The volume of 1 kg of helium in a piston–cylinder device is initially 5 m3. now helium is compressed to 2 m3 while its pressure is maintained constant at 130 kpa. determine the initial and final temperatures of helium as well as the work required to compress it, in kj. the gas constant of helium is r = 2.0769 kj/kg·k.

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

Determine the maximum r-value of the polar equation r =3+3 cos 0

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j