Question: 1. The distance d a spring is stretched can be calculated using the formula d = 2U/k where U is the potential energy and k

1. The distance d a spring is stretched can be calculated using the formula
d = √2U/k where U is the potential energy and k is the spring constant. Solve the formula for U.
2. The circumference C of an ellipse with major axis length 2a and minor axis length 2b can be approximated using the formula below. Solve the formula for a.
C ≈ 2π√a2 + b2/2

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