hi what is this question asking | Mathematics | Page 1

gloomy hamlet Oct 23, 2024, 10:39 AM

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QUESTION 1B, its just asking for the period right so itd just be 2PI/15, what does it mean by tide variation

gray breachBOT Oct 23, 2024, 10:39 AM

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gloomy hamlet QUESTION 1B, its just asking for the period right so itd just be 2PI/15, what do...

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gloomy hamlet Oct 23, 2024, 10:42 AM

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omg i cant why is this so hard

polar trench Oct 23, 2024, 10:45 AM

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Tide is just the rising and falling of the water. The variation in height should be the period, you are correct.

mental knoll Oct 23, 2024, 10:45 AM

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which one is 1B?

polar trench Oct 23, 2024, 10:46 AM

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I think they mean 2b

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Since they discuss period of 2π/15

mental knoll Oct 23, 2024, 10:46 AM

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oh, right

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“height variation” is just a way to describe the function tracking the tide height (2sin(15x)+3)

polar trench Oct 23, 2024, 10:51 AM

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I was just trying to recall the formula for period. Is it 2π\B ?

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So I think everything checks out!

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It was just weird wording since the model represents height of tide, yet the answer is asking for the period. So I could see that being confusing

gloomy hamlet Oct 23, 2024, 10:52 AM

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oh okay thank youu

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what abt c?

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is it just

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idek atp

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how do u find max and min again

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is it b x the period

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wait no its d plus minus A right

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but theres no d

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so its just -2 and positive 2?

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@polar trench

polar trench Oct 23, 2024, 10:54 AM

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It looks like you have a +3

gloomy hamlet Oct 23, 2024, 10:54 AM

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isnt that c?

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ohhh wait

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its not in brackets

mental knoll Oct 23, 2024, 10:54 AM

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that shouldn’t affect the time taken to travel from minimum to maximum

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you may note that the period describes the time between two minimum points, and a maximum always occurs in the middle of two minimums

mental knoll Oct 23, 2024, 10:56 AM

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gloomy hamlet so its just -2 and positive 2?

alternatively, you may also choose to find their values (as twitch said, add 3) and then find the times where these values are attained

polar trench Oct 23, 2024, 10:56 AM

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@mental knoll is correct, the heights will be between -2+3=1 to 2+3=5, but they are asking about the distance along the horizontal axis

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So the easiest strategy is to divide your period in half as suggested

gloomy hamlet Oct 23, 2024, 10:59 AM

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is it 6 for maximum and then -6 for minimum??

gloomy hamlet Oct 23, 2024, 10:59 AM

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polar trench So the easiest strategy is to divide your period in half as suggested

oh wait what

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so the place between my maximum and minimum is the the period in half?

polar trench Oct 23, 2024, 11:00 AM

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If the period is 2π/15 this gives you the horizontal distance from maximum to maximum, so yeah you got it! Half that is what we want

gloomy hamlet Oct 23, 2024, 11:01 AM

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wait what abt the 6 and -6?

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was that incorrect

polar trench Oct 23, 2024, 11:01 AM

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Again it's a bit weird since the number of hours is pi/15 and not a whole number

gloomy hamlet Oct 23, 2024, 11:01 AM

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polar trench If the period is 2π/15 this gives you the horizontal distance from maximum to ma...

so would it be 2pi/30

gloomy hamlet Oct 23, 2024, 11:01 AM

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polar trench Again it's a bit weird since the number of hours is pi/15 and not a whole number

this is so confusingg

mental knoll Oct 23, 2024, 11:02 AM

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gloomy hamlet so would it be 2pi/30

simplify that

gloomy hamlet Oct 23, 2024, 11:02 AM

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pi/15?

polar trench Oct 23, 2024, 11:03 AM

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gloomy hamlet wait what abt the 6 and -6?

The max and min should be at 1 and 5 I believe

gloomy hamlet Oct 23, 2024, 11:03 AM

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yes

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wait let me show u

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my working

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polar trench Oct 23, 2024, 11:05 AM

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gloomy hamlet Oct 23, 2024, 11:06 AM

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wait so

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im trying to find the mean line aka between the max and min line

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?

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and that is half the period?

polar trench Oct 23, 2024, 11:07 AM

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I was just trying to show that the mins all happen at 1 and the maxes all at 5 with the picture

gloomy hamlet Oct 23, 2024, 11:08 AM

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yes

polar trench Oct 23, 2024, 11:08 AM

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gloomy hamlet and that is half the period?

