Question

An Engineering student has decided to carry an advertisement sign on top of her car for additional income. Consider a sign that consists of a 0.4 m high, 0.95 m wide, and 0.95 m long rectangular block mounted on top of her car such that the sign has a frontal area of 0.4 m by 0.95 m from all four sides. Assume the car is driven 55000 km a year at an average speed of 60 km/h and the overall efficiency of the engine is 27%. (You can assume the drag coefficient CD of the block to be 2.2 and the density of air to be 1.25 kg/m3).

Determine the increase in the annual work that the car needs to perform due to this sign. Provide your answer to 2 decimal places.

Answer 1