<span>9\10 / 6\25
first flip the second fraction so you cross multiply
</span>9\10 x 25/6
now you just multiply across
9 x 25 = 225
10 x 6 = 60
now it's 225/60
you can simplify it so its 15/4 as improper fraction or 3 3/4 as proper fraction
Answer:
ΔT = ΔT0 e^-K T
As I understand Newton's Law of Cooling
ΔT at any time is the difference between the temperature and the surroundings
Originally ΔT0 = 95 - 22 difference between 95 and room temperature
65 - 22 = 33 = 73 e^-KT where t is time to cool to 65 deg
ln (33/73) = -KT K = .794 / 5 = .159 where 5 is time to cool to 65 deg
40 - 22 = 73 e^-.159 T where t is time to cool to 40 deg
18 = 73 e^-.159 T
ln (18 / 73) = -.159 T
T = 8.8 min
It would take 8.8 min for the object to cool to 40 deg C
Suppose the object cooled from 95 to 90 deg, then
ln 68 / 73 = -.159 T and T = .45 min
You can’t really show work for this problem, but the answer is A. This is because physics is about motion, energy, force and stuff and when you get in to a wreck, there are forces and stuff lol
