Bill and Mary wanted to have a snack after school. They heated some milk in a pot on the stove to make hot chocolate. They also
1 answer:
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Explanation:
Make a table, listing the x and y coordinates of each square's center of gravity and its mass. Multiply the coordinates by the mass, add the results for each x and y, then divide by the total mass.
The x-coordinate of the center of gravity is 15/14 a.
The y-coordinate of the center of gravity is 47/42 a.
Answer:
The count rate at the end of four days will be 7.5 counts per minute.
Explanation:
First it is important to know that half-life is the time to a piece of radioactive material to decay 50%. So if we know we start with 120 counts per minute and we already know the half-life of the isotope is 1 hour we expect that past 1 hour the material decays 50% (it's halved) so we will count 60 counts per minute, now if we wait another hour 60 counts will decay in to 30 counts per minute and so on. That should be translate to a math equation as:
<em>final counts = initial counts * </em>
After 4 days we have 4 half-life periods passed so:
<em>final counts= 120 counts per minute *</em>
<em>final material = 7.5 counts per minute</em>