Top answers

Quand utiliser tu et quand utiliser vous ?

Pour une personne de moins de 18 ans environ, il faut utiliser tu pour quelqu'un de son âge, de 18 ans ou moins, pour sa famille ou ses amis. Vous est reservé à toutes les autres personnes : professeurs, étr...
JZ
Answered by Judith Z. • French tutor
3270 Views

Do batteries contain current, which comes out when they are in a circuit?

No; this is a common misconception! Batteries store energy, which is used to push electrons (charges) around a circuit. The flow of electrons is called current. As the electrons flow through the circuit they...
SS
Answered by Samuel S. • Physics tutor
4203 Views

What is dot product and how to calculate it?

There are two ways of multiplying vectors: one gives you another vector (cross product) and the other gives you a scalar- a number, like 3, 18 or 196 352. Hence, dot product is also called the scalar product...
FW
Answered by Filip W. • Maths tutor
8993 Views

If one proton is travelling through space at 0.3c, what is it's kinetic energy in MeV?

We know the formula for kinetic energy is KE = (1/2)mv 2 . If we know that c, the speed of light, is 3x10 8 ms -1 (you will be given this value in your Data & Formula books in the exam) and the proton is...
OB
Answered by Oisin B. • Physics tutor
7328 Views

Prove that the d(tan(x))/dx is equal to sec^2(x).

You can express tan(x) as sin(x)/cos(x). Therefore, tan(x)= sin(x)/ cos(x)The quotient rule can be applied here as there is a function of x in the numerator and denominator.Quotient Rule: (v*(du/dx) - u*(dv/...
CU
Answered by Chinazam U. • Maths tutor
19807 Views