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

Question

Which of the following DIRECTLY affects the RMS speed of molecules in a container. number of moles Pressure Volume molecular binding energy temperature How high of a mountain should you climb to work off 4.2 kcal of food if you weight 100 kg? 4.0 m 4.2 m 4.3 m 9.8 m 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? 200 J -200 J 3800 J 0J 1900 J How much work is done by the isovolumetric process shown below PV (P_BminusP_A) V (P_AminusP_B) V 0 None of the Above

Explanation / Answer

32. Answer is volume

Effect of a volume increase at constant temperature: The fact that temperature remains constant means that the average kinetic energy of the gas molecules remains unchanged. This in turn means that the rms speed of the molecules, u, is unchanged. However, if the volume is increased, the molecules must move a longer distance between collisions. Consequently, there are fewer collisions per unit time with the container walls and pressure decreases. Thus, the model accounts in a simple way for Boyle's law.

33. Answer is B = 4.2 m

4.2 *1000/1000

34. Change of internal energy equals heat transferred to plus work done on the gas, i.e.:
U = Q + W
= 2000J - 1800J
= 200J

35.Answer is B

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