The pressure rise, δp, across a pump can be expressed as δp = f(d, rho, ω, q), where d is the impeller diameter, rho the fluid density, ω the rotational speed, and q the flowrate. determine a suitable set of dimensionless parameters.

If football was tossed in air without gravity or friction the ball would go into space

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It equals just about 6,300 km per hour each day an week

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward