5questions ! 1. what is newton's first law known as? the law of a- friction b- mass c- gravity d- inertia 2. many people are familiar with the fact that a rifle recoils when fired. this recoil is the result of action-reaction force pairs. a gunpowder explosion creates hot gases that expand outward allowing the rifle to push forward on the bullet. consistent with newton's third law of motion, the butlet pushes backwards upon the rifle. the acceteration of the recoiling rifle a- greater than the acceleration of the bullet. b- smaller than the acceleration of the bullet. c- two times greater than the acceleration of the bullet. d- the same size as the acceleration of the bullet. 3. the fact that a large cruise ship can float in water is an example of what ? a- weight b- buoyant force c- volume d- friction 4. devices such as seat belts and air bags are used to protect passengers from which one of newton's laws ? a- law of action/reaction b- none of these c-law of inertia d-law of acceleration 5. which of the following affect friction ? (you can choose one or more than 1) * hight * weight * length * roughness of surface

1. Inertia is newtons first law

2. D the same size as the acceleration of the bullet ( for It is the same explosive force)

3. B. buoyant force Buoyancy is essentially how well it floats in water

4. C. law of inertia ( when stop your car and you don't have a belt, you continue moving that same mph the car was moving before you stopped.)

5.D roughness of surface (actually all affect friction but the surface would be the greatest factor at play)

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what are the choices?

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."