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Sodium’s atomic number is 11 and its mass number is 23. How many protons, electrons and neutrons does it have?

The mass number defines the number of protons and neutrons in an atom. The atomic number shows the number of protons in an atom (nucleus). Because there is the same number of protons as electrons in an atom ...
CM
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Solve the following set of equations. 3x + 2y = 5, 2x + 3y =6

This question is an example of simultaneous equations. It's very important to show your working on this question otherwise you won't get any marks, even if you get the right answer! All simultaneous question...
EL
Answered by Errol L. • Maths tutor
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A particle of mass 5kg is acted upon by a force of 400N for a distance of 20m along the x axis. What is its final velocity if it is initally at rest?

The work done by a force on a particle is: Work done = Force x Displacement.The energy of a particle is given by the sum of its potential and kinetic energies.As the particle does not gain or lose any height...
LT
Answered by Luke T. • Physics tutor
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After a trip to Spain you decided to write a travel article for your school magazine. What advice would you give to anyone who wants to go to Spain for a weekend break?

Primero, necesitas pensar en lo que quieres llevar en tu maleta. Yo diría que valga la pena mirar la previsión del tiempo. ¿Qué tiempo hace en la ciudad que visitas? ¿Hace calor o frío? Con esta decisión pue...
GG
Answered by Giovanna G. • Spanish tutor
2198 Views

Solve the equation (x+2)/(x-3)=(x-6)/(x+1) for x.

We need to multiply both sides by the denominator (the bottom of the fraction) in both fractions so we get:(x+2)(x-3)(x+1)/(x-3)=(x-6)(x-3)(x+1)/(x+1)Now, we can see that we can cancel each fraction to get t...
TH
Answered by Tom H. • Maths tutor
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