Homework Help: Position and acceleration

1. Apr 15, 2017

mike32

1. The problem statement, all variables and given/known data
All numerical constants are in the appropriate units, so that R (t) in units of meters, and a = 3.1 sec-1.

What is acceleration size (in meters per second ^ 2) t = 1 / 1.1 sec?

Note: When calculating sin (at), make sure the computer is in radian mode.

2. Relevant equations
R(t)= 8.4sin(at) +(3.1e^(-7t)) +6.9t^3

3. The attempt at a solution
Couldn't get to a solution

2. Apr 15, 2017

Nidum

Please try to explain this problem more clearly . Post the complete original wording of the problem as given to you if possible

3. Apr 15, 2017

mike32

R (t) in meters and a= 3.1 sec^-1

What is its acceleration (m/s^2) in t = 1 / 1.1 seconds?

4. Apr 15, 2017

haruspex

How do you go from an expression for position to one for acceleration?
Do you mean literally $\frac {1}{1.1}$ seconds? That is a very odd way to specify the time.

Last edited: Apr 15, 2017
5. Apr 15, 2017

mike32

ok. but this is data in question.

6. Apr 15, 2017

haruspex

Ok, so answer my first question.

7. Apr 15, 2017

mike32

Have to cut twice the equation and put t