A 1.50 kg block rests on the icy surface of a frozen pond, which you can suppose to be friction less. If the location of the block is measured to a precision of0.20 cm, what is the minimum certainty in the block's speed, assuming the mass is known exactly?
The average lifetime of a W boson is about 3.0*10-25 s. Estimation the minimum uncertainty in the energy of a W boson.