Phy 101 Chapter X C In A Car Lift U X CA Hydraulic Lift H x C We show How To x C
ID: 1641236 • Letter: P
Question
Phy 101 Chapter X C In A Car Lift U X CA Hydraulic Lift H x C We show How To x C A 3.00-liter Alum x C Estimate The Fra x CA 55.0-kg Womar x LO X C O www.webassign.net Responses/last?dep 15943650 /web/Student/Assignment (b) What is the average kinetic energy per molecule? 6.02 10 -21 J (c) How much energy would have to be added to the system to double the rms speed? The molar mass of helium is 4.000 x 10 kg/mol. EXERCISE HINTS GETTING STARTED I M STUCK The temperature of 6.00 moles of argon gas is lowered from 2.50 x 102 K to 2.10 x 102 K. (a) Find the change in the internal energy, AU, of the gas. 3741 How do you compute the change in something? Write an expression for the internal energy as a function of system parameters, such as the number of moles of gas, then find its change. J (b) Find the change in the average kinetic energy per atom. 1.03 10 -21 You are using a valid expression, but since your answer to part (a s wrong, this answer is wrong too. J Need Help? Read It Submit Answer Save Progress 4. 111 points I Previous Answers SerCP8 10.P013.ssm My Notes A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion 1.30 x 10 4oc-1). At room temperature (20.0°c), the frames have circular lens holes 2.05 cm in radius. To what temperature must the frames be heated if lenses 2.06 cm in radius are to be inserted into them? 57.5 Need Help? Read It Talk to a Tutor M O A 11:25Explanation / Answer
Given,
no. of moles, n = 6
a) T = 210 K - 250 K = -40 K
U = f/2 x n R T (where f is the value of degree of freedoms)
Since, argon is monoatomic gas, therefore, f = 3
U = (3/2) x 6 x 8.314 x 40 = - 2993.04 J or - 2.99 KJ
b) Change in internal energy, | = Change in average kinetic energy
Therefore, KE = 2993.04 J
KE per atom = KE / (n x Na ) (where Na = Avogadro number)
Therefore, KE per atom = 2993.04 /(6 x 6.022 x 1023 )
KE per atom = 8.28 x 10-22 J