What element below makes up 71% of the earth's crust?

Alex, who has a mass of 100kg, is skateboarding at 9.0m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s. show that his deceleration is 45 m/s2. show that the force of impact is 4500n

When you wear eyeglasses, the light traveling through the lens refracts? Why? A. The density of the glass is smaller than the density of the air. B. The density of the glass is greater than the density of the air. C.

A 250-turn solenoid with an area of 0.100m2 rotates at 40. Orad/s in a 0.0250T uniform magnetic field that is perpendicular to the axis of rotation.

If an atom loses an electron, why would the resulting particle have a positive charge?

According to scientists, which of these factors would be acted upon by natural selection? A. frequency of alleles B. alleles of a gene pool C. behavior of an organism D. genetic makeup of an organism

The gamma ray released by each decay carries 140kev of energy. find the total energy e released by decays in the 2 hours.

Think of the last five things you read. Now think of a type of reading you havent done recenty have never read. What kind of pattern do you see in your reading? What is your favorite type of reading and your least favorite type of reading?

Consider this statement: Air is matter. Which facts best support the statement? A. Balloons can be filled with air. B. Air is essential for life to exist. C. Air has mass. D. Air is not an element. E. To float on air is to be happy. F.

Hydroelectric power uses: wind water coal the sun

Two lightweight metal spheres are suspended near each other from insulating threads. One sphere has a net charge; the other sphere has no net charge. The spheres will: A. Attract each other B. Exert no electrostatic force on each other C.