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A square, with sides of length x cm, is inside a circle. Each vertex of the square is on the circumference of the circle. The area of the circle is 49 cm^2. Work out the value of x. Give your answer correct to 3 significant figures.

The question tells us that the area of the circle is 49cm 2 , therefore we are able to form the equation πr 2 =49 (where r = radius of the circle). We can now work out the radius of the circle by rearranging...
SJ
Answered by Sian J. • Maths tutor
24062 Views

Describe how a sample of copper chloride crystals could be made from copper carbonate and dilute hydrochloric acid.

To make crystals of copper chloride from copper carbonate andd dilute HCl, you will firstly need to add an excess of copper carbonate to the dilute HCl (keep adding until no more reacts). Next, take the solu...
SJ
Answered by Sian J. • Chemistry tutor
31820 Views

Calculate the amount of moles in 36 grams of carbon

We need to use the equation : Moles=Mass/MrSubstitute in value : moles= 36/12Therefore number of moles in 36 grams of carbon is 3.
RK
Answered by Ramisha K. • Chemistry tutor
17055 Views

What is homeostasis and give an example

Homeostasis is the physiological process of maintaining a condition such as temperature or chemicals in a normal range despite changes that occur everyday in the body. Usually, this is regulated by hormones ...
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Answered by Carolina B. • Biology tutor
3694 Views

Describe how water moves from the roots to the leaves in plants

water moves via the transportation stream, pulling it up through the xylem in the stem of the plant
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Answered by Caitlin X. • Biology tutor
3363 Views