ps13b34 - Ph 111.01 December 3, 2008 PS 13b (34) Problem 1...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Ph 111.01 December 3, 2008 PS 13b (34) Problem 1 = Walker P. 15-55. (a) Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 116 m/s, and along the bottom surface with a speed of 100 m/s. kPa (b) If the area of the wing is 31 m 2 , what is the net upward force exerted on the wing? kN 1 2 Solution. (a) We use Bernoulli’s law to compare points 1 and 2, assuming that their heights in the gravitational field are about equal, so that the term can be neglected. gy ρ 22 11 2 2 Pv += + giving () 21 1 2 3 1 2 1.29 kg/m 116 m/s 100 m/s 2229 Pa PP v v ρρ −= =− = =2.23 kPa (b) Just multiply by the area. ( )( ) 2 F=PA= 2.23 kPa 31 m 69.1 kN = Problem 2 = Walker P. 16-5. The temperature at a particular spot on the surface of the Sun is 5700 K. (a) Convert this temperature to the Celsius scale. °C (b) Convert this temperature to the Fahrenheit scale. °F Solution. A person should be able to work this out, from three facts: (1) absolute zero is at - 273 ° C; (2) the range of temperature from freezing to boiling is 180 ° in Fahrenheit, and 100 °
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/13/2010 for the course PHYSICS 111 taught by Professor Staff during the Fall '08 term at S.F. State.

Page1 / 3

ps13b34 - Ph 111.01 December 3, 2008 PS 13b (34) Problem 1...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online