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Movement of stagnant air over a surface typically decreases the pressure that air exerts on the surface it was in contact with, and higher air velocities usually result in more important pressure drops. This pressure drop from rapidly moving air across a surface is generally how a tornado removes the roof from a building. Imagine that I made a miniature model of a town to devastate with a simulated tornado. If each building has a soft wood roof (r = 513 kg/m3) that just sits on top of the building with uniform dimensions (25 mm x 35 mm x 4 mm) with an internal pressure of 101 kPa, what is the maximum pressure (in Pa) over the roof that I require to achieve to simulate the effect of a tornado-induced removal assuming that the roof is not glued down to the walls that support it (that is, only its weight and the air pressure outside the roof hold it down)?
The propulsion system on a 1500kg rocket car fires for 15 seconds and the propulsion force is equal to F= x(80-x). What is the average speed for the entire two stage event
When a 19.7 kg wheel with an angular speed of 2.30 rad/s is disconnected from a motor, a 0.219 N · m frictional torque slows the wheel to a stop. how long will it take for the wheel to come to rest
A long string with a mass/length of 500 g/m is placed under a tension of 400 N, What is the wavelength of the resulting wave
a mechanism on earth used to shoot down geosyn- chronous satellites that house laser-based weapons is finally perfected
The dialectric breakdown of air is approximately 3E6 V/m. This is the electric filed required to create a spark, What is the approximate voltage on the sphere at that instant
A 17cm radius air duct is used to replenish the air of a room 7.1 m x 5.2 m x 4.5 m every 16 min. How fast does air flow in the duct
the total charge a household battery can supply is given in units of mahr. for example a 11v alkaline battery is rated
at our latitude the earths field has both a horizontal and a vertical component. which one are you sampling when you
Two circular glass microscope slides of diameter 1 cm are separated by a water film of thickness t = 10 mu m. The water completely wets the slides. What is the contact angle of water on the slides?
A child slides down a snow covered slope that makes an angle of 20 degrees with the horizontal. At what angle would the child slide with constant speed
The time-varying current in an LC circuit where C = 11.9 µF is given by i(t) = (1.25 A) sin (1310t), where t is in seconds. What is the total energy of the circuit?
A hand bicycle pump should compress air from atmospheric pressure to the pressure inside the tire (usually 5 or 6 atmospheres). Please estimate the temperature of the air as it enters the tire.
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