1) Three resistors of 4ohms, 5ohms, 3ohms are connected in series and potential difference of 20v is applied across this arrangement. Calculate the current in 4ohm resistor and p. d between it's ends 2) A resistance wire of length 2m and uniform cross sectional area 0.0000005 square metre has resistance of 2.2ohms . Calculate it's resistivity

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

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 (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false