A molecule of DNA (deoxyribonucleic acid) lies along a straight line. It is 2.778 µm long. The ends of the molecule become singly ionized; negative on one end, positive on the other. The helical molecule acts as a spring and compresses 1% upon becoming charged. Determine the effective spring constant of the molecule. Take into account the compressed length when calculating the distance between the ends of the molecule. The Coulomb constant is 8.99 × 109 N · m2 /C 2 . Answer in units of N/m.

Acurve connects the data points that are plotted. (physical science chapter 11 motion)

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3