18. A high-power laser with 1.0 mm beam diameter is used to cut through metals. The laser generates peak cut at 0.70 MV/m at the target. What is the power delivered by the laser? (A) 0.5 W (B) 1.0 kW (C) 2.0 kW (D) 4.1 kW (E) 2.0 MW

1. wo balls enter two frictionless tracks at the same time with the same velocity from the left end. Under the influence of gravity, which ball will arrive at the right end first (A) Ball A. (B) Ball B. (C) Two balls will have the same speed. (D) Uncertain; the answer depends on the height of the slides. (E) Uncertain; the answer depends on the curvature of the right slide.

18. A high-power laser with 1.0 mm beam diameter is used to cut through metals. The laser generates peak cut at 0.70 MV/m at the target. What is the power delivered by the laser?
(A) 0.5 W
(B) 1.0 kW
(C) 2.0 kW
(D) 4.1 kW
(E) 2.0 MW

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