22.1 t)
b) y= (.01 m) sin (22.1 t)
c) y= (.01 m) cos (22.1 t)
d) y= (.03 m) cos (22.1 t)

<p>Rubidium atoms are cooled to 0.16 &#956;K&#160; inan atom trap. What is their de Broglie wavelength?</p>
<p>I used&#160;&#955;=h/&#8730;(2&#960;mkT)and got 4.698x10^-7 m but it was wrong. Can't figure out for thelife of me what I did wrong. I converted mass to kg from amu, Kfrom&#160;&#956;K, and used the correct constants(6.626e-34;1.38e-23)</p>

W=ΔK+ΔU

W=.5(65)(7.7²-0)+(65)(-9.8)(0-3)

W=3837.925J

W=Fd

F=(3837.922)/(.01)

F=3.8x10⁵

^{The real answer is exactly half of this, why?}