Mathematics B Regents High School Examination Worksheet - The University Of The State Of New York, 2004 Page 13
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24t
H
29 The equation for radioactive decay is p = (0.5) , where p is the part
of a substance with half-life H remaining radioactive after a period of
time, t.
A given substance has a half-life of 6,000 years. After t years, one-fifth of
the original sample remains radioactive. Find t, to the nearest thousand
years.
30 One force of 20 pounds and one force of 15 pounds act on a body at
the same point so that the resultant force is 19 pounds. Find, to the
nearest degree, the angle between the two original forces.
[13]
[OVER]
Math. B – Jan. ’04
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