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A ball is projected vertically upwards from the ground with speed 21 ms^–1. The ball moves freely under gravity once projected. What is the greatest height reached by the ball?

Set out information given in question, and taking the upward direction to be positive: s (displacement) = ?, u (initial speed) = 21ms -1 , v (final speed at maximum height) = 0ms -1 , a (acceleration when fa...
SS
Answered by Shruti S. • Maths tutor
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Solve 7x + 6 > 1 + 2x

7x + 6 > 1 + 2xFirst, we collect the like terms so we move all the x's to one side and all the integers to the other:5x > -5Then we divide by 5 on each side to find what just x will be.Therefore, x &gt...
JZ
Answered by Juliet Z. • Maths tutor
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What is the photoelectric effect and how does it provide evidence for the quantisation of electromagnetic radiation?

(Many students have an intuitive understanding of the photoelectric effect and how it demonstrates quantisation, but it is important when preparing for an exam to be able to explain this clearly and precisel...
RP
Answered by Rohit P. • Physics tutor
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In 'Never Let Me Go', what is the relationship between the clones and normality?

You can approach this question about the dystopian novel from multiple perspectives. You could consider the reader’s viewpoint on the clones. Kazuo Ishiguro slowly unveils the fact that the students at Hails...
JB
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Explain the concept of bandwidth with regard to a real op-amp and how this differs from the ideal op-amp.

Ideal op-amps are considered to have infinite open loop gain at any frequency, meaning that in a feedback circuit the output voltage will always be as large as it needs to be to bring the potential differenc...
AL
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