Please disregard my notion that problem 19 of chapter 18 in the 8th edition physics book by Cutnell ,Johnson was incorrect. I was very mistaken; too many hours at the computer. My apologies. Thank you, Robert.

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Hello. I need help with the following problem. I have asked forhelp previously and worked through this question and the followinganswers are not correct: (a) 343, (b) 3, (c) 1.81, (d) 686, (e) 2,(f) 3. This question is similar to Chapter 17, Problem 19 of book"Fundamentals of Physics" 8th edition, ISBN 978-0-470-04473-5.Thank you very much for your help.

Textbook: Physics 8e, Cutnell and Johnson
Chap 20 Problem 103

/solution/solution/714716

Question:
In a pacemaker, a pulse is delivered to the heart 81 times aminute.The capacitor that controls this pulsing ratedischarges through aresistance of 1.8*10^6 ohm. One pulse isdelivered everytime thefully charged capacitor loses 63.2% of itsoriginal charge. What isthe Capacitance of the Capacitor?

The equation that you suggest is q= q_o e^(-t/RC)

t =.7404
R=1.8*10^6

So to solve I take the (ln q/q_o) and I get 1.44

So the Capacitance should equal -t/(1.8*10^6)(1.44)

The corect answer in the back of the book is 4.1*10^-7 but whenIwork out the problem I keep getting 2.86*10^-7.

Could you please check the math on this problem and let me know ifIam making a mistake or if the answer given is incorrect?

Thank you so much for your time and help!

I really really need help with this problem....and ifanyonecan "dumb it down" or clearly explain the equations beingused thatwould really help me out.

here is the problem...\

A small 50g block slides down a frictionless surfacethroughheight h=20cm and then sticks to a uniform rod of mass 100gandlength 40cm. The rod pivots around point O (which is at thetop)through angle (theta) before momentarily stopping. Findtheta. Thereis a diagram of this problem in cramster. It is in the Fundementalsof Physics 8th edition by JearlWalker....Chapter 11...number66P.

Thank you so much in advance for putting the timeintoresearching this for me!!!!!

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Please disregard my notion that problem 19 of chapter 18 in the 8th edition physics book by Cutnell ,Johnson was incorrect. I was very mistaken; too many hours at the computer. My apologies. Thank you, Robert.

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