3. How many valence electrons are in the outermost energy level of each of the following elements?

a. Helium

b. Lithium

c. Nitrogen

d. Magnesium

A ball is tossed upward to height of 10m and falls back to its original position the total trip up and down takes approximately 2s how long did it rise

Types of problems are generated by resource extraction and usage?

When does a newly forming star have the greatest luminosity?

True/False 12. Toxicologists only work within crime labs.

Two simple pendulum of slightly different length, are set off oscillating in step is a time of 20s has elasped, during which time the longer pendulum has completed exactly 10 oscillations. Find the length of each pendulum.

A submarine that is in the sea what principle is that

1. It takes 26.5 N to pull a 72 kg sled across snow. What is the coefficient of friction? 2. A 565 N rightward force pulls a large box across the floor with a constant velocity of 0.75 m/s. If the coefficient of friction is 0.

A person holds onto an object for 2 minutes, but doesn't move the object. Is work done on the object?

Which two vectors add together to give a resultant with the smallest magnitude, and which two vectors add to give a resultant with the largest magnitude? in each case specify the magnitude and direction of the resultant?

The largest velocity reached by a falling object is its