Thread: Help with trigonometry question

Hi, i need help in this trignometry question and i don't quite understand how to solve it this question is dealing with the equation:

y-k sin or cos (x-h)
---- = -----------------
b a

just in case your not sure

k = vertical shift
b = amplitude
h = horizontal shift
a = period

here is the question:

a tire with a diameter of 63 cm coasts at 1.6 m/s over a nail at exactly 12:00 noon. the nail is stuck in the tire but does not deflate

a. how high above the ground will the nail be at:
1. 12:00:08
2. 12:00:15
3: 12:01:00
4: 12:15:00

b. Find the first four times the nail at 10 cm above the ground

thanks! i really need to understand this question

Originally Posted by lauangela

Hi, i need help in this trignometry question and i don't quite understand how to solve it this question is dealing with the equation:

y-k sin or cos (x-h)
---- = -----------------
b a

just in case your not sure

k = vertical shift
b = amplitude
h = horizontal shift
a = period

here is the question:

a tire with a diameter of 63 cm coasts at 1.6 m/s over a nail at exactly 12:00 noon. the nail is stuck in the tire but does not deflate

a. how high above the ground will the nail be at:
1. 12:00:08
2. 12:00:15
3: 12:01:00
4: 12:15:00

b. Find the first four times the nail at 10 cm above the ground

thanks! i really need to understand this question

the first thing you need to determine is the period of up and down motion for the nail.



period,

at , the nail is on the ground and rises to a height of 63 cm at

since the cycle starts at a low point (h = 0) , goes up to a height of h = 63 cm and back down, a negative cosine curve is probably the best model to simulate the motion of the nail up and down over time.



where h is height above the ground in cm and t is time in seconds.

thanks for the reply but i am still very confuse about the whole thing

what about the
1. 12:00:08
2. 12:00:15
3: 12:01:00
4: 12:15:00

how high?

im sorry but i'm just confuse by the whole work

i need to identify the periods, amplitude, horizontal and vertical shift but then i can't see it and overall confuse

Originally Posted by lauangela

thanks for the reply but i am still very confuse about the whole thing

what about the
1. 12:00:08
2. 12:00:15
3: 12:01:00
4: 12:15:00

how high?

im sorry but i'm just confuse by the whole work

i need to identify the periods, amplitude, horizontal and vertical shift but then i can't see it and overall confuse

If you cannot determine this information given the height equation and graph provided, then you need to have a talk with your instructor.