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Lynna [10]
4 years ago
12

The 16.0-in. spring is compressed to a 9.9-in. length, where it is released from rest and accelerates the sliding block A. The a

cceleration has an initial value of 420 ft/sec2 and then decreases linearly with the x-movement of the block, reaching zero when the spring regains its original 16.0-in. length. Calculate the time t for the block to go (a) 3.05 in. and (b) 6.1 in.
Physics
1 answer:
Jlenok [28]4 years ago
6 0

Answer:

Part a : Time required for the block to go to 3.05 in is 0.036 s

Part b : Time required for the block to go to 6.1 in is 0.054 s

Explanation:

The acceleration is given as

a=a_o-kx

Here

  • a_o is the initial acceleration which is given as 420 ft/s^2
  • k is the spring constant which is calculated as follows

                                      k=\frac{a_o}{l_c-l_{uc}}

  • Here lc is the compressed length of the spring
  • and Iuc is the uncompressed length of the spring so  the value of k is

                                   k=\frac{420}{\frac{16-9.9}{12}}\\k=826.22 s^{-2}

So now the equation becomes

a=420-826.23x

As per relation of acceleration to velocity

vdv=adx

\int\limits^v_0 {v} \, dv =\int a dx

\frac{v^2}{2} =\int (420-826x) dx

\frac{v^2}{2} =420x-413x^2

{v^2}=840x-826x^2\\{v}=\sqrt{840x-826x^2}\\

Also

v=\frac{dx}{dt}

So

\frac{dx}{dt}=\sqrt{840x-826x^2}\\

Solving for dt and integrating results in

{dt}=\frac{dx}{\sqrt{840x-826x^2}}\\\int\limits^t_0 \,dt=\int\limits^x_0 \,\frac{dx}{\sqrt{840x-826x^2}}\\t=\int\limits^x_0 \,\frac{dx}{\sqrt{840x-826x^2}}

Now using this equation value for both parts can be calculated numerically as

Part a 3.05 in

x=\frac{3.05}{12}\\x=0.254 ft

Solving numerically for this value of x

t=\int\limits^{0.254}_0 \,\frac{dx}{\sqrt{840x-826x^2}}\\t=0.036 s

Time required for the block to go to 3.05 in is 0.036 s

Part b 6.1 in

x=\frac{6.1}{12}\\x=0.504 ft

Solving for this value of x

t=\int\limits^{0.504}_0 \,\frac{dx}{\sqrt{840x-826x^2}}\\t=0.0543 s

Time required for the block to go to 6.1 in is 0.054 s

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