What is focal plane of a spherical mirror?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?