Which two elements have the same number of valence electrons?

a. Barium

b. Silicon

c. Neon

d. Carbon?

What current flows through a 2.62 cm diameter rod of pure silicon that is 23.5 cm long, when 1000 v is applied to it? (such a rod may be used to make nuclear particle detectors, for example.) the resistivity of pure silicon is 2.30 103 ω · m?

What is one example of reusing water? A. Taking shorter showers B. watering the yard in the morning C. watering water with dirty dish water D. Turning off water in the sink while brushing teeth

A 0.80-kg soccer ball experinces an impulse of 25 N x s. Determine the momentum change of the soccer ball.

Action and reaction forces always cancel out. Question 1 options: True False

Why are tyres of formula one is different from four wheels drive?

How big is a wifi pulse signal coming from your router? A) 10 meters B) 15 meters C) 5-10 meters D) 20-30 meters

Imagine you are in a music concert. What different sounds might you hear? How are these sounds made?

Dose aloe Vera grow in the mesa?

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 28 kg. The coefficient of kinetic friction between the knife and the stone is 0.20.

What is the unit for force we use when calculating F=ma?