The model below shows a calcium atom. How many electrons are in the third energy level? 2 8 18 20

How does the force of gravity affects an objects acceleration

A machine gun fires 10 rounds per second. The speed of the bullets is 300 m/s. What is the distance between the flying bullets?

How many moles of oxygen are produced when 26.5mol of aluminum oxide are decomposed

An electric iron has a rating of 750w and 220v then calculate the current flowing through it and the resistance

What is the least dense part of the atmosphere?

In a bizarre but harmless accident, a watermelon fell from the top of the Eiffel Tower. How fast was the watermelon traveling when it hit the ground 7.80 seconds after falling?

If an element has the atomic mass (a) of 80 and its atomic number (z) is 35, how many neutrons does it have?

A ball is thrown up into the air with an initial velocity of 64 ft/sec. The ball is 4 ft above the ground when it is released. Its height, in feet, at time t seconds is given by: h (t) = - 16t^2 + 64t + 4.

Total these measurements. Your answer should indicate the proper accuracy. Be sure to include the units in your answer.

What is vector quantities?