Fluid flows over a smooth cylinder. the diameter of the cylinder is d and the length normal to the flow direction is l. the drag coefficient is defined as:
cd⁢ = fdrag / 1/2⁢ rho⁢ u^2⁢ d⁢ l
the drag coefficient is essentially constant with a value of 1.1 in the range of reynolds numbers of 10^3 to 10^5. in this range, at a velocity of 2 m/s the drag force is 3 n. when the velocity is doubled to 4 m/s the drag force is

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.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.