Consider a cyclist coasting down a hill where the road grade is 7%. The total weight of rider and bike is 140 lbf. The rolling resistance coefficient is 0.009 (see H6.4). Using data in text Figure 9.32, determine: a. terminal speed [ft/s, mph] with rider in upright position b. terminal speed [ft/s, mph] with rider in racing position

In the given image, both fluids are at 20°C. The specific weight of water is 9790 N/m³. If surface tension effects are negligible and a = 8.35 cm, what is the density of the oil, in kg/m³? Oil 6 cm Water Numeric Response CO 10 cm

2. A student team is to design a human-powered submarine for a design competition. The overall length of the prototype submarine is 4.85 m, and its student designers hope that it can travel fully submerged through water at 0.440 m/s. The water is freshwater (a lake) at T = 15 °C. The design team builds a one-fifth scale model to test in their university's wind tunnel, as shown in the Fig. A shield surrounds the drag balance strut so that the aerodynamic drag of the strut itself does not influence the measured drag. The air in the wind tunnel is at 25 °C and at one standard atmosphere pressure. At what air speed do they need to run the wind tunnel in order to achieve similarity? Take for water at T = 15 °C and atmospheric pressure, p = 999.1 kg/m³ and µ = 1.138 × 10-³ Pa.s. Take for air at T = 25 °C and atmospheric pressure, p = 1.184 kg/m³ and µ = 1.849 × 105 Pa.s. Wind tunnel test section V Poo, P Model Shield FD Drag balance Strut

Pitch direction A baseball pitcher throws a curveball by spinning and throwing the ball, and the schematic diagram shows the stylized pattem of air flow around the ball on a horizontal plane. As the ball travels in the air, it also spins, causing the air flow velocity on the right of the ball, Vz, to be lower than the air flow velocity on the left, VL. The air has density, p. Air flow around the ball p-12 kg/m VR 15 m/s V 18 m/s g-9.81 m/s Spin direction (a) Which way will the baseball curve? To the left, or to the right? (b) Use Bernoulli's cquation to estimate the magnitude of pressure difference between the left and right sides of the ball, that causes the ball to curve. VL VR

A model airplane flies over an observer O with constant speed in a straight line as shown. Determine the signs (positive [p], negative [n], or zero [z]) for r, r, r, 0, 0 and 0 for each of the positions A, B, and C. Position r A B 0 Answers: Choose "p" or "n" or "z" с y 1 B V 200 ILL 200 0 207 0 :0