{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Physics 7A W06 Final Review

# Physics 7A W06 Final Review - Physics 7A Winter 2006 Final...

This preview shows pages 1–2. Sign up to view the full content.

Physics 7A Winter 2006 Final Review 3/17/06 1 7A Final Review Questions 1) Olaf the Snowboarder (70 kg, including his snowboard) is on the top of an inclined slope at an initial height of 50 m . Olaf snowboards down the slope; then Olaf moves 10 m over bumpy ice that imparts a frictional force of 600 N against his direction of motion; then Olaf finally compresses a k = 8000 N/m spring by a maximum displacement ° x. The only friction he encounters is over the bumpy ice. The drawing below is not to scale. Hint: Olaf does work going through bumpy snow. 50m Ol af bumpy snow 10m ² x uncompressed spring (a) Draw a properly labeled energy interaction diagram for Olaf during this entire process. (b) Find the maximum displacement ° x of the spring for the case of Olaf having no initial velocity. [x = 2.66 m] 2) The molar heat capacity of a certain ideal gas is measured (for a constant volume process) to be 3 R = 24.94 J/mol·K at a temperature of 27° C. (a) Find the thermal energy of 3.5 moles of this gas. [Eth = 26,187 J] (b) The gas is cooled from its initial temperature to –17° C. During this process 965 J of energy is transferred out of the gas system as heat. Calculate the work done. Specify whether the work is done on or by the system. [W = –2,876 J]

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}