Wednesday, October 31, 2001

• I will be out of town at a conference Thursday, Nov. 1 through Tuesday, Nov. 6
• Class will still be held Friday and Monday.
• I should have email access, but I cannot guarantee this.
• Web Project links should be sent to me within the next week.
• The answers to Exam 2 can now be accessed from the UNC Electronic Reserves
• My solution to the Automobile Flywheel problem is also available.

Ponderables:

• What determines whether an object floats?
• How much water is displaced by a floating object?
• How much water is displaced by a submerged (sunken) object?
• Does an object weigh more or less in a vacuum?
• How much would you appear to weigh in a vacuum?
• What happens to the water level in a glass as the ice in it melts?
• A person in a boat floating in a small pond throws an anchor overboard.  Does the level of the pond rise, fall, or remain the same?
• Why does a can of Coke sink, but Diet Coke floats?
• How can you make a bowling ball float?
• How does the Bernoullie blower work?

• How much would a 70.0-kg person "weigh" in a vacuum? [685.1 N]
• What is the maximum weight that the suction square could support (Dia. = 6 in.)?  [400 lbs.]
• You decide to weigh your car by applying the physics you have learned.  Each tire is inflated to 35 psi and the area in contact with the road is about 20 sq. in.  How much does the car weigh?  [2800 lbs.]
• Problem #22 from Ch. 9:  What fraction of the total volume of an iceberg is exposed above water?  [10.7%]
• Which is more effective for improving the flow rate of blood through an artery:  1)  use of a blood thinner that reduces the blood's viscosity by 50%, or 2) an angioplasty procedure that increases the inside diameter of a clogged artery to twice its original size?  [The flow rate will be 8 times greater for the angioplasty than for the blood thinner.]

• HW9b (due Friday, Nov. 2)
• HW10a (due Friday, Nov. 2)
• HW10b (due Wednesday, Nov. 7)
• RWP10 (due Wednesday, Nov. 7)
• Send me an email with the URL for your Web Project.