A) Suppose that the net resistance comes from two resistors in series: R=R1+R2. Assume that you measure each resistor independently, multiple times in multiple ways, obtaining these mean values and uncertainties: R1={1.234+/-0.016} Ohms and R2={3.142+/-0.017} Ohms. The mean value of the net resistance is (of course): R=4.376 Ohms. Calculate the net uncertainty in this value of R (also in Ohms).

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Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)