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A joint is moving at an angular velocity of 
0.2e^(0.2 t) radians per second (where 
t is the time in seconds since the joint was at rest).
Through how many radians does the joint move between 
t=1 and 
t=3 ?
Choose 1 answer:
(A) 
e^(0.4)
(B) 
e^(0.6)-e^(0.2)
(C) 
0.2(e^(0.6)-e^(0.2))
(D) 
0.2e^(0.4)

A joint is moving at an angular velocity of 0.2e0.2t 0.2 e^{0.2 t} radians per second (where t t is the time in seconds since the joint was at rest).\newlineThrough how many radians does the joint move between t=1 t=1 and t=3 t=3 ?\newlineChoose 11 answer:\newline(A) e0.4 e^{0.4} \newline(B) e0.6e0.2 e^{0.6}-e^{0.2} \newline(C) 0.2(e0.6e0.2) 0.2\left(e^{0.6}-e^{0.2}\right) \newline(D) 0.2e0.4 0.2 e^{0.4}

Full solution

Q. A joint is moving at an angular velocity of 0.2e0.2t 0.2 e^{0.2 t} radians per second (where t t is the time in seconds since the joint was at rest).\newlineThrough how many radians does the joint move between t=1 t=1 and t=3 t=3 ?\newlineChoose 11 answer:\newline(A) e0.4 e^{0.4} \newline(B) e0.6e0.2 e^{0.6}-e^{0.2} \newline(C) 0.2(e0.6e0.2) 0.2\left(e^{0.6}-e^{0.2}\right) \newline(D) 0.2e0.4 0.2 e^{0.4}
  1. Integrate angular velocity function: The angular displacement of the joint can be found by integrating the angular velocity function with respect to time over the interval from t=1t=1 to t=3t=3.
  2. Given angular velocity function: The angular velocity function is given by ω(t)=0.2e0.2t\omega(t) = 0.2e^{0.2t}. To find the angular displacement, we integrate this function from t=1t=1 to t=3t=3.
  3. Evaluate integral with constant: The integral of ω(t)=0.2e0.2t\omega(t) = 0.2e^{0.2t} with respect to tt is (0.20.2)e0.2t=e0.2t+C(\frac{0.2}{0.2})e^{0.2t} = e^{0.2t} + C, where CC is the constant of integration.
  4. Evaluate integral from t=1t=1 to t=3t=3: We evaluate the integral from t=1t=1 to t=3t=3, which gives us e(0.23)e(0.21)=e0.6e0.2e^{(0.2\cdot 3)} - e^{(0.2\cdot 1)} = e^{0.6} - e^{0.2}.
  5. Final angular displacement calculation: We multiply the result by the coefficient 0.20.2 to get the final angular displacement: 0.2(e0.6e0.2)0.2(e^{0.6} - e^{0.2}).

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