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

If you traveled in a car for 45 miles at 30 mph and traveled for 90 miles at 45moh, how much time did your total trip take? show equation.

How is a conductor different from an insulator?

Explain why an electromagnet usally has a core of iron or steel

Set the mass of person one at 10 kg and the mass of person two at 10 kg. The two people may be any distance apart. Note the force between them. This is the initial condition Mass 1 (kg) Mass 2 (kg) Distance (m) Force of Gravity (N)

What is compression A) region of zero pressure in a medium caused by a passing wave B) region of high pressure in a medium caused by a passing wave C) region of low pressure in a medium caused by a passing wave D) Region of high altitude in a medium

Under what condition (s) will an object be in equilibrium? Notice that equilibrium in physics has a broader definition. (A) Only if it is moving with constant velocity. (B) Only if it is at rest.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.