Because the block is not moving, the sum of the x components of the forces acting on the block must be zero. find an expression for the sum of the x components of the forces acting on the block, using coordinate system b. express your answer in terms of some or all of the variables fn, ff, fw, and θ.

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill