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F=ma, so a=F/m giving a=2.4m/s^2. When t=9s, v=at, so v=21.6m/s. Friction force is Ff = μF(normal), which is Ff = μmg, so Ff = 6670.8N (if g = 9.81m/s^2). Frictional force always acts against the directio...

The Red Army won due to a mixture of their strengths and the Whites' incompetence. Trotsky was a great leader and had an effective military strategy - by contrast, the Whites were disorganised and had poo...

The main three trigonometric functions are the tangent (tan), sine (sin) and cosine (cos) functions. The tangent, sine and cosine of an angle is defined in terms of the ratios of the length of sides of a ...

In normal levels serotonin can have a calming, inhibitory effect on neural firings in the brain. However, in low levels the inhibitory effect of serotonin is removed. This results in individuals being les...

Augustus was the first emperor of Rome and was heavily concerned with securing his own legitimacy and creating a long-lasting legacy for himself. One of the ways in which he did this was by writing himsel...