Let r4 have coordinates (xz1, 22, ^3, ra), and consider the vector fields 2 t1 and x4 (a) find all nonzero lie bracket relations and use them to stratify r1. (b) compute the exponential map and group law. (c) find the matrix corresponding to the inner product that makes these vectors orthonormal

The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

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.