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 1.501.51.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 willsee in a later chapter, mass has units of kg or g and is a different physical quantity than weight, which can have unitsof ounces. But for objects close to the surface of the earth, mass and weight are proportional; we can therefore saythat a certain weight is equivalent to a certain mass.1.52.Set Up:Use your calculator to display We know that 1 andSolve: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 isThe mass of air breathed in one day is the density of air times the volume of air breathed:
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