Trouble understanding Riemann Integral and Limits Let p>0. Using Riemann's Integral find the limit. 
Here is the problem :
pic http://www.upload.ee/image/3755496/Riemannintegral.png
The problem is , i don't know how to start or what should i do. 
I can't really understand this chapter from my book and there are no examples ... 
Also calculus books written in english are hard for me to understand , so try to use simple words explaining. 

Recognize the function evaluated at some partition of some interval...
$$\lim_{n\to\infty}\;\frac1n\sum_{k=1}^n\left(\frac kn\right)^p=\int\limits_0^1x^p\,dx=1\;\ldots$$
The first equality above stems from the fact that we know that $\;x^p\;$ is integrable on $\;[0,1]\;$ and thus we can choose the partition and the points in each subinterval as we wish to evaluate the Riemann sums.
