Gallium atoms of mass m = 1.1610 -25 kg are adsorbed from a vapor to a small
Question:
Gallium atoms of mass m= 1.1610-25kg are adsorbed from a vapor to a small horizontal pan attached to a microscopic beam. The beam is attached to a post by a pivot and is inclined above the horizontal, as shown in the figure. The weight of the particles that the pan adsorbs exerts a force F on the end of the beam. The beam was designed so that it does not rotate until the torque about the pivot due to the particles reaches =2.7610-20Nm. The vector extending along the beam from the pivot to the point at which the weight of the particles acts on the beam is r=xi+y j in the coordinate system.
Part (a)What is the direction of the torque that the atoms produce on the beam?
If x=2.6910-6m and y=0.3110-6m, what is the minimum number of gallium atoms necessary to rotate the beam? | |||
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Fundamentals of Physics
ISBN: 978-1118230725
10th Extended edition
Authors: Jearl Walker, Halliday Resnick