What is one limitation of a wind tunnel that is used to model the effect wind has on a rocket? OA. The airflow in the tunnel can be varied based on the altitude of the rocket. OB. The ceramic tiles that coat a rocket can be tested. OC. It shows how the rocket performs in the atmosphere, but not in space. D. It provides valuable information about wind's effect on how rockets fly.

What is one limitation of a wind tunnel that is used to model the effect wind has on a rocket? OA. The airflow in the tunnel can be varied based on the altitude of the rocket. OB. The ceramic tiles that coat a rocket can be tested. OC. It shows how the rocket performs in the atmosphere, but not in space. D. It provides valuable information about wind's effect on how rockets fly.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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#69, bottom question...please help!
1. A propeller 1 f t in diameter rotates at 1200 rpm in water and absorbs 2 hp. Find the power coefficient, and estimate the power required to increase the speed to 1500 rpm if the power coefficient remains constant. 2. A high-speed two-bladed wind turbine 35 m in diameter operates at its peak effi- ciency in winds of 30 km/hr. Estimate the power generated, the rotor speed, and the wind velocity in the wake.
6
An airplane is pressurized with air to 650 mmHg. a. If air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100 mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?
A frequently quoted rule of thumb in aircraft design is that wings should produce about 1000 N of lift per square meter of wing. (The fact that a wing has a top and bottom surface does not double its area.) a. At takeoff, an aircraft travels at 55 m/s, so that the air speed relative to the bottom of the wing is 55 m/s. Given the sea level density of air to be 1.29 kg/m3, how fast must it move over the upper surface to create the ideal lift? b. How fast must air move over the upper surface at a cruising speed of 249 m/s and at an altitude where air density is one-fourth that at sea level?
Water can form large dewdrops in nature. How droplets made of vegetable oil instead of water be different? A. Oil can form the same large droplets as water because it has strong intermolecular forces. B. Oil would form droplets, but only very tiny ones because its surface tension is lower than that of water. C. Oil forms slicks, not droplets, because of its molecular structure. D. All liquids will form the same large droplets that water does.
Problem6 When a viscous fluid flows parallel to a horizontal plate, it leads to the development of a thin boundary layer on the plate surface. The velocity within the boundary layer varies with the vertical direction as u(y) = US where 8(x) = 3.5 VX/Uis the boundary layer thickness vx 8(x) that increases with the horizontal position. Outside of the boundary layer, the flow is uniform and equal to the free stream velocity U... Show that for two fluids of different viscosities (₁, ₂) and densities (P₁, P2) and flowing at the same free stream velocity, the ratio of the drag force they generate on the plate is proportional to the square root of the ratio of the viscosities and densities: FD2 FD1 = H₂P2 M₁P₁
Which statement is incorrect about gases, liquids, and solids? O Gases and liquids flow so they are both fluids. O Liquids and solids are hard to compress. O All these statements are incorrect. O Solids and gases take the shape of containers they arc in.
9. Mr. Comer fiddles around with the air reservoir on the stomp rockets, and increases the pressure. He manages to get his rocket up to an impressive height of 58 meters. How fast was the rocket going the moment he stepped on it?
H6.
3. Examine the diagram of the balloon-powered boat. Party balioon (Blown up) Bendy type drinking stran Styrofoam boat a. Draw arrows to show the direction of the escaping air and the direction the boat will move. b. What would happen if the free end of the straw was pointing toward the front end of the boat? Worksheet #6A.20c