Answer:
Step-by-step explanation:
A=2(wl+hl+hw)=2·(2·6+24·6+24·2)= 408cm²
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
I did this two years ago. Hope I can help you.
Answer:
22 1/4 or 22.25
Step-by-step explanation:
4x + 7 = 92
4x = 85
x = 22 1/4
Answer:
she swam 1500 meters in 1/4 of the time and he swam 750 in half of his time. Hope this helps
