- #1

orbits

- 5

- 0

**A**The magnitude of the kinetic friction acting on the parcel is?

**B**He sends parcel up ramp with initial Kinetic Energy, E, so that by the time, the parcels up the ramp, it has 0 KE. Ramp is length 1.0m.

**C**To give this parcel this initial KE, he most do WORK on the parcel. Assuming he pushed it a short distance of .75m what is the average force he needs to apply. Ignore friction for this part.

*The work I have done is:*

**A**

Y Components: N-MG Cos 30 --> N=150 Cos 30 -->

__N=129.9__

Friction = [tex]\mu[/tex]k * N --> .10 * 129.9 --->

__Magnitude =12.99__

**B**

1/2 M V

_{o}

^{2}+ [STRIKE]MGH[/STRIKE]= [STRIKE]1/2 M V

_{f}

^{2}[/STRIKE] + MGH

1/2 M V

_{o}

^{2}= MGH

H= Sin30 -->.5

1/2 (15) (V)

^{2}= 75

V=3.16

So initial KE = 75 ?

**C**

Is related to B so if that's wrong this is wrong.

Work = Force * Displacement

Work = KE

KE: 75 / Disp: .75 = Force: 100N

Thanks for your help.