You are designing a four-stroke cycle diesel engine to provide a brake power of 300 kw naturally aspirated at its maximum rated speed. based on typical values for brake mean effective pressure and maximum mean piston speed, estimate the required engine displacement, and the bore and stroke for sensible cylinder geometry and number of engine cylinders. what is the maximum rated engine speed (rev/min) for your design? what would be the brake torque (n-m) and the fuel flow rate (g/h) at this maximum speed? assume a maximum mean piston speed of 12 m/s is typical of good engine designs

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.