There are 8 elements that together make up 98.5% of earth crust oxygen 46.6% aluminum 8.1% iron 5.0% calcium 3.6% sodium 2.8% potassium 2.6% magnesium 2.1% and silicon what percentage of earth crust is silicon

13) The frequency of a vibrating string varies inversely as its length. A string 3 feet long vibrates 175 cycles per second. Find the frequency of a 5 foot string.

Consider two vectors A~ and B~ and their resultant A~ + B~. The magnitudes of the vectors A~ and B~ are, respectively, 18.2 and 5.1 and they act at 120◦ to each other.

The activation of clotting factors will be blocked. A The rate of fibrin formation will decrease. B Thrombin will be converted to prothrombin. C The rate of blood clot formation will increase.

An example of an unbalanced force is what

Consider two concentric conducting spheres. The outer sphere is hollow and initially has a charge Q1 = - 10Q deposited on it. The inner sphere is solid and has a charge Q 2 = + 1Q on it. 1) How much charge is on the outer surface

How are mass and weight different? a. Mass is the space an object takes up and weight is the effect of gravity on mass. b. Mass is the amount of matter and weight is the effect of gravity on mass. c.

What were the discoveries of astronomers like Copernicus and Galileo?

A major obstacle to developing good human relations is that

4.) An apartment building is on fire and a guy is trapped on the fire escape ladder. There is a dumpster that is 6.3m away and is filled full of trash, and he is 7m above it.

Calculate the temperature of and power-per-area radiated from a blackbody if the spectral intensity density peaks at (a) gamma rays, λ = 1.50*10-14 m; (b) x rays, 1.50 nm; (c) red light, 640 nm; (d) broadcast television waves, 1.