A gas is contained in a piston cylinder device initially at a pressure of 150Kpa and a volume of 0.04cubic meter. Calculate the work dine by the gas when it undergoes the following process to a final volume of 0.1 cubic meter. a)constant pressure b)constant temperature
c)PV to the power 2.35 = constant
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Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Which of the following is an example of units for speed