Motion: Money Supply

Money, money everywhere. Do you have some of it? If yes, how did you get it? If no, why don't you have it?

Identity: Money

What is money?

The development of ancient communities into trading communities, brought about the need for a generally accepted medium of exchange and unit of accounting, for the selling and buying of goods and services...


Change: Linear PDEs.

What is the difference between linear and non-linear partial differential equations (PDEs)?

Change: PDEs

What are PDEs?

In mathematics, PDE is the acronym for ...

Equilibrium: Balance That Beam

Figure B1 is an illustration of a beam. The loads and lengths are given as follows:
Load at B = 5,000lbs, AB = 5ft; Load at C = 15,000lbs, BC = 3ft; Load at D = 25,000lbs, CD = 2ft;
Calculate the reactions R1 and R2 at the supports if the distance between the supports is 20ft.

Force: An Employer's Problem

Why are professional office jobs considered as work eventhough they fail to meet the strict definition of work as defined by physicists?

Equilibrium: The Inclined Plane

The block in fig. E1 is on an inclined plane. W is the weight of the block, N is the normal to the plane. F is the friction between the block and the incline plane.
(a) Will the block slide down the plane If the angle of repose (usually denoted by θ) is greater than the angle b?
(b) Express the coefficient of friction, μ in terms of the angle of repose.
(c) Express the force required to keep the block stationary on the plane in terms of W and b If the angleb is greater than the angle of repose

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