What are the steps to extract metal from the earths crust

Why do astronauts in orbit in space shuttle seem to float

39. Three 12 a resistors are connected in parallel and then connected to a 6.0 V battery. Find the resulting current. Show your work. This is a two part question. 40. The devices and outlets in each circuit in a household are wired in parallel.

If light needs matter, how doe it move through space? this is my first question.

Why does time slow down near a black hole and stop completely inside it?

Which of the following is a type of vaporization? a. melting b. freezing c. evaporation d. condensation

The net force acting on an insect falling downward at constant velocity is

Which statement best compares the accelerations of two objects in free fall? O The heavier object has a greater acceleration.

A series RCL circuit includes a resistance of 280, an inductive reactance of 508, and a capacitive reactance of 315. The current in the circuit is 0.312 A.

A ray in benzene has a critical angle of 41.8 deg when trying to enter air. What is the index of refraction for benzene?

An elevator has mass 600 kg, not including passengers. the elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 16.0 s, and it is driven by a motor that can provide up to 40 hp to the elevator.