Question
1)the gateway arch, which can be closely approximated by a parabola, is 630 feet high and 630 feet across at the base. The Gateway arch is the tallest man-made monument found in the United States in St. Louis Missouri. The maintenance crew is doing some work on the arch. The work will be done on the right side of the arch. In order to bring the equipment up the maintenance crew has constructed a temporary ramp from the ground on left side of the arch to the level where the work will be done on the right side. The ramp has a constant rate of rise of 1:5, which means 1 ft. up for every 5 ft. forward.
On the figure below, make a rough sketch of what you think the arch with the ramp would look like.
On the figure below, make a rough sketch of what you think the arch with the ramp would look like.
Answers
If the vertex of the parabola is at (0,630), then the arch is modeled by
y = (630/315^2)(315^2-x^2)
= 630 - 2/315 x^2
If the work is being done at a position c ft to the right of the vertex, it will be at the point (c,y(c)), on a line with slope 1/5.
Unfortunately, this makes for some very long ramps. If they're working at a point at height 376 ft (x=200), the ramp has to start out 1365 ft to the left of the arch. That's about 1/4 mile away!
y = (630/315^2)(315^2-x^2)
= 630 - 2/315 x^2
If the work is being done at a position c ft to the right of the vertex, it will be at the point (c,y(c)), on a line with slope 1/5.
Unfortunately, this makes for some very long ramps. If they're working at a point at height 376 ft (x=200), the ramp has to start out 1365 ft to the left of the arch. That's about 1/4 mile away!
Related Questions
the gateway arch is the tallest man-made monument found in the united states in St. Louis missouri....
The Gateway Arch in St. Louis, Missouri is not a parabola but a shape known as a catenary. The name...
A large doorway has the shape of a parabolic arch. The doorway is 20 feet high at the top of the arc...
The entrance way of the city of North Bay used to be an arch that can be modelled by the equation of...