An air sample is contaminated with 15O, which has a half-life of 2.03 min
One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere. If the oxygen moves at a speed of 1.1 m/s in the pipe, how long must the pipe be for the sample to have decayed to 3.0% of its original activity just as it leaves the pipe?
A) 8.0 m B) 680 m C) 7.0 m D) 2.0 m
B
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Determine the energy stored in the 60-?F capacitor.
A. 2.4 mJ B. 3.0 mJ C. 3.6 mJ D. 4.3 mJ E. 6.0 mJ
What is the least count of your hand calibrated thermometer?
Applications to Astronomy: Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A. the same. B. twice as much. C. half as much. D. four times as much. E. one-fourth as much.
Projectile Motion: A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air resistance, at what angle above the horizontal did it leave the ground?
Fill in the blank(s) with the appropriate word(s).