The David Let terman Show on CBS often features a segment
called ‘Will it Float’. Simply, Dave and Paul try to determine
if an object, such as a refrigerator or 100 ft of insulation
cable, will float when dropped into a large container of water.
Question: What physical property of a material will
determine ‘if it will
float’? What would be a more scientifically accurate (if less catchy) name
for the ‘Will it float’ segment on Dave’s show?
Discussion: “Battleships and dating
Task: Using the table supplied above, sketch a picture of
what would happen
if ~30 mL samples of ethanol, mercury and water, as well a silver dollar and
a gold ring were added to a volumetric cylinder.
If a 200 mg piece of gold is hammered into a sheet measuring 2.4 ft by 1.0
ft, then what is the sheet’s thickness in meters? If a gold atom is 0.26 nm
wide, how many atoms thick is the sheet?
“The Wire” & “Sketch”
The following questions were taken from your 1st practice
A copper (Cu) wire has a mass of 4.00 pounds and a
diameter of 5.00 mm. Determine
the wire’s mass and in the units specified below. Include any appropriate
decimal prefixes in your final answers. Density °F copper = 8.95 g/cm3
Mass of the wire in kg:
ANS: 1.81 kg (3 sf)
Volume of the wire in cm3:
ANS: 202 mL (3 sf)
Sketch a fully labeled diagram illustrating the appearance of a 100 mL cylinder
following items have been added to it: