- #51

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- #51

- 9,559

- 770

- #52

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Multiply by sin45?

- #53

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That answer makes no sense at all. You are asked for a value of ##t## and you reply "multiply by sin45".Multiply by sin45?

- #54

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sorryThat answer makes no sense at all. You are asked for a value of ##t## and you reply "multiply by sin45".

well in order to be 45 degrees Q has to have the same amount of x and y values away from P

eg: if Q if 3i away from Q it should also have 3j away from P

But you have to understand this that I'm trying but I don't know how to use this information to find a t value for this problem

I do understand that Q-P was to find the distance between P and Q at a certain time t

But I don't know how to find t when Q is 45 degrees to P

I'm just having this problem because i'm not used to doing vector type questions.

If it was simple distance and time I could cope.

So please lend me a hand

Thanks to you I can this far and I really appreciate it

- #55

Mark44

Mentor

- 35,123

- 6,865

Now Q-P

From post #43:(2+t)i + (10t-15)j

What relationship has to exist between the i and j coordinates for a vector to point northeast?Yes. Finally!! Now, for what t does that point northeast? What do you require about the components for a vector to point northeast?

- #56

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They have to be positive and same magnitudeFrom post #42:

From post #43:

What relationship has to exist between the i and j coordinates for a vector to point northeast?

- #57

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You could have answered that way back when I asked it in post #43.They have to be positive and same magnitude

So, what value of ##t##, if any, makes that happen for Q-P?

- #58

Mark44

Mentor

- 35,123

- 6,865

Now Q-P

.

.

.

(2+t)i + (10t-15)j

What relationship has to exist between the i and j coordinates for a vector to point northeast?

So what do you get?They have to be positive and same magnitude

- #59

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From post #42:

So what do you get?

Ok I get what your saying

As I mentioned before I'm having such a hard time due to vector with i & j form

I know if it's pointing to NE the values have to be positive and same

I just don't know how to change it or in other words the proper way to do the sum when it comes to vectors

I'm not clear about the "protocol " to change the i and j in relation with time

- #60

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- #61

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I get it now

I have to find out by changing t which changes the values inside the bracket

Hence giving magnitude to i & j

I completely understand

Thank you very much

(2+t)i + (10t-15)j

2+t=10t-15

t-10t=-2-15

-9t=-17

t=-17/-9

t=1.889

- #62

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So that's 1hr 53min 20sec past noon

Thank you very much

And thank you for being so patient with me

Thank you very much

And thank you for being so patient with me

- #63

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You are welcome. I'm curious what math courses you have had or are taking now.

- #64

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Non actually

I just find questions here and there and try to attempt them

I just find questions here and there and try to attempt them

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