Acertain perfect gas is compressed reversibly from 1 bar, 17 °c to a pressure of 5 bar in a perfectly thermally insulated cylinder, the final temperature being 77 °c. the work done on the gas during the compression is 45 kj/kg. calculate γ, cv, r, and the molar mass of the gas.

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

If element x has 99 protons how many electrons does it have

Two charged particles, q1 and q2, are located on the x-axis, with q1 at the origin and q2 initially at x1 = 12.2 mm. in this configuration, q1 exerts a repulsive force of 2.62 µn on q2. particle q2 is then moved to x2 = 18.0 mm. what is the force (magnitude and direction) that q2 exerts on q1 at this new location? (give the magnitude in µn.)