Q3: Amplitude and period in SHM A block attached to a spring oscillates in simple harmonic motion along the 3 axis. The limits of its motion are x = 10 cm and r = 50 cm and it goes from one of these extremes to the other in 0.25 s. Its amplitude and frequency are: A. 40 cm, 2 HZ B 20 cm, 4 HZ C. 40 cm, 2 Hz D. 25 cm. 4 Hz E 20 cm, 2 Hz ОА B Ос D E

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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.

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above