EBK COLLEGE PHYSICS, VOLUME 1
EBK COLLEGE PHYSICS, VOLUME 1
11th Edition
ISBN: 8220103599986
Author: Vuille
Publisher: Cengage Learning US
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Chapter 28, Problem 12P

(a)

To determine

The orbital speed of electron at the ground state of hydrogen atom.

(b)

To determine

The kinetic energy of electron at the ground state of hydrogen atom.

(c)

To determine

The potential energy of electron at the ground state of hydrogen atom.

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A person on horseback is on a drawbridge which is at an angle = 20.0° above the horizontal, as shown in the figure. The center of mass of the person-horse system is d = 1.35 m from the end of the bridge. The bridge is l = 7.00 m long and has a mass of 2,300 kg. A cable is attached to the bridge 5.00 m from the frictionless hinge and to a point on the wall h = 12.0 m above the bridge. The mass of person plus horse is 1,100 kg. Assume the bridge is uniform. Suddenly (and most unfortunately for the horse and rider), the ledge where the bridge usually rests breaks off, and at the same moment the cable snaps and the bridge swings down until it hits the wall. ÚI MAJI A TLA MAJA AUTA (a) Find the angular acceleration (magnitude, in rad/s²) of the bridge once it starts to move. 2.22 Use the rotational analogue of Newton's second law. The drawbridge can be modeled as a rod, with rotation axis about one end. rad/s² (b) How long (in s) does the horse and rider stay in contact with the bridge…
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