An electron in a magnetic field moves along a circle with a radius of 25.4 m with a speed that follows: v(t)=V0e−bt where b = 0.56 s-1and V0 = 170 m/s. I need to find the angular acceleration at t=3.7s, but I don't know how I'm supposed to get that becuase the formula that we have says that it is the second derivative of angular position, but when I calculate angular position all I get is 6.57516 radians. I don't understand how I'm supposed to take a derivative of that since it doesn't have any variables.  I don't know if it is needed for this, but I already calculated the centripetal acceleration as 18.0446m/s^2

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An electron in a magnetic field moves along a circle with a radius of 25.4 m with a speed that follows:

v(t)=V0e−bt

where b = 0.56 s-1and V0 = 170 m/s.

I need to find the angular acceleration at t=3.7s, but I don't know how I'm supposed to get that becuase the formula that we have says that it is the second derivative of angular position, but when I calculate angular position all I get is 6.57516 radians. I don't understand how I'm supposed to take a derivative of that since it doesn't have any variables. 

I don't know if it is needed for this, but I already calculated the centripetal acceleration as 18.0446m/s^2

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