# Megha Sanjeev

PhD Engineering student teaching physics and maths online

5174Students helped
£15Per hour
Maths

Asked by Omar · 5 years ago

Helen draws a random circle. she then measure it diameter and circumference. should get a circumference, C, of 405mm correct to 3 significant figures she get a diameter, D, of 130mm correct 2 significant figures. Helen want to find the value of Pi using a formula Pi =D/C calculate the lower bound and upper bound for Helen's value of pi give your answer correct to 3 decimal place?

First, you want to find the lower and upper bounds of the circumference C and diameter D. C = 405mm to 3sf so the bounds are: 404.5 to 405.5 We find this by subtracting/adding half the degree of accuracy. Here it is 1mm, looking at 3rd significant figure. D = 130mm to 2sf so the bounds are: 125 to 135 Here the degree of accuracy is 10mm, looking at the 2nd significant figure. Now you conside... more

Science

Asked by Hamza · 5 years ago

Chemistry: My question is how does a greater concentration speed up particles and cause collisions? 2nd question: How does a catalyst impact any results taken?

Simply increasing concentration does not increase the speed of the particles, it increases the rate of reaction. The greater concentration of particles makes collisions more likely. You can think of it as the particles becoming more crowded together so it’s easier for them to ‘bump’ into each other. More overall collisions results in more successful collisions (where there is enough energy for a... more

Maths

Asked by Melina · 3 years ago

A right angled triangle with one side 5.7 cm and the other 6.3 cm what is x (the short side, base)?

Longest side is the hypotenuse so by Pythagoras (6.3)^2 = (5.7)^2 + x^2 Rearranging x = Sqrt((6.3)^2 - (5.7)^2) So x = 2.68 3sf

# Megha Sanjeev

PhD Engineering student teaching physics and maths online

5174Students helped