Android or apple, Ik what your gonna pick

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.

Light waves travel than sound waves.