3) The atomic number of magnesium is 12. This means that its nucleus must contain

A) 6 protons and 6 neutrons.

B) 6 neutrons and 6 electrons.

/C) 12 neutrons and no protons.

D) 12 protons and no electrons.

A car travels 90 meters north in 15 seconds. Then the car turns around and travels 40 meters due south in 5 seconds. What is the magnitude of the average velocity of the car during this 20 second interval?

Marissa drags a 23 kg duffel bag 18 m across the gym floor. if the coefficient of kinetic friction between the floor and bag is 0.15, how much thermal energy does marissa create?

Which are not in the nucleus? Check all that apply A. Ions B. Electrons C. Protons D. Neutrons

Define suspension and list two examples.

What type of circuit continues to supply electricity to light bulbs and why doesn't it burned out

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines

Which of the following statements concerning Howard Gardner's multiple intelligences is not correct? A. Gardner is not interested in assessing levels of intelligence. B. Gardner has based his theory on research in various areas of psychology. C.

The force of attraction between two oppositely charged pith balls is 5.3 * 10-6 newtons. If the charge on the two objects is 6.7 * 10-9 coulombs, what is the distance between the two charges? (k = 9.0 * 109 newton·meter2/coulombs2)