NEED ANSWERED ASAP 1.find the volume of a cone with height of 12 inches and a base diameter of 6 in. use 3.14 for pie and do not
round
2. A company makes cones out of solid foam each cone has a height of 15 in and a base has a diameter of 3 in how much foam is needed to make 160 cones . use 3.14 for pie and do not round
2. A company makes cones out of solid foam each cone has a height of 15 in and a base has a diameter of 3 in how much foam is needed to make 160 cones . use 3.14 for pie and do not round
1 answer:
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Answer:
The mass of the radioactive sample after 40 minutes is 12.8 g.
Step-by-step explanation:
The mass of the sample can be found by using the exponential decay equation:
Where:
N(t): is the amount of the sample at time t =?
N₀: is the initial quantity of the sample = 120 g
t = 40 min
λ: is the decay constant = 0.056 min⁻¹
Hence, the mass of the sample after 40 min is:
Therefore, the mass of the radioactive sample after 40 minutes is 12.8 g.
I hope it helps you!