## Best_Mathematician 2 years ago what is the vector function that models the behavior

1. Best_Mathematician
2. Best_Mathematician

last two questions...cant understand

3. phi

Didn't you already do this ? you have a sin t that you want to rotate faster to make it rotate twice as fast, use sin(2t) (and cos(2t) ) and keep everything else the same.

4. Best_Mathematician

ya but last 2

5. phi

as I remember, in the first part, the hoop has a diameter of 2, and a radius of 1 for the next part, I think you want a hoop with 1/2 the diameter, so its mark hits the floor twice as often. that means its radius will be 1/2 and its diameter 1

6. Best_Mathematician

ok so whats the answer for d?

7. phi

r=(t- 0.5*sin(2t) ) i + (0.5 - 0.5 cos(2 t)) j

8. Best_Mathematician

is that d???

9. phi

I think so

10. Best_Mathematician

ya i gatcyu...so how should i graph that ???

11. phi

I don't know what graphing tools you have.

12. Best_Mathematician

wolframalpha

13. Best_Mathematician

i know upto here but how to plot themm

14. Best_Mathematician
15. Best_Mathematician

thx