this questions Atmospheric pressure is about 1 times 105 Pa. How large a force d
ID: 2116836 • Letter: T
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Atmospheric pressure is about 1 times 105 Pa. How large a force does the air in a room exert on the inside of a window pane that is 40 cm times 80 cm? 1.0 times 104 N 3.2 times 104 N 4.8 times 103 N 9.6 times 103 N 1.8 times 103 N It is measured that 250 cm3 of fluid flows out of a tube whose inner diameter is 7 mm in a time of 41 s. What is the average velocity of the fluid in the tube? 15.8 m/s 1.38 m/s 3.60 m/s 0.158 m/s 0.36 m/s The density of gold is 19.30 g/cm3 at 20 degree C, and the coefficient of linear expansion is 14.3 times 10-8 C-1. What is the density of gold at 90 degree C? 18.24 g/cm3 19.36 g/cm3 20.19 g/cm3 19.24 g/cm3 18.36 g/cm3 How much heat is required to heat 250 cm3 of water from 20 degree C to 35 degree C? [For water, c = 1 cal/g degree C] 3750 cal 5730 cal 37.50 cal 57.30 cal 7500 cal Find the rms speed of a Nitrogen molecule (M = 28 kg/kmol) in air at 0 degree C [NA = 6.02 times 1026 kmol-1 and k = 1.38 times 10-23 J/K] 490 m/s 350 m/s 140 m/s 670 m/s 930 m/sExplanation / Answer
the formula is density at T= initial density/(1+a*(change in T) ) where a= linear coefficient of expansion.=14.3 * 10^-4 please check this value(not visible properly) initial density=19.3 change in T=90-20=7 density at T= 19.3/(1+14.3*10^-4*70)=17.54
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