1. The problem statement, all variables and given/known data For a object of mass m, Heisenberg’s uncertainty principle relates the uncertainty in the object’s position Δx to the uncertainty in the object’s speed Δv: (Δx)(Δv) ≥ (h divided by (4)(pi)(m)) where h is Planck’s constant. Calculate the minimum uncertainty in the speed of a tennis ball of mass 0.058 kg, assuming that the uncertainty in its position is approximately equal to its own diameter of 6.5 cm. If you assume the tennis ball has a speed equal to the uncertainty value you calculated, how long would it take for the ball to travel a distance equal to its own size? Based on this, do you feel we can ever say where a tennis ball is with a reasonable uncertainty? Repeat all of the above analysis for a hydrogen atom of mass 1.67 × 10−27 kg with diameter 1.06 angstrom. 2. Relevant equations h = 6.62606896× 10e-34 J·s 3. The attempt at a solution First I plug in the numbers to figure out velocity v: (6.5cm)(Δv) ≥ (6.62606896× 10e-34 J·s divided by (4)(pi)(0.058kg)) (6.5cm)(Δv) ≥ (about) 9 Using basic algebra: (Δv) ≥ 9/6.5 (Δv) ≥ 1.4 So then I plug 1.4 into (Δv)? What do I solve for? I'm not sure where to go from here.