Two weights are hung over two frictionless pulleys that are connected by a wire rope to a 500 lb horizontal block that are in between and below them. The wire rope attached to the upper left end of the block and to the left pulley is at 45 degrees with the horizontal and the wire rope that connects the upper right end of the block to the right pulley is at 30 degrees with the horizontal. If the weight on the left pulley is 50 lb, fs= 0.30 and fk 0.20 on the surface of block what weight W on the right pulley will cause the 500 Ib block to just start moving to the right? *

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.