Which of the following statements are part of John Dalton's atomic theory?
I. All atoms of an element are identical in all ways.
II. Isotopes have the same number of neutrons but a different number of protons.
III. Compounds are always composed of two or more elements.
IV. Atoms of different elements are different. V.Compounds are random chemical combinations of several elements

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

Which of the following situations would produce an average velocity of zero? o a. a horse galloping in a field b. a round-trip to school and back o c. a trip, first to the moon, then onto mars o d. the criss-crossing path of a flying bug