Air enters a 11-m-long section of a rectangular duct of cross section 15 cm × 20 cm made of commercial steel at 1 atm and 35°c at an average velocity of 5 m/s. disregarding the entrance effects, determine the fan power needed to overcome the pressure losses in this section of the duct. the properties of air at 1 atm and 35°c are rho = 1.145 kg/m3, μ = 1.895 × 10–5 kg/m·s, and ν = 1.655 × 10–5 m2/s. the roughness of commercial steel surfaces is ε = 0.45 m. the fan power needed to overcome the pressure losses is

Sarah and michelle work at a tech company that designs exercise apps. sarah tells michelle she has heard that james, their supervisor, interviewed with a competitor and may be leaving the company, which would open up a management position. what kind of power is sarah exerting?

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Which of the following is an example of motion in two dimensions?