Changing components back into general

[themusicman118]

i am having a little problem.

i have the acceleration in the x direction for an object but do not know how to change it back to regular acceleration.

please help

 

[radou]

i am having a little problem.

i have the acceleration in the x direction for an object but do not know how to change it back to regular acceleration.

please help

What exactly do you mean by 'regular acceleration'?

 

[themusicman118]

Amendment to Earlier Question

Sorry, i am new to this. Here is requested info.

Homework Statement

An 80.0 N box of clothes is pulled 20.0 m up a 30.0 degree ramp by a force of 115 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy

Homework Equations

I started by back tracking to find the mass (m=f.w./g)

Then tried to solve for the sum of the forces in the x direction by doing sigma Fx = -Fw,x+Fp,x

I solved for Fw,x by

Fw,x = Fw*sin theta

and Fp,x by

Fp,x = Fp*cos theta

got Fx = -40 + 69.28 = 29.28 N

From Fw,x I solved for a,x with

a,x = ΣF,x/m

a,x = 3.59 m/s2

The Attempt at a Solution

is it

a,x = a cos theta

a = a,x/cos theta

a = 3.59/ cos 30 degrees

a = 4.15 m/s2

??

 

[themusicman118]

please see new thread 'Amendment to Earlier Question'


Thanks

 

[chroot]

themusicman118,

Rather than starting a new thread, please just continue in the same thread you've already created for this question. I have merged the threads together. Please do not create another one.

- Warren

 

[radou]

The change of the kinetic energy of the box equals the work done by all forces along the displacement. Identify the forces acting on the box, draw a free body diagram, and set up the equation of work.

 

[themusicman118]

thanks for the help

will be back in a little while

 

[themusicman118]

Will let you know the results after i receice the homework assignment back on Monday.

 

[themusicman118]

Thanks to everyone who helped out. I turned in my homework today, after staying up till 10:46 last night

 

[themusicman118]

thanks to all who helped