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23 Nov 2019

<DIV>Text Bk: Physics (8th) By Cutnell, Johnson<BR>Problem 13P <BR><A href="http://www.cramster.com/solution/solution/918972" href_cetemp="http://www.cramster.com/solution/solution/918972">http://www.cramster.com/solution/solution/918972</A><BR>The main part i do not understand is step 4 </DIV>

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Chapter 4 #81 Cutnell Physics 8th EditionTheprinciples used to solve this problem are similar to thoseinMultiple-ConceptExample17. A 200-kg log is pulled up a ramp by means of a ropethat isparallel to the surface of the ramp. The ramp is inclinedat 27.8 °with respect to the horizontal. The coefficient ofkinetic frictionbetween the log and the ramp is 0.883, and the loghas anacceleration of 0.746 m/s2. Find the tension intherope.
I have gone through this a million times. Need help.Pleasestep by step with answer.



This is problem #10 in the book College Physics 8th ed by Youngand Geller. The textbook solution given on Cramster is incorrect.The question is as follows:

A wall clock on Planet X has two hands that are aligned at midnightand turn in the same direction at uniform rates, one at4.34×10-2 and the other at 1.51×10-2 . At howmany seconds after midnight are these hands first aligned and nextaligned?

Part A: tFirst=____________s

Part B: tSecond=___________s

I know that the "uniform rate" of each hand is their ω. What Itried to do to solve the problem was to simply add .0434rad forevery passing second and .0151rad for the same time. For examplethe table I made is:

Time passing(s) locationof big hand (.0434rad/s) location of small hand (0151 rad/s)

1s .0434 .0151

2s .0868 .0302

3s .1302 .0453

.........etc.

I did this same thing all the way through 60 seconds and thehands never lined up at the same location. This was a very tediousprocess and I still didn't get the answer. Please help. Thanks.

How do I solve the following problem step by step? and what arethe solution? I am really lost, and do not understand the wholeexercise..

A femtosecond laser generated light pulses with a duration ofonly 100 fs (ie 1.00 · 10-13 s). With an ordinary lens,such a laser beam focused down to a spot with a diameter of 10 μm.Atypicalenergyofalaserpulsefromsuchlasersis1mJ.Supposethatenergyisuniformlydistributedover thelaserspot,andtheeffect isconstantduringthepulse (asquarepulse).

1.Findtheintensity ofthelaser focus.

2. Findtheamplitude,Emax,of theelectricfield infocus.

3.Comparethisamplitudewiththe sizeofthe electricfield actingonanelectronaroundthe nucleus ofa hydrogenatomingroundstate (Hint:thedistance betweennucleusand electronisgivenbythe sizea0 = 5.29 · 10-11m)Whatdoes thecomparison of thelaser'seffectontheatom

4.Thelaser lightatawavelengthof 800nm.Calculatehowmanyoscillationstheelectromagnetic field undergoesduringthepulseduration.Do youthink that thefrequency of such alaserwillbe moreorlessclearlydefined thanitisforamoretraditionallaser,such asahelium-neonlaser?Argumentandexplainyouranswer,please.


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