7. A particle's velocity is described by v(t) = (et sin(t), et, et cos(t)) for t = [0, 5]. (a) If the particle's initial position is (-½, 1, 1), describe its position r(t) and acceleration a(t) as functions of t. Hint: (e¹ (sint + cost)) = 2e¹ cost and (e¹ (sin t – cos t)) = 2e¹ sint. (b) Verify that the particle's path lies on a circular cone of the form y² = a²(x² + z²) for some a (which?) and sketch the path. (c) What is the length of the particle's path from t = 0 tot = 5?
7. A particle's velocity is described by v(t) = (et sin(t), et, et cos(t)) for t = [0, 5]. (a) If the particle's initial position is (-½, 1, 1), describe its position r(t) and acceleration a(t) as functions of t. Hint: (e¹ (sint + cost)) = 2e¹ cost and (e¹ (sin t – cos t)) = 2e¹ sint. (b) Verify that the particle's path lies on a circular cone of the form y² = a²(x² + z²) for some a (which?) and sketch the path. (c) What is the length of the particle's path from t = 0 tot = 5?
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