The growth of ride-sharing services such as Uber and Lyft has generated much discussion in the news. Drivers operate as independent businesses, working as many hours as they choose and earning a portion of the fares set by the company. However, during periods of high demand, the market price increases (such as "surge" pricing by Uber). Note, that a competitive firm cannot change the price based on demand. However, Uber claims it is a competitive firm. Provide a few reasons why ride-sharing companies share the characteristics of a perfectly competitive industry.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit. explain why the pneumatic piston stumbles when it hits an obstacle.