105/35 = 3 of them.
There are 24 hours IN a day. If you're asking how many hours there are DURING DAY TIME, it depends on where one lives. Countries like Singapore and Malaysia experience 12 hours during the day and 12 hours during the night. This depends on its location geographically.
To determine how much of the 745 g sample of Potassium-42 will remain after 74.4 hours, we first calculate the number of half-lives that have passed. Since the half-life is 12.4 hours, we divide 74.4 hours by 12.4 hours, which gives us 6 half-lives. After each half-life, the amount remaining is halved, so after 6 half-lives, the remaining mass is ( 745 , \text{g} \times \left(\frac{1}{2}\right)^6 = 745 , \text{g} \times \frac{1}{64} \approx 11.64 , \text{g} ).
39
The half-life of Cu-61 is approximately 3 hours, meaning that after each half-life, half of the remaining sample decays. After 9 hours, which is three half-lives (3 hours x 3 = 9 hours), the original 2 mg sample would have gone through three decay cycles. Thus, the amount remaining would be (2 , \text{mg} \times \left(\frac{1}{2}\right)^3 = 2 , \text{mg} \times \frac{1}{8} = 0.25 , \text{mg}).
Cats have 9 lives
The duration of Desperate Lives is 1.6 hours.
The duration of Our Happy Lives is 2.45 hours.
The duration of The Lives of Others is 2.28 hours.
The duration of Where Danger Lives is 1.37 hours.
The duration of Strangled Lives is 1.8 hours.
The duration of Where the Spirit Lives is 1.6 hours.
The duration of They Staked Their Lives is 1.35 hours.
The duration of Infinite Lives is 1.55 hours.
The duration of The Time of Their Lives is 1.37 hours.
The duration of Fletch Lives is 1.58 hours.
The duration of Damaged Lives is 1.02 hours.
The duration of The Secret Lives of Dentists is 1.73 hours.