Yes π\15 is the distance from one max to one min

gloomy hamlet Oct 23, 2024, 11:08 AM

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ahhh

polar trench Oct 23, 2024, 11:09 AM

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gloomy hamlet

I think your calculator must be in degrees since you get 90 and -90

gloomy hamlet Oct 23, 2024, 11:09 AM

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oh should i be getting radians?

polar trench Oct 23, 2024, 11:09 AM

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Yes that would help a bit

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What you were doing is correct if you want to find an x value where you get a max or min, but we need radians instead of degrees

gloomy hamlet Oct 23, 2024, 11:12 AM

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i got 1.5708

polar trench Oct 23, 2024, 11:12 AM

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Awesome!

gloomy hamlet Oct 23, 2024, 11:13 AM

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is that correct!!?

polar trench Oct 23, 2024, 11:13 AM

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Yep that's what I got for sin inverse of 1. Now divide by 15 to get the x value of interest

mental knoll Oct 23, 2024, 11:14 AM

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polar trench Yep that's what I got for sin inverse of 1. Now divide by 15 to get the x value ...

that is π/2, yes

polar trench Oct 23, 2024, 11:14 AM

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Correct

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@mental knoll are you able to jump in Imma try to fall back asleep lol

gloomy hamlet Oct 23, 2024, 11:15 AM

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wait

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oop yes go to sleep

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thank u

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@mental knoll

mental knoll Oct 23, 2024, 11:15 AM

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polar trench <@456226577798135808> are you able to jump in Imma try to fall back asleep lol

i suppose i could

gloomy hamlet Oct 23, 2024, 11:16 AM

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OOP SORRY

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hold on

polar trench Oct 23, 2024, 11:16 AM

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I was just trying to connect my graph to the maxes and mins. I think you'll need that solving strategy we just used for the last part.

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But I'm sweepy

mental knoll Oct 23, 2024, 11:17 AM

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you should sleep then

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is this still 2c?

gloomy hamlet Oct 23, 2024, 11:19 AM

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2 d now

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im trying it

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i make the h = 4?

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@mental knoll is it 0.034933

mental knoll Oct 23, 2024, 11:22 AM

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for 2d?

gloomy hamlet Oct 23, 2024, 11:23 AM

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yes

mental knoll Oct 23, 2024, 11:24 AM

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i think you should have more times than that

gloomy hamlet Oct 23, 2024, 11:24 AM

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wdym

mental knoll Oct 23, 2024, 11:25 AM

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2d asks for the time(s) when the tide height is 4 meters

gloomy hamlet Oct 23, 2024, 11:25 AM

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how do i solve it?

mental knoll Oct 23, 2024, 11:25 AM

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are you sure this is in radians and not degrees?

gloomy hamlet Oct 23, 2024, 11:26 AM

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yes

mental knoll Oct 23, 2024, 11:26 AM

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i think the questions would make more sense if they were degrees

gloomy hamlet Oct 23, 2024, 11:26 AM

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oh

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thats annyoign

mental knoll Oct 23, 2024, 11:26 AM

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however, i should assume radians, since there is no degrees symbol

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hm

gloomy hamlet Oct 23, 2024, 11:27 AM

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wait so do i switch it?

mental knoll Oct 23, 2024, 11:27 AM

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morally, you shouldn’t

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i would ask for clarification if possible

gloomy hamlet Oct 23, 2024, 11:28 AM

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wait

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okay

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so

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i switched to degrees

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and go 30

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then divided by 15

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and got 2

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wait is this question refering to unit circle

mental knoll Oct 23, 2024, 11:29 AM

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quite possibly

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you are required to find values of t when sin(15t) = 1/2

mental knoll Oct 23, 2024, 11:30 AM

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gloomy hamlet i switched to degrees

would it be possible at all to ask a teacher for clarification?

gloomy hamlet Oct 23, 2024, 11:30 AM

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uh this wasnt from a teacher

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its from a friend 😢

gloomy hamlet Oct 23, 2024, 11:30 AM

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mental knoll you are required to find values of t when sin(15t) = 1/2

oh

mental knoll Oct 23, 2024, 11:33 AM

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gloomy hamlet its from a friend 😢

could you ask the friend?

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it’s ok if you can’t

gloomy hamlet Oct 23, 2024, 12:11 PM

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its okay

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thank u tho

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+close

worthy deltaBOT Oct 23, 2024, 12:12 PM

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gloomy hamlet +close

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#hi what is this question asking