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Explain how fluorescent tubes work

Fluorescent tubes are filled with low pressure mercury, when an electric current is passed through, the electrons in mercury are excited and move to a high energy level, this high level state is unstable and...
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Answered by Michael W. • Physics tutor
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What four factors influence the rate of reaction?

Temperature, pressure, surface area and concentration all affect the rate of a chemical reaction. Temperature makes the particles more energetic and increases the frequency of collisions Pressure, surface ar...
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Answered by Michael W. • Chemistry tutor
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Find the coordinates that correspond to the maximum point of the following equation: y = −16x^2 + 160x - 256

To solve this problem, the maximum and minimum points of equations can be deduced through the differentiation process. This looks at the gradient of the function and the maximum/minimum value occurs when the...
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Answered by Michael W. • Maths tutor
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Find the factors of x^3−7x−6

To find the factors of x 3 -7x-6, a method called equating coefficients can be used. Firstly, set the equation to zero and find a suitable number which satisfies the equation, in this case x=-1 satisfies the...
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Answered by Michael W. • Maths tutor
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A ball of mass 0.7 kg strikes the wall at an angle of 90 degrees with speed 72 km/h. Consider that the bounce lasts for 0.1 s and is perfectly elastic. What is the magnitude of the average reaction force from the wall that acts on the ball?

initial speed: v = 72 km/h = 20 m/s. mass: m = 0.7 kg time of the impact: t = 0.1 s average force: F The speed after impact is the same as initial speed, but velocity has got the opposite direction. Therefor...
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Answered by Filip M. • Physics tutor
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