The element boron (B, atomic number 5 and atomic mass 11) is right above aluminum (Al, atomic number 13 and atomic mass 27) in the periodic table. How many more electrons does aluminum have than boron? Why?

What is the difference in the motion between a positive and a negative initial velocity?

something that is figurative place where a person locates the source of responsibility in his or her life.

What does that mean about the densities of the phases of water

Which of these is a source for particulate matter in the air? a. automobiles b. dust c. fires d. all of the above

Um pequeno avião decola de um aeroporto em um dia nublado e é avistado mais tarde a 215 km de distância, em um curso que faz um ângulo de 22° a leste do norte.

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.