How Do You Calculate Work Done and Heat Energy Generated by Friction on a Ramp?

[HT3]

Homework Statement

A person pushes a 10.0 kg mass up a 7.60 m long, 20 degree ramp( mu=.170) with a horizontal force of 70.0N. Find the work done by the person and the heat energy generated by friction.
the answer for heat energy i canot get..its supposed to be 150J

Homework Equations

W=Fd
F=ma
P=W/t
v=vo+at

The Attempt at a Solution

[img=http://img80.imageshack.us/img80/4013/helprd8.th.jpg]
a)7.14x70 = 500J
Fx=70N
Fperp=70tan20 ?
Fparalell=70/cos20=74.5N ?

 

[HT3]

please help both of my problems posted are due tommorow worht marks and I am so lost please !