isabua
03.01.2020 •
Mathematics
Aboat leaves a port traveling due east at 30 mi/hr. at the same tiem another boat leaves
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Ответ:
The perimeter (circumference) of the wheel is:
P
=
2
π
r
=
π
d
=
π
(
27
)
=
27
π
in
This is also the distance the bicycle travels with each revolution of the wheel.
To figure out the number of revolutions of the wheel over a distance of
10
miles, we convert the
10
miles to inches and divide it by
P
:
1
mile
=
63360
inches
10
(
63360
)
=
633600
inches
R
P
H
=
633600
27
π
(this is the number of revolutions in one hour)
We divide this by
60
to get the number of revolutions per minutes or
R
P
M
:
R
P
M
=
633600
27
π
60
=
(
633600
27
π
)
(
1
60
)
=
10560
27
π
=
10560
84.823
=
124.49