Which of the following DIRECTLY affects the RMS speed of molccules in a containe

Question

Which of the following DIRECTLY affects the RMS speed of molccules in a container. A) number of moles B) Pressure C) Volume D) molecular binding energy E) temperature How high of a mountain should you climb to work off 4.2 kcal of food if you weight 100 kg? A) 4.0 m B) 4.2 m C) 4.3 m D) 9.8 m E) 18 m 2000 J of heat is added to a system, and 1800 J of work is done on the system. What is the change in internal energy of the system? A) 200 J B) -200 J C) 3800 J D) 0 J E) 1900 J How much work is done by the isovolumetric process shown below Isovolumetric A) PV B) (P_B-P_A) V C) (P_A-P_B) V D) 0 D) None of the Above

Explanation / Answer

32)

rms speed vrms = sqrt(3RT/M)

option(E)

33)

E = m*g*h

1 cal = 4.2 J

4.2*10^3*4.2 = 100*9.8*h

h = 18 m

option (E)

+++++++++++++++++++++

34)

from Ist law of thermodynamics

Q = U + W

2000 = U - 1800

U = 3800 J

option (C)

++++++++++++++

35)

w = p*dV

since volume is constant dv = 0

W = 0

option (D)

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