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A steel ball is traveling through water with a speed of 
x meters per second, where 
x is positive. The drag force, 
F, in newtons (N) is:

F=0.5+0.004(x+50)(x-2
At what speed in meters per second does the ball have a force of 
0.5N on it?

A steel ball is traveling through water with a speed of x x meters per second, where x x is positive. The drag force, F F , in newtons (N) (\mathrm{N}) is:\newlineF=0.5+0.004(x+50)(x2 F=0.5+0.004(x+50)(x-2 \newlineAt what speed in meters per second does the ball have a force of 0.5 N 0.5 \mathrm{~N} on it?

Full solution

Q. A steel ball is traveling through water with a speed of x x meters per second, where x x is positive. The drag force, F F , in newtons (N) (\mathrm{N}) is:\newlineF=0.5+0.004(x+50)(x2 F=0.5+0.004(x+50)(x-2 \newlineAt what speed in meters per second does the ball have a force of 0.5 N 0.5 \mathrm{~N} on it?
  1. Given Equation: We are given the drag force equation F=0.5+0.004(x+50)(x2)F = 0.5 + 0.004(x+50)(x-2) and we need to find the value of xx when F=0.5NF = 0.5N. First, we set the force FF to 0.5N0.5N in the equation and solve for xx. 0.5=0.5+0.004(x+50)(x2)0.5 = 0.5 + 0.004(x+50)(x-2)
  2. Set Force to 0.5N0.5\,\text{N}: Subtract 0.50.5 from both sides of the equation to isolate the term with xx. \newline0=0.004(x+50)(x2)0 = 0.004(x+50)(x-2)
  3. Subtract 0.50.5: Divide both sides of the equation by 0.0040.004 to simplify the equation.\newline0=(x+50)(x2)0 = (x+50)(x-2)
  4. Divide by 0.0040.004: Now we have a quadratic equation in the form of (x+50)(x2)=0(x+50)(x-2) = 0. We can find the values of xx by setting each factor equal to zero.\newlinex+50=0x+50 = 0 or x2=0x-2 = 0
  5. Quadratic Equation: Solve for xx in both equations.x=50x = -50 or x=2x = 2
  6. Solve for xx: Since xx represents a speed and speed cannot be negative, we discard the negative value.\newlineTherefore, the speed at which the ball has a force of 0.5N0.5\,\text{N} on it is x=2x = 2 meters per second.

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