A modified version of a problem in the textbook shows an oil tanker moving at 3 m/s whose projected bow area is 4x103 m2. Assuming the water rho is 1030 kg/m3 and the μ is 1.14x10-3 N·s/m2 determine the friction drag on the hull if the length of the ship is 300 m. Your answer should have 3 significant figures and units of kN.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.