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1. Cobalt-60 is often used as a radioactive source in medical physics. It has a half-life of 5.25 years. Calculate how long after a new sample is delivered the activity will have to decreased to one-eighth of its value when delivered. 2. The half-life of a radioactive isotope of sodium used in...
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Two perpendicular forces, one of 45N directed north and the second of 60N, directed to the west , act simultaneously on an object with a mass of 35 kg. What is the resultant acceleration of the object?
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Two students are on a balcony 23.4 m above the street. One student throws a ball, b1, vertically downward at 15.5 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) What is the...
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The typical airborne speed of an intercontinental B747 jet is 530 miles per hour, while the airborne speed of the supersonic Concorde is 1500 miles per hour. If each airliner were to circumnavigate the Earth (25,000miles), what would be the difference in air time spent by the two aircraft? View more questions Search
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