[填空题]
Assume there are $5.0 \times 10^{13}$ protons at 1.0 TeV stored in the 1.0-km-radius ring of the Tevatron.
(a) How much current (amperes) is carried by this beam?I = A
(b) How fast would a 1500-kg car have to move to carry the same kinetic energy as this beam? v $\approx $ $ \times 10^2\ \text{m/s}$
