I want to know the solution of b) and c).

it would be kevlar ^^

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

not too sure thinking all accelerations are pointed down