A moving sidewalk in an airport moves people between gates. It takes Jason's 9 -year -old daughter Josie 40 sec to travel 200 ft walking with the sidewalk. It takes her 30 sec to walk 90 ft against the moving sidewalk (in the opposite direction).Find the speed of the sidewalk and find Josie's speed walking on non-moving ground. (See Example 8)
A moving sidewalk in an airport moves people between gates. It takes Jason's 9 -year -old daughter Josie 40 sec to travel 200 ft walking with the sidewalk. It takes her 30 sec to walk 90 ft against the moving sidewalk (in the opposite direction).Find the speed of the sidewalk and find Josie's speed walking on non-moving ground. (See Example 8)
A moving sidewalk in an airport moves people between gates. It takes Jason's
9
-year
-old daughter Josie
40
sec
to travel
200
ft
walking with the sidewalk. It takes her
30
sec
to walk
90
ft
against the moving sidewalk (in the opposite direction).Find the speed of the sidewalk and find Josie's speed walking on non-moving ground. (See Example 8)
Several designers created scale drawings of a new technology lab. Each designer used a different
scale. The rectangular base of a 3-D printer is 4.5 feet by 3 feet. In Nika's drawing, the base of the
printer is 3 inches by 2 inches. If Nika enlarges her drawing to 3 times its size, what will be the scale
of her enlarged drawing? Explain.
The scale will be 1 inch =
=foot. In the enlarged drawing, the printer's longer base edge is inches
foot
and its shorter base edge is inches. Since
the scale factor, k, is
1 inch
A state trooper is hidden 30 foot from a highway. One second after a truck
passes, the angle 0 between the highway and the line of observation from the
patrol car to the truck is measured. See the illustration. Complete parts (a)-(c).
(a) If the angle measures 16, how fast is the truck traveling? Express the answer in feet per second and in miles per hour.
If the angle measures 16", the speed of the truck is 104.62 feet per second.
(Do not round until the final answer. Then round to two decimal places as needed.)
If the angle measures 16", the speed of the truck is 71.3 miles per hour.
(Use the answer from part (a) to find this answer. Round to one decimal place as needed.)
(b) If the angle measures 32", how fast is the truck traveling? Express the answer in feet per second and in miles per hour.
If the angle measures 32", the speed of the truck is feet per second.
(Do not round until the final answer. Then round to two decimal places as needed.)
II
Thomas' Calculus: Early Transcendentals (14th Edition)
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