- #1

JoanF

- 17

- 0

## Homework Statement

mass of A=5,0kg

mass of B=2,0kg

friction coefficient between A and the plan=0,30

The system is moving with an acceleration of 7,5 m /s^2 and the angle theta is constant and equals to 37º.

Then, a mechanism makes the body A and the body B stops. B stop when it is in the position of the figure and it begins to oscillate in an simple harmonic motion.

lenght of the wire that connects A to B = 0,85 m

1) Calc the value of the frequency of pendulum motion.

2)Write the equation of the elongation of the motion of body B.

3) Calc the value of the maximum velocity of the motion and the first instant in which that velocity is reached.

## Homework Equations

## The Attempt at a Solution

1)it gaves me 1,83 but it's wrong

2) x(t)=Asin(wt+Q)

A=0,51

f=1,83

Q= -pi/2 (this is wrong but I don't know why =S )

x(t)=0,51sin(11,5t-pi/2)

3) v(t)=[x(t)] '

a(t)= [v(t)] '

v_max => a(t) = 0 <=> v_max=5,9 m/s

I haven't done the instant because this was already wrong