1. What's the uncertainty of measured area for a rectangle with width 15.0 +- 0.3 cm and length 20.0 +- 0.2 cm, assuming the width and length measurements are uncorrelated? (A) 0.06 (B) 6.71 (C) 8.50 (D) 9.00 [cm²]

4. A point-like bug of mass m lies on the rim of a uniform disk of mass M that can rotate freely about its center. Initially the bug and disk rotate together with an angular velocity ω₀. Then the bug walks half way to the center of the disk. What is ratio of the new kinetic energy of the system to its initial kinetic energy? (A) (4m+2M)/(m+2M) (B) (m+2M)/(4m+2M) (C) (2m+4M)/(2m+M) (D) (2m+M)/(2m+4M)

1. What's the uncertainty of measured area for a rectangle with width 15.0 +- 0.3 cm and length 20.0 +- 0.2 cm, assuming the width and length measurements are uncorrelated?
(A) 0.06
(B) 6.71
(C) 8.50
(D) 9.00 [cm²]

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