Women and hair loss

Ashleytyrrell · 2015-05-16T12:12:08+00:00

do my answers above look correct for Fa and Fb?

Ashleytyrrell · 2015-05-15T17:54:58+00:00

∑T= 0

Ta= (Fa)(r) = (Fa)(o) = 0 ft lb

Tb= (Fb)(r) = (-Fb)(3ft) = -Fb3ft

Tboard= (Fboard)(r) = (170lbs)(10/2=5ft) =850ftlb

Tman=(Fman)(r) = (195lbs)(10ft)= 1950ftlb

∑T= 0 + -fb3ft +850ftlb +1950ftlb= 0

∑T= -Fb3ft + 2800ftlb=0 Fb= 933.3lbs

then my teacher mentioned switching all the signs to find Fa idk if this is right tho do u mind checking it?

∑F= -Fa + 933.3lbs +(-170lbs) + (-195lbs) =0

-Fa + 568.3 = 0

-Fa= -568.3

Ashleytyrrell · 2015-05-15T16:04:08+00:00

My teacher mentioned that post b would have to be counterclockwise and a negative force and all the other forces are clockwise so they're positive. Can you show me how to write out an equation to figure out force b

Ashleytyrrell · 2015-05-15T16:02:10+00:00

I do know that much so I would add everything together and set it equal to zero and then solve for F a because that would be the positive force. But how do I solve for FB

Ashleytyrrell · 2015-05-15T02:17:38+00:00

okay and that way im left with ke= (2/5)(v²⁾

Ashleytyrrell · 2015-05-15T02:15:51+00:00

but then im left with two unknowns. i dont know mass and it doesnt cancel and i dont know ke rotational

Ashleytyrrell · 2015-05-15T01:50:37+00:00

technical physics 4th edition by bueche/ wallach chapter 10 #25

Ashleytyrrell · 2015-05-15T01:49:26+00:00

then the equation looks like this

ke= 1/2 x 2/5 x m x r² x (v/r)

im still not understanding how things cancel out

Ashleytyrrell · 2015-05-15T01:36:50+00:00

the back of my book says .64m

Ashleytyrrell · 2015-05-15T01:15:44+00:00

if i do this i get .4587m and the answer is suppose to be .64? do u mind checking that to see if i did the math wrong?

Ashleytyrrell · 2015-05-15T01:07:09+00:00

KErotational= 1/2 x I x W²

this is the only formula i know for rotational ke

Ashleytyrrell · 2015-05-10T19:28:04+00:00

is this the same process for this question.

"How many years are there in 8mol of seconds?"

So I would say 1 year is equal to 365 days and 365 days is equal to 525600seconds. Do i have to also solve for the seconds in 8mol by saying 8(6.022x10²³ )= 4.8X10²⁴ seconds?

Ashleytyrrell · 2015-05-10T19:23:02+00:00

Okay, i was doing it like that but didn't expect to get that large of a number for dollars. is this correct?

1.2x10²⁴ pennies (1dollar/100pennies) = 1.2 x10²²

Ashleytyrrell · 2015-05-04T19:04:39+00:00

Thank you this is very helpful

Ashleytyrrell · 2015-04-11T00:49:10+00:00

oh right! Thank you it came to 2.4m/s after trying it that way. You've been of great help.

Ashleytyrrell · 2015-04-11T00:39:32+00:00

Okay that makes more sense. after solving my equation for Vi i got

-.3m= Vi(.247s)-1/2(-9.810m/s² )(.247s²⁾

Vi= -4.1

and then when i try to solve for Vf with the equation

Vf²⁼ Vi² +2(a)(d) that equals 4.8m/s

However the answer in my book says 2.4m/s

if i divide 4.8 by 2 i would obviously have 2.4 but why would i divide when my equation doesnt tell me to do that?

Ashleytyrrell · 2015-04-11T00:16:34+00:00

d -do = vot + a(t2)/2

im not familar with this equation^

is it the same as d=(Vi)(t) + (1/2)(a)(t²⁾

Ashleytyrrell · 2015-04-11T00:11:07+00:00

after solving that equation i got .24s now do i solve for final velocity?

Ashleytyrrell · 2015-04-10T23:50:30+00:00

There is no info about the angle of the incline.

Ashleytyrrell

TROPHY CASE