One end of a uniform chain of length $L$ is fixed at the top of a smooth sphere of radius $R$ ($L < \pi R/2$). The chain is released at time $t=0$.

1 What is the acceleration $a$ of each element of the chain immediately after it is released?

2 In which point of the chain its tension $T$ reachs its maximum value immediately after it is released?

Additionally calculate answers for
$$
L=\frac{2 \pi R}{6}.
$$