220pm=10w (people*minutes)
w=22pm
14w=308pm
308pm/14p=22m
So it would take 22 minutes for 14 people to paint 14 walls.
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
Z=180º-(62º+95º)
Z=180º-157º
z=23º
Answer:
Multiply 1240 by 1.15 to get 1426 students enrolled this year.
:
Apologies for the bad handwriting.
