Recent content by mode656

In the following circuit, none of the 7 segment LED's light up when i start simulation. I have been told that I do not need to connect anything to the LT, RBI and BI/RBO ports of the 74247 TTL. Does that affect anything maybe?[PLAIN]http://img708.imageshack.us/img708/390/7seg.png

any specific reason why? or is it just so?

don't worry about it. My problem does not lie within my use of the quadratic formula. My question is just pretty much how the book got t^2+80t-400=0 from 100=(20)t+(1/2)0.5t2

i know that's the equation but i need the quadratic formula to solve for time when only acceleration, distance and initial velocity is known

in my book its sets up the quadratic form as t2+80t-400=0 the answer is still wrong i get 10?? it is supposed to be 4.5

Homework Statement Find the time required for a train to reach 100m if V0=20m/s and acceleration is 0.5m/s2 Homework Equations s=v0t+(1/2)at2 The Attempt at a Solution i am not sure of how to go about getting s=(20)t+(1/2)0.5t2 into quadratic form for use in the quadratic formula...

K i don't know why I'm having such difficulty with a question that seemed so easy at first =/ Here is what i have after your suggestions X Axis 200+(cos30*150)=329.9N (pretty sure you don't round until the end) cos35*175= 143N 329.9-143=186.9 Y Axis sin35*175=100N sin30(150)=75N...

kk if i do that i end up with 289N which is still wrong im not sure where i went wrong

Homework Statement Three students push a box. Michael pushes with a force of 200 N at 0 degree. Shannon exerts a force of 150 N at 30 degrees, and Adam pushes with 175 N at 145 degrees. What is the magnitude of the net force? Homework Equations Some trig nothing special The Attempt...

ok ok i got it now its just some simple trig from here thank you

k i don't really get what you mean so here is the question: Jack exerts 30 N and Michael exerts (cos 45 * 40) N at x direction. the net for is calculated by: 30 N + (cos 45 * 40) N = 58.3 N. [E] 0 N + (sin 45 * 40) N = 28.3 N. [N] I can't get the square root to work but you would use the...

Homework Statement Not a specific question really. How would i find the angle of 2 combined forces in 2 dimensional motion. I have the the net force and the forces applied on both the x and y axis

when i find the friction force(FN=-mg or Fn= (-.4kg x-9.8m/s2 i divide the net force by this value? Edit: i think i did lol thanks also i think i forgot a one in the second answer of mine its supposed to be (18.75)

Homework Statement A book has a mass of 400 g. When you slide the book against the floor with 5 N, it accelerated at the rate of -1.5 m/s^2. What would the coefficient of friction between the book and the floor be? Homework Equations Ff = μFN The Attempt at a Solution I am trying to...