math
ramos was falling through the air of 30feet per second. how many feet did ramos fall in the 110 seconds before she opened her parachute?
Math
THANK YOU
Chemistry
IF 80mg of a radioactive element decays to 10mg in 30 minutes, the half-life of this element is a.10 min b.20 min c.30 min d.40 min the answer is a.10 min but i would like to know why, please help.
Chemistry
which of the following 10 g samples will decay the most in 28 days? a.P-32 b.Kr-85 c.Fr-220 I-131 the answer is c.Fr-220 but i want to know why, please help
chemistry
A unknown piece of metal is placed into a container of acid. Hydrogen gas was produced as a result. The unknown metal could have been ? Ti is the answer, but I don't understand why.
chemistry
which of the following 10 g samples will decay the most in 28 days? P-32 Kr-85 Fr-220 I-131
Pre-calculus
Turn "theta = 2" into rectangular form.
Chemistry
K-42 has a half-life of 12.4 hours. If you begin with 250g of K-42, determine how much you will have left after 4 half-lives. How long does 4 half-lives take? please help
chem
radiated food can be safely stored for a longer time because radiation 1. prevents air oxidation 2. prevents air reduction 3. kills bacteria 4. causes bacteria to mutate is it 3 ?
Chemistry
which isotope can be used as a tracer to study the age of organic material ? 1 C-12 2 C-14 3 Tc-99 4 U-238
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