A dentist uses a small mirror of radius 55 mm to locate a, Ask an Expert

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Q. A dentist uses a small mirror of radius 55 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 20 mm from the tooth, what is the magnification of the image?

Q. An 8.4 kg stone at rest on a spring. The spring is compressed 11 cm by the stone. The stone is then pushed down an additional 33 cm and released. To what maximum height (in cm) does the stone rise from that position?

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