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- When lead is melted at atmospheric pressure, the melting point is 327.0 °C, the density decreases from 1.101 × 104 to 1.065 × 104 kg/m³, and the latent heat is 24.5 kJ/kg. Estimate the melting point of lead, T, at 41 atm. P - Select one: a. 327.164 °C b. 326.836°C O c. 327.096 °C O d. 326.409 °C1. A walrus transfers energy by conduction through its blubber at the rate of 165 W when immersed in -1 deg C water. The walrus's internal core temperature is 36.5 deg C, and it has a surface area of 2 m². What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood (k=0.2 J/(s m °C))? d= cm8. IP A constant-volume gas thermometer has a pressure of 80.3 kPa at -10.0 °C and a pressure of 86.4 kPa at 10.0 °C. (a) At what temperature does the pressure of this system extrapolate to zero? (b) What are the pressures of the gas at the freezing and boiling points of water? (c) In general terms, how would your answers to parts (a) and (b) change if a different constant- volume gas thermometer is used? Explain.
- Q3/ Determine the parameters of a module formed by 44 solar cells in series, under the operating conditions G=1000 W/m?, and Ta=34°C. Manufacturers values under standard conditions are: Isc=3A, Voc=20.4V, Pmax=65.9 W, NOCT=43°C.A steam pipe is covered with 1.50-cm-thick insulating material of thermal conductivity 0.200 cal/cm . °C . s. How much energy is lost every second when the steam is at 200.°C and the surrounding air is at 20.0°C? The pipe has a circumference of 800. cm and a length of 50.0 m. Neglect losses through the ends of the pipe.C=3.0*10°ms", m,=1.673*10"Kg, mn=1.675*102"Kg, Re=1.097*10'm, K=9*10°Nm°c?, F=9.6485309*10°Cmol', mol", la.m.u.=1.660569*10²" kg. ao=5.29*10'"m e=1.6*101°c, Eo=8.8*10-12Asvm², m,=9.1*103"Kg, h=6.62*10*Js, h/2T=1.05*10Js, NA=6.022045*10²3 -27 1-Find the atomic mass of the following elements CI, O and Pb; if M(CI)=35.45g, M(0)=16.00g and M(Pb)=207.20g? М(celement) m, atom N. 2-Find the radius of the nuclei of the following elements 1"1, 13Cs and 238U? "'muet = (1.3)A/3 *10-1$ m
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