Un fir, de sectiune s = 5 mm patrati si lungime l0= 32 cm, este intins de o forta. stiind ca e = 3 * 10 la put 7 n/m patrat, sa se calculeze constanta elastica k a firului.

Nitrogen (n2) undergoes an internally reversible process from 6 bar, 247°c during which pν1.2 = constant. the initial volume is 0.1 m3 and the work for the process is 121.14 kj. assuming ideal gas behavior, and neglecting kinetic and potential energy effects, determine heat transfer, in kj, and the entropy change, in kj/s. show the process on a t-s diagram.

The ability to make things happen is also called a. heat b. force c. matter d. energy

Suppose astronomers built a 140-meter telescope. how much greater would its light-collecting area be than that of the 10-meter keck telescope? express your answer using two sign