The height x metres, of a column of water in a fountain display satisfies the differential equation dx/dt = 8sin(2t)/(3sqrt(x)), where t is the time in seconds after the display begins. (a) Solve the differential equation, given that x(0)=0

Our DE (Differential Equation) dx/dt = 8sin(2t)/(3sqrt(x)) is separable because dx/dt can be expressed as a product of two functions of the form dx/dt = f(t)g(x) = (8sin(2t)) * (1/(3sqrt(x))).To solve the DE, we first divide both sides of our equation by our function using the x variable: 3sqrt(x) * dx/dt = 8sin(2t), we can now integrate both sides with respect to x | 3sqrt(x) *dx/dt * dt = | 8sin(2t)dt, pull out the constants 3| sqrt(x)dx = 8| sin(2t)dt, integrate both sides, without forgetting the constant of integration C, 3 * ((2/3) * x^(3/2)) = 8 * ((1/2) * -cos(2t)) + C, simplify the expression2x^(3/2) = -4cos(2t) + C, x^(3/2) = -2cos(2t) + C/2, x = (-2cos(2t) + C/2)^(2/3). Now to find the value of C/2, we plug in our initial condition x(0)=0, 0 = (-2cos(0) +C/2)^(2/3), C/2 = 2. So finally, x = (2-2cos(2t))^(2/3).

Answered by James M. Maths tutor

5756 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

What is the derivative of x^x


A function is defined by f(x)=x/(2x-2)^(1/2): (a)Determine the maximum domain of f. (b)Differentiate f. (c)Find the inflection points of the function's graph.


Integrate (x)(e^x) with respect to x and then integrate (x)(e^x) with respect to y.


Evaluate f'(1) for the function f(x) = (x^2 + 2)^5


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences