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A rollercoaster stops at a point with GPE of 10kJ and then travels down a frictionless slope reaching a speed of 10 m/s at ground level. After this, what length of horizontal track (friction coefficient = 0.5) is needed to bring the rollercoaster to rest?

Recognise that the intial potential energy and kinetic energy at 10 m/s position should be identical due to the frictionless slope. mgh = 0.5mv 2 10kJ = 0.5 x m x 10 2 10 000 = 0.5 x m x 100 50m = 10 000 m =...
DM
Answered by Daniel M. • Maths tutor
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Please can you explain E/Z isomers?

1. Assign priority to the four groups attached to the double bond, by adding up their atomic numbers. 2. Work out which are the two highest priority (highest atomic number) - one on each carbon. 3. If these ...
JB
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How should I approach my extended project?

- Get s tarted as early as possible - As soon as you have a potential topic, start researching and gathering information! - Make sure to attend meetings with your mentor - They have a lot to offer and a cons...
HC
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Using the Hardy Weinberg principle, calculate the frequency of the heterozygous genotype in the population if the frequency of the dominant allele p is 0.864. Express your answer as a percentage of the population.

p 2 + 2pq + q 2 = 1.0 p + q = 1.0 1.0 - p = q 1.0 - 0.864 = 0.136 q = 0.136 Frequency of heterozygous genotype = 2pq 2 x 0.864 x 0.136 = 0.235 As a percentage of the population- 23.5%
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Answered by Helen C. • Biology tutor
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Explain the difference between spatial and temporal summation at a synapse.

-Spatial summation occurs when multiple presynaptic neurones together release enough neurotransmitter (e.g. acetylcholine) to exceed the threshold of the postsynaptic neurone. For example, neurone A and neur...
HC
Answered by Helen C. • Biology tutor
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