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A car of mass 800 kg is accelerated horizontally by constant net force of 1920 N for 9 s. It then breaks for 2 s, but drives off a 5 m high cliff. If μ = 0.85, what is the total horizontal distance travelled by car and its velocity? Ignore air resistance.

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 direction o...
MK
Answered by Martin K. • Physics tutor
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Why did the Red Army win the Russian Civil War?

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 poor e...
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Answered by Catherine W. • History tutor
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What are the trigonometric functions?

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 rig...
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Answered by Julu L. • Maths tutor
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Discuss the role of neural and/or hormonal mechanisms in aggression (8 marks+ 16 marks)

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 less a...
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Answered by Bethan P. • Psychology tutor
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Is Virgil's Aeneid a pro-Augustan epic?

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 himself i...
HS
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