6.a train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a velocity of 42m/s what is the approximate acceleration of the train during this time?
0.17 m/s2
0.20 m/s2
0.16 m/s2
0.14 m/s2
0.19 m/s2

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

State the following: boyle's law and charle's law