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1.50. Set Up:
Use coordinates for which
is east and
is north. The driver’s vector displacements are:
Solve:
north of east. This result is confirmed by the sketch in Figure 1.50.
Figure 1.50
1.51. Set Up:
We know that an object of mass 1000 g weighs 2.205 lbs and
Solve:
and
The acceptable limits are 142 g to 149 g.
Reflect:
The range in acceptable weight is
Since
the range in mass of 7 g is consistent. As we will
see in a later chapter, mass has units of kg or g and is a different physical quantity than weight, which can have units
of ounces. But for objects close to the surface of the earth, mass and weight are proportional; we can therefore say
that a certain weight is equivalent to a certain mass.
1.52. Set Up:
Use your calculator to display
We know that 1
and
Solve:
The approximate expression is accurate to two significant figures.
1.53. Set Up:
Estimate 12 breaths per minute. We know
and
Solve: (a)
The volume of air breathed in one day is
The mass of air breathed in one day is the density of air times the volume of air breathed:
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg

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