At an elevation of 5 ,000 m, a ir and fuel flow into a jet engine on a plane and leave as hot exhaust . t he plane ’ s speed is 8 00 km/hr , relative to the ground . at the engine a ir intake, a = 2 .00 m 2 . the fuel use i s 9,500 kg/hr. at the exhaust, a = 0.8 m 2 and v = 1,100 km/hr relative to the ground . what is the density of the exhaust? assume the intake and exhaust pressures are at the u. s. standard atmosphere conditions (table c.2) . (note the exhaust is a mixture of air, co2 and water vapor.)

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system