Quiz 1 Explanation
1)
130
km
hr
×
1
mi
1.60934
km
=
80.78
mi
hr
Note that if you round up or down your result or your conversion factor, your number may
be slightly different. If that happens in the future, chose the most similar answer
2)
130
km
hr
×
1000
m
1
km
×
1
hr
3600
sec
=
36.11
m
sec
3)
80
mi
hr
×
1.60934
km
1
mi
=
128.75
km
hr
4)
7.58
g
cm
3
×
1
kg
1000
g
×
1000000
cm
3
1
m
3
=
7,580
kg
m
3
Note that, while 1 m is equal to 100 cm, 1 m
3
is equal to 1,000,000 cm
3
. Remember to always
square or cube the conversion factor!
5)
7,580
kg
m
3
×
2.20462
lb
1
kg
×
1
m
3
35.3147
lb
3
=
473.20
lb
ft
3
6) Multiply both sides by V:
ρ ×V
=
m
V
×V
On the right side, V cancels out:
m
=
ρ×V
7) Multiply again both sides by V:
ρ ×V
=
m
V
×V
m
=
ρ×V
Now, divide both sides by ρ:
m
ρ
=
V
8) Given the equation v=d/t, solve for time:
