1. Suppose you are flying a 7,784 kilograms aircraft at 14,630 meters where the air density is 0.2062 kilograms/cubic meter. Your current cruising speed is 290 kilometers/hour (108 m/s) and the wing area of the aircraft is 186 square meters. You need to make some altitude changes and will need to know the "Lift Coefficient" of the aircraft in order to do so. What is theCl for your aircraft?

When a 2.30-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.13 cm. (a) What is the force constant of the spring? N/m(b) If the 2.30-kg object is removed, how far will the spring stretch if a 1.15-kg block is hung on it? cm(c) How much work must an external agent do to stretch the same spring 8.60 cm from its unstretched position? J

Panels AB and CD in Fig.  are each 120 cm wide intothe paper. ( a ) Can you deduce, by inspection, which panelhas the larger water force? ( b ) Even if your deduction isbrilliant, calculate the panel forces anyway.