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You've dropped your car keys at night off the end of a dock into water 1.6 m deep. A flashlight held directly above the dock edge and 0.50 m above the water illuminates the keys when it’s aimed at 40° to the vertical, as shown in Fig. 30.21. What’s the horizontal distance x from the edge of the dock to the keys?
37. Laser eye surgery uses ultraviolet light with wavelength 193 nm. What’s the UV light’s wavelength
FIGURE 30.21 Problem 36
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