What happens to the period of a simple pendulum motion when it is in orbit inside the International Space Station

An apple is falling from a tree. disregarding air resistance, which diagram shows the free-body diagram of the force or forces acting on the apple?

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

What are similarities and differences between refraction, reflection, diffraction and absorption?