An old bone sample contains 321 g of carbon and has an activity of 947 decays/min due to the carbon-14 in it. The half-life of carbon-14 is 5730 y. Assume that the activity of the atmospheric carbon is, and has remained, 0.255 Bq per gram of carbon
(a) How old is the sample?
(b) What will be the activity of the sample 2000 y from now, in decays per minute?
(a) 13,600 y (b) 743 decays/min
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An ideal transformer is one that:
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A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2 . What is the moment of inertia (of the wheel) about the
given axle? a. 0.023 kg/m2 b. 0.013 kg/m2 c. 0.020 kg/m2 d. 0.016 kg/m2 e. 0.035 kg/m2
A hologram like the one shown here cannot be fully appreciated from pictures shown in a book. Why is this?
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