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Question relating to human adaptations to cold environments: In a cold environment, humans use shivering as a method of keeping warm. Describe and explain the process of shivering.

DESCRIBE aspect of the question: Shivering describes the involuntary contractions our muscles make when our core temperature starts to drop below 37 degrees Celcius. EXPLANATION: Actin and myosin filaments i...
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Answered by Shoomena A. • Biology tutor
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The complicated questions in algebra are really confusing me and I can't seem to be getting the right answers.

In algebra, like every topic that is covered in GCSE Maths, there is a set method that you should follow and this will always help you to solve the question. The complicated algebra questions are ones that t...
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Answered by Prannay R. • Maths tutor
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Why is the first ionisation energy of Potassium less than Sodium?

The first ionisation energy is the energy required to move one mole of electrons from one mole of atoms in its gaseous state. The outer electron in Potassium is in the 4s orbital, which is further away from ...
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Answered by Abida R. • Chemistry tutor
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Calculate the mass, in grams, of CH3CH2NH2 produced from 32.9 g of CH3CH2I reacting with an excess of NH3 assuming a 70.0% yield.

To tackle any question like this, you should first write out the reaction formula (I would do this on the whiteboard). You can see from this that the ratio between the reactant and product is 1:1. You can al...
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Answered by Rob B. • Chemistry tutor
4738 Views

Electrons are accelerated through a potential difference of 300 V. What is their final de Broglie wavelength?

The kinetic energy of the electron will be equal to the energy what the electric field gives to it.1/2 m v 2 =V QFrom thisv=sqrt(2 V Q/m) De Broglie wavelength:lambda=h/p=h/(mv) We know that h is the planck ...
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Answered by Csaba B. • Physics tutor
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