Physics 2 Tutorial 1
9/28/2011
Fall 2011
1.
Iron has a property such that a 1.00 m^3 volume has a mass of 7.86x10^3 kg (i.e.
its density is 7.86x10^3 kg/m^3). You want to manufacture iron cubes. Find the
length of the side of a cube of iron that has a mass of 350.0 g. Give your answer in
units of cm using scientific notation to the correct number of sig figs.
Solution:
Density P = Mass/Volume=M/V.
For a cube, V = L^3. We are interested in finding L and know M and P for our cubes.
Substituting L^3 for V, one obtains P = M/L^3, which implies L = (M/P)^(1/3). One
needs to convert grams to kilograms, such that 350.0g(kg/1000g) = 0.3500 kg. Thus
L = (0.3500 kg/ 7.86x10^3 kg/m^3)^(1/3) = 0.0354 m. This needs to be in cm, so
multiply 0.0354m by (100cm/m) to obtain 3.54 cm or, in scientific notation with
correct sig figs, 3.54x10^0 cm.
2.
Bike or Drive to Campus.
Jon lives 6 miles from campus (the ARC) in Santa Ana. Due to a poor parking
situation, he must park his car three‐quarters of a mile away from his apartment
and it takes him 15 minutes to walk to his car. Once in his car, he drives an
average of 45 mph to campus. Since Jon is a cheapskate, he parks in Verano Place
and then walks 18 minutes to the physics building. Alternatively, if Jon bikes to
campus, he rides his bike an average speed of 12 mph for the entire journey to
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.
 Fall '11
 whiteson
 International System of Units, Alice and Bob, Monterey Jack, Jack cheese

Click to edit the document details