Top answers

Why do gravitational fields around point masses obey an inverse square law?

We can approach this question using the idea of flux lines. First we consider a sphere with a constant density of flux lines at its surface, as is the case for a point mass. These flux lines all point radial...
JC
Answered by James C. • Physics tutor
1992 Views

Solve the simultaneous equation, 3x + y = 8 and x + 3y = 12, to find a value for x and y.

Re arrange one of the equation to get a single variant answer. So, x = 12 - 3y. Substitute this into the other equation, so 3 (12-3y) + y = 8. Expand this equation to form 36 - 9y + y = 8. Collect the y term...
GR
Answered by Grace R. • Maths tutor
7031 Views

What topic should I talk about in my oral?

Your oral presentation will only last two minutes but it is important to consider the longer general conversation you will have after this. When considering options for your oral presentation, it is importan...
PJ
Answered by Phoebe J. • Spanish tutor
2370 Views

Show that (x + 4)(x + 5)(x + 6) can be written in the form ax3 + bx2 + cx + d where a, b, c and d are positive integers.

=(x+4)(x 2 +6x+5x+30)=(x+4)(x 2 +11x+30)=x 3 +11x 2 +30x+4x 2 +44x+120=x 3 +15x 2 +74x+120
JZ
Answered by Jiawen Z. • Maths tutor
3177 Views

What are moles and how do you calculate them?

Well this depends whether you require the moles of gas, solid or solution as to which equation you use, moles relate the mass of the atom of interest to that of the number of atoms in 12 grams of carbon-12. ...
BT
2304 Views