Lilajom1ich8oa
Lilajom1ich8oa Lilajom1ich8oa
  • 13-07-2016
  • Physics
contestada

A 6.5-cm-diameter tennis ball has a terminal speed of 28m/s. What is the ball's mass?

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taskmasters
taskmasters taskmasters
  • 19-07-2016
Terminal speed is the speed wherein an object falling will reach a constant velocity. At this point, Fg is equal to Fd. (Drag coefficient for a sphere is 0.47 and density for this object was said to be 1.25kg/m^3)

F_g = m x g 
F_d = 1/2 x Cd x rho x A x v^2 

1/2 x Cd x rho x A x v^2 = m x g 

m = 1/2 x Cd x rho x A x v^2 / g
m = 1/2 x 0.47 x 1.25 x (.065^2/4) x pi x 28^2 / 9.81
m = 0.0779 kg
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