Answer Happy

6) Brass and steel sheets, each thickness lem, are placed in contact as shown in the figure. The outer surface of the brass is kept at 1020 °C, while the outer surface of the steel is kept at 21C. What is the temperature (in C) at the junction (contacted interface)? The thermal conductivities of brass 210 and steel are in a ratio of 2: 1. 1020 A) 34 B) 47 C) 60 D) 674 E) 687 7) If the sun's surface area is 2x10' mand the sun radiates energy at a rate of 4.8x1026 W. Estimate the temperature (in K) of the sun's surface? Assume the emissivity of the sun's surface is 1 i.e.c=1; 0 - 5.67x10). A) 8066 B) 6783 C)6129 D) 5704 E) 5394 8) Find the root-mean-square speed Vrms in m/s) of a monoatomic gas at 300 C temperature? (Given the molar mass of the gas is 28 g mole) B) 649 C) 714 D) 774 A) 576 E) 830 Pcm Follow the following 4 Questions) Fill in the blanks sample of a monatomic ideal gas occupies 5.00 L af atmospheric pressure and temperature of 100 K, starting at point A, as shown in the figure. It is warmed at constant volume o 300 tun (point B). Then it is allowed to expand othermally to 1.00 atm (point C) and then compressed sobarically to its original state, A. 9 The member of moles in the sample is 10 The volume in L) of the gas at point is 11) The work by the system done per cycle in Jis 12) The Change internal energy per cycle in Jis

1) A 254 g of nitrogen gas in a 45 L tank at a temperature of 200 C and pressure (P) Find the nitrogen gas pressure (in atm); where the molar mass of the nitrogen gas is 28 g/mol? A) 7.9 B) 11.2 C) 14.5 D) 17.8 E) 21.1 2) An auditorium has a volume of 6 x 10m'. How many air molecules are needed to fill the auditorium at a pressure of 10x10 Nm and a temperature of 27 °C? A) 2.9 x 10 B) 5.8 10 C) 8.7 x 10 D) 11.6 % 10 E) 14.5 x 10 29 3) Consider a metal slab of 74 g. its temperature rises by 30 °C when 1.32 # of heat energy is transferred to the slab. Determine the metal material's specific heat capacity (in J/kg. C? A) 1783.8 B) 594.6 C) 356.8 D) 254,8 E) 198.2 4) Heat is transferred to 3 moles of an ideal gas enclosed in a cylinder with a piston. How much work (in kJ) is done on the gas when its pressure increases from 4.9 atm to 62.6 atm at a constant temperature of 257 "C? A) 11.2 B) 22.5 C) 33.7 D) 449 E) 56.1 5) The internal energy of n moles of an ideal gas depends on A) one variable T. B) two variables, T and V. C) two variables, T und P. D) three variables, T. P. and V. E) four variables R. T. P. and V.