Answer to Question #15838 in Mechanics | Relativity for asif rafiq
let a satellite is moving in an orbit given by the equation x2+y2=4.At what rate the position of the satellite y is changing with respect to x.When the satellite is at the point (2^1/2, 2^1/2)
Let's find the dependence of y from x:
x²+y²=4 ==> y(x) = √(4-x²).
Now we can find derivative of y(x) with respect to x:
y'(x) = (1/2)*(4-x²)^(-1/2)*(-2x) = -x(4-x²)^(-1/2).
So, when x is equal to √2 (and so does y)
y'(√2) = -√2(4-(√2)²)^(-1/2) = -√2*2^(-1/2) = -√2*(1/√2) = -1.
Therefore, y is changing with the rate of -1 with respect to x when the satellite is at the point (√2,√2).