Aflat-plate x-ray diffraction pattern was cuka radiation. it consisted of a series of spots arranged along a horizontal line containing the central spot and first-order layer lines above and below the central line. it was found that with a specimen-to-film distance of 30 mm the first order lines were 22.9 mm above and below the central spot. (a) calculate the spacing of the chain repeat c of the polymer crystals. (b) explain why only first-order layer lines are observed for this polymer and suggest how higher order lines may be obtained. (c) determine the angle through which the specimen would have to be tilted in order to obtain the (001) reflection on the diffraction pattern.

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

More solar radiation is absorbed by earth’s surface than by