Top answers

How many times further away from the pivot point of a seesaw does someone of double the weight have to sit in order for the it to balance?

Sum of moments in equilibrium must equal 0. The sum of clockwise moments must equal the sum of anticlockwise moments. W1 is the force exerted on the seesaw by the heavy person at distance D1 from the pivot a...
RM
Answered by River M. • Physics tutor
3414 Views

By considering Newton's second law and his law of gravitation, derive an expression for gravitational field strength g in terms of its mass, m, the distance from its center of mass, r, and the gravitational constant, G.

Newton's second law of motion is F = ma and his law of gravitation is F= GMm/r^2.g is the acceleration of free fall and can be substituted for a, F = mg.We can therefore see that g = F/m and can use that to ...
RM
Answered by River M. • Physics tutor
2439 Views

How can I factorise 2(x^2)+3x+1=0 ?

This quadratic equation is in the form ax^2+bx+c=0 (a=2, b=3, c=1), where there is a coefficient in front of X 2 term. First we have to multiply a and c. we then have to find two numbers z and y which multip...
JR
Answered by Jonathan R. • Maths tutor
3336 Views

How do I write the full equation of a cell from two half cells? (basic, with matching electron counts and no water/acid)

Lets use an example:Fe 3+ (aq) + e - <==> Fe 2+ (aq) E 0 = +0.771 VLi + (aq) + e - <==> Li(s) E 0 = -3.040 V Step 1: Work out which half equation has the most positive standard electrode potentia...
FP
Answered by Fred P. • Chemistry tutor
2617 Views

Find the general solution to: d^(2)x/dt^(2) + 7 dx/dt + 12x = 2e^(-t)

"General Solution = Complimentary Function + Particular Integral"AE: m 2 + 7m + 12 = 0 solve for m (m+3)=0m = -4 or -3Hence the Complimentary Function = Ae -4t + Be -3t PI: [substitute u=ke -t ]u'=...
EO
4098 Views