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April 17, 2014

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physics14
In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.2 multiplied by 10-17 N during the first 2.2 cm of the tube's length; then they move at essentially constant velocity another 43 cm before hitting the screen. (a) Find the ...
Thursday, February 16, 2012 at 8:07pm by jm

physics14
A uniform disk with a mass of 900 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 180-g clod of clay on a point 8.70 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?
Thursday, March 22, 2012 at 2:37pm by opp

physics14
According to the law of conservation of the angular momentum I•ω1 = (I +Io) • ω2 M•R^2/2 • 2•π•n1 = (M•R^2/2 + mr^2) • 2•π•n2 n2= (M•R^2/2 • n1)/ (M•R^2/2 + mr^2) (Hz) where M =0.9 kg, R=0.17 m, n1=18 Hz, m =0.18 kg, r =0.087 m
Thursday, March 22, 2012 at 2:37pm by Elena

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