How many valence electrons, electrons, protons, and neutrons does silicon have?

What if a wave reaches a type of matter it cannot pass through? Does it just stop moving? If not, where does it go?

If you found a line of volcanic peaks a few hundred miles long in which the volcanoes were progressively older toward one end of the line, what probably created them?

Why is it that when the moon is farthest away from the sun, its the brightest? shouldn't it be the darkest if the earth's shadow blocks out the moon most of the time?

a 150 kg roller coaster is released from rest at the top of a 50 m hill. how fast will it be going if the second hill is 10 m high?

a 205 kg fridge rest on a floor with Us = 0.330. how much forces does it take to set the fridge in motion?

What do we call seismic waves that are transmitted along the outside of earth?

A wave with a speed of 437 m/s has a frequency of 28 hertz. What is the length of the wave?

Which situation is contrary to Newton's first law of motion? An object at rest begins to move when an external force is applied. A moving object has a constant velocity under the influence of balanced forces.

Since you've determined that the power supply is a 700W dual rail, what does that make the maximum output power?

A 2 m length of an aluminum pipe of 240 mm outer diameter and 10 mm wall thickness is used as a short column to carry a 640? centric axial load. Knowing that? = 73? P? and? = 0.