Physics, 07.10.2019 16:20 MoneyMike42
An instrument used to measure the airspeed on many early low-speed airplanes, principally during 1919 to 1930, was the venturi tube. this simple device is a convergent–divergent duct. (the front section’s cross-sectional area a decreases in the fl ow direction, and the back section’s cross-sectional area increases in the fl ow direction. somewhere between the inlet and exit of the duct, there is a minimum area called the throat .) see fi gure below. let a 1 and a 2 denote the inlet and throat areas, respectively. let p 1 and p 2 be the pressures at the inlet and throat, respectively. the venturi tube is mounted at a specifi c location on the airplane (generally on the wing or near the front of the fuselage) where the inlet velocity v 1 is essentially the same as the free-stream velocity—that is, the velocity of the airplane through the air. with a knowledge of the area ratio a 2 / a 1 (a fi xed design feature) and a measurement of the pressure difference p 1 − p 2 , we can determine the airplane’s velocity. for example, assume aa 21 a 1 4/ a a a = and p 1 − p 2 = 80 lb/ft 2 . if the airplane is fl ying at standard sea level, what is its velocity?
Answers: 2
Physics, 22.06.2019 12:30, promcafee8788
Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j
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Physics, 22.06.2019 23:30, gymnastlyfe123
The power exerted by a muscle is the product of the force exerted and the velocity of contraction. the area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?
Answers: 2
Physics, 23.06.2019 00:40, bravomichelle75
Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*
Answers: 1
An instrument used to measure the airspeed on many early low-speed airplanes, principally during 191...
Mathematics, 14.10.2019 09:20
Mathematics, 14.10.2019 09:20
Mathematics, 14.10.2019 09:20