Top answers

How do waterfalls form?

Waterfalls form where a river is flowing over hard rock lying on soft rock. The soft rock is eroded faster, so there is a step in the river which deepens over time. It is eroded by hydraulic action and abras...
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Answered by Dakota R. • Geography tutor
4136 Views

How much force is needed to bring a car to a halt over 5 seconds - the car is moving with velocity km/hr and with a mass of 1000kg.

Explain the concept of momentum mathematically, then draw on physical intuition to reaffirm/deepen their understandingDiscuss how there exists a relationship between the rate of change of momentum and forceU...
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Answered by Harrison L. • Physics tutor
2520 Views

How do you translate the graph y = x^2, five unit squares negatively horizontally and 3 unit squares positively vertically?

Start again by drawing the graph and then the translated graphExplain what is meant by a translation ( a movement of the graph )Use a table of values to show how we can change the function to allow for diffe...
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Answered by Harrison L. • Maths tutor
3706 Views

How does the structure of the heart relate to its function?

The easiest way to understand the way that the heart works is to imagine a double pump with high pressure and low pressure tubing. One part of the pump is low pressure all the way, and that brings the blood ...
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Answered by Mark G. • Biology tutor
5327 Views

If you have 20.82g of Lithium (Molar mass = 6.34gmol^-1), how many moles of Li is it?

number of moles = mass / molar massTherefore, n=20.82g/6.34gmol -1 =3moles
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Answered by Sam H. • Chemistry tutor
3365 Views