Search our library of A Level questions

Top answers

All subjects

A Level

A 1kg ball is dropped of a 20m tall bridge onto tarmac. The ball experiences 2N of drag throughout its motion. The ground has a coefficient of restitution of 0.5. What is the maximum height the ball will reach after one bounce

Energy
GPE of the ball on the bridge: MGH = 1 * 9.81 * 20 =196 J
energy lost to drag = F * D = 2 * 20 = 40 J
Velocity of the ball just before impact =sqr(2*(196-40)/1) =17.66 m/s

Answered by Max D. • Further Mathematics tutor

2370 Views

In ecology, what does the phrase 'carrying capacity' refer to and what factors may determine it?

Carry capacity refers to the maximum population size a species can reach in a particular environment.Important factors in determining carry capacity (among others):Food availabilityPredator population siz...

Answered by Jacob G. • Biology tutor

3289 Views

How should I structure the coursework essay I have been set?

The easiest way to structure your coursework essay is through a rigid plan that you religiously stick to. Before you go to write the essay create an essay plan that runs through your argument by thematica...

Answered by Daniel D. • History tutor

3076 Views

A circuit with a voltage source of 18V, has 3 resistors all connected on parallel, values at 2ohms, 6ohms and 7.5ohms. Find the total circuit resistance, and then subsequently, the total current supplied and power dissipated in the curcuit.

The total resistance is found by the addition of resistors in parallel, in the equation (1/R_T)=(1/R₁)+(1/R₂)+(1/R₃), therefore the total resistance is 1.25ohms....

Answered by Harrison M. • Physics tutor

1854 Views

30% of a population lacks the ability to taste the chemical PTC. Non-tasters are homozygouse recessive for this tasting gene. What percentage of the population are tasters and what percentage of the population are NOT heterozygous for this trait?

This question requires the knowledge of two equations from the Hardy-Weinberg Principle. p + q = 1 and p²+ 2pq + q² = 1 where p = dominant allele, and q = recessive allele. Firstly ...

Answered by Fergal H. • Biology tutor

5578 Views