- #1
PJH20
- 2
- 0
I really need helpo with this question. I am having to revise over easter for the three week break and i need a solution to this. I have all the past exam papers but the lecturere doesn't have any past paper solutions and his lecture notes are vague. TO top it off i wondered if there were any good books with worked examples and questions?
Here is my problem.
At time t, the position vector of a point P, on a fairground ride is given by:
r(t) = (2cost + cos4t)i + (2sint + sin4t)j m
Find its acceleration, F, at time t. Show that:
|f|^2 = 260 + 64 cos3t m^2s^-4
Ok that's the problem.
Now i have managed to get the velocity by differentiation and then the acceleration which works out to be:
a(t) = (-2cost-16cos4t)i + (-2sint-16sin4t)j
But i can't then get this expression to work out to |f|^2 = 260 + 64 cos3t...
Can anyone help?
Here is my problem.
At time t, the position vector of a point P, on a fairground ride is given by:
r(t) = (2cost + cos4t)i + (2sint + sin4t)j m
Find its acceleration, F, at time t. Show that:
|f|^2 = 260 + 64 cos3t m^2s^-4
Ok that's the problem.
Now i have managed to get the velocity by differentiation and then the acceleration which works out to be:
a(t) = (-2cost-16cos4t)i + (-2sint-16sin4t)j
But i can't then get this expression to work out to |f|^2 = 260 + 64 cos3t...
Can anyone help?
Last edited: