What are the steps to extract metal from the earths crust

An atom has seven protons, eight neutrons, and six electrons. What type of electrical charge does it possess?

A certain ohmic resistor has a resistance of 40 Ω. A second resistor is made of the same material but is three times as long and has half of the cross-sectional.

I am sitting on a train car traveling horizontally at a constant speed of 50 m/s. I throw a ball straight up into the air. Describe the motion of the ball as I see it.

A red car of mass m is heading north (direction 0°). It collides at an intersection with a yellow car of mass 1.3m heading east (direction 90°). Immediately after the collision, the cars lock together and travel at in direction 42°.

What is the metric unit of force? kg kg/cm^3 kg/cm^2 N

Which of the following represents a concave lens

A train travels at a speed of 30 miles/hour and traveled a distance of 240 miles. How long did it take the train to complete its journey?

Which statement best describes how waves carry energy? A. Energy moves from one place to another through the wave. B. Energy increases as it moves through the wave. C. Energy is completely consumed by the beginning of the wave. D.

What forces act upon an object dropped in a vacuum

If Galileo's experiment did not measure the speed of light, what did it measure?