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There is an increasing worry about the rise of antibiotic-resistant bacteria, such as MRSA. How can doctors ensure that this threat is minimised? (2 marks)

Doctors can ensure that there is a reduced number of antiobiotics prescribed for patients. They can also make sure that patients are fully evaluated so as to stop the prescription of antibiotics for viral in...
AT
Answered by Alex T. • Biology tutor
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If a 60kg girl jumps out of a helicoptor, draw diagrams to show the forces (with values) acting on her when a) she is in freefall, b) she is accelerating at half of g (g = 10 m/s^2), c) she is travelling at a constant speed?

a) 600N arrow down for weight, no air resistance arrow, acceleration = 10m/s^2 b) 600N arrow down, 300N arrow up for air resistance, acceleration = 5m/s^2 (Using F = ma) c) 600N arrows up and down (forces ba...
EJ
Answered by Ella J. • Physics tutor
2741 Views

What makes a good essay introduction?

A strong introduction is vital for any good essay, as it lends structure to both the reader but also yourself. In order to write a convincing essay you need to outline your points clearly and briefly in the ...
CS
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What is Cracking and why is it carried out?

Cracking is the process of breaking large Hydrocarbon molecules into smaller ones. This is carried out to refine fuels and increase the yeild in petrolium refining.
AG
Answered by Anna G. • Chemistry tutor
12781 Views

If an element has an atomic mass of 19 and a proton number of 9, how many neutrons does it have and how many electrons does it have?

The atomic mass is made up of all the protons and neutrons (which together form the nucleus) which each have a mass of approx. 1g. Therefore if the mass of the element is 19g and it has 9 protons (proton num...
JT
Answered by Jay T. • Chemistry tutor
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