Recent content by ross moldvoer

i tried solving for a in order to use f=ma

Homework Statement What force is necessary to stretch a spring 48 cm, if the spring constant is 270 N/m? Homework Equations 1/2kx^2 The Attempt at a Solution tried plugging everything into equation and got 31 but it is wrong. Any help would be greatly appreciated

Homework Statement You give a 2.85kg book an initial shove at 2.98m/s and it comes to rest after sliding 3.80m across the floor. Find the coefficient of friction between book and floor. Homework Equations vf^2=vo^2+ad f=ma The Attempt at a Solution 0=2.98+a*3.8 =2.33

so after this do i just plug it into the equation? the answer i get seems high

so after solving for omega i plug it into T=2*pi*r/v? i get 407 when i do this and this seeems a little high

my bad then i get .104

the cylinder's diameter is 900m and i need the radius. 900/2=450. then i did 9.8/450=ω^2=.022, ω=.147 (i had a math error in the previous post, this is what i actually got)

that fixed it. thanks a ton

wow can't believe i missed that. so then 450ω^2=9.8, ω=.133 i converted .9 km to 900 m

i did accidently forget to do 2g instead of just 9.8.

i know that ω = v/r but i do not know v. I guess i am confused about what to do in order to solve for ω.

then what equation should i use to solve for v since i don't know T?

i did 9.8=v^2/6.75, v^2=(9.8)(6.75)=66.15 v=8.13 then i plugged v into the equation i gave above

i don't know the velocity for solving for omega, is this what you meant?

Homework Statement For a 0.90km radius cylinder, find the time for one revolution if "gravity" at the surface is to be 9.8 m/s2. Homework Equations rω^2=a The Attempt at a Solution i tried solving for omega but i couldn't find a solution that i only had 1 variable in it.