you are an engineer in charge of designing a new win Agricultural College -PHYS

Question

you are an engineer in charge of designing a new win Agricultural College -PHYS 11 Fall7 SEATActivities and Due Dates HW: 1D Kinematics 09/12/2017 11:55 PM 031.11100 Gradebook Print |Calculator Periode Table Question 9 of 19 Sapling Learning Map You are an Empire State in charge of designing a new generation of elevators for a prospective to the Before the state legislature votes on e a report on the benefts of the tme it wil take the elevator to go from the ground for the project, they would like you to ng the elevators. One of the numbers that they have requested floor to the 102nd floor observatory. They are unlikely to approve the project uniess the new elevators make the trip much faster than the old elevators it state law mandates that elevators cannot accelerate at greater than 3,60 mis or travel faster than 16 8 mis, whast is the minimum time in which observatory floor? an elevator can travel the 373 m from the ground floor to the 100 O Web O Techn 10 0

Explanation / Answer

during accelerating to the maximum speed.

vf = vi + a t

16.8 = 0 + 3.60 t

t1 = 4.67 sec

distance travelled, d1 = vi t + a t^2 /2

d1 = (0 x 4.67) + (3.60 x 4.67^2 / 2)

d1 = 39.2 m

same will be for decelerating finally,

so distance travelled with maximum speed = 373 - 2(39.2)

= 294.6 m

t2 = 294.6 / 16.8 = 17.54

total time = 2t1 + t2

= 26.9 sec

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