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Two cables hold a mass of 100kg, joining in the middle of the top of the mass. Two helicopters lift a cable each and hover so that the height of the mass is constant. Each cable makes an angle of 57° with the normal. Find the tension in each cable.

Once you note that the height is constant, the key thing to remember here is that there is no unbalanced force acting on the mass. By this, I mean that since the mass is not accelerating (it is actually at r...
JK
Answered by Joseph K. • Physics tutor
2995 Views

"I always feel that I am arguing the same point. How can I make my essays stand out more?"

My recommendation would be to broaden your net. Do not restrict yourself to the traditional readings of "Shakespeare" or "Jane Austen". There are hundreds of academic essays written on th...
JB
3265 Views

The equation " x^3-3x+1=0 " has three real roots. Show that one of the roots lies between −2 and −1

A simple way to prove this is to sub in the values that we are given. so f(x) will represent our equation x^3-3x+1 (that is f(x) = x^3-3x+1)f(-2) = -1 < 0f(-1) = 3 > 0The first thing we notice is that ...
JB
Answered by James B. • Maths tutor
10785 Views

Solve x^2 + x=12 by factorising

Start off with:x 2 +x=12Subtract 12 from both sides:x 2 +x-12=0Factorise:(x-3)(x+4)=0Solution is therefore:x=3 or x=-4
DB
Answered by Duwan B. • Maths tutor
4057 Views

Why does ionisation energy increase across a period?

As you go across the period, the nuclear charge (or number of protons increase) but the shielding (or the number of shells) stays the same as all of the elements are on the same period. This causes the nucle...
AP
Answered by Anjali P. • Chemistry tutor
2731 Views