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The “PAC” acronym stands for “Political Action Committee”, with PACs being significant aspects of the campaign finance aspects of the political system within the US. Regular PACs are subject to spending l...

Generally the past participle doesn’t agree with any noun when the auxiliary verb ‘avoir’ is used. For example: ‘Elles ont acheté des bottes’ despite the subject ‘elles’ and the direct object ‘bott...

The two forces acting on the object are weight due to gravity pulling the object towards earth, and drag resisting this motion. When the object is first released, drag is small as velocity is low, so the ...

A catalyst is a substance which provides an alternative pathway requiring a lower activation energy for the chemicals to react, and speeds up the rate of reaction. A catalyst also remains chemically uncha...

Integrate by parts: integral = [uv] - ∫u'v dx (u'= derivative of u, v'= derivative of v)

u= x     u'= 1

v' = sin2x        v= -0.5cos2x

= -0.5xcosx  -  ∫-0.5cos2x dx

= -0.5xcosx...