Answer:
correct answer is objects that are good absorbers of radiation are good reflectors as well
Explanation:
This is a contradiction because good absorbers are poor reflectors. For example if you have a mirror which have shiny surface then it can reflect the radiation in a well manner but it is not a good absorber.
other options are true.
Answer:
d) 1.44m
Explanation:
According to Newton's second law:
analyzing the horizontal components of the force:
applying the second law
given the acceleration we can calculate the distances traveled before stopping:
Ethylene glycol is termed as the primary ingredients in antifreeze.
The ethylene glycol molecular formula is C₂H₆O₂.
Molar mass of C₂H₆O₂ is = (2×12) +(6×1) + (216) = 62g/mol
Now that antifreeze by mass is 50%, then there is 1kg of ethylene glycol which is present in 1kg of water.
ΔTf = Kf×m
ΔTf = depression in the freezing point.
= freezing point of water freezing point of the solution
= O°c - Tf
= -Tf
Kf = depression in freezing constant of water = 1.86°C/m
M is the molarity of the solution.
=(mass/molar mass) mass of solvent in kg
=1000g/62 (g/mol) /1kg
=16.13m
If we plug the value we get
-Tf = 1.86 × 16.13 = 30
Tf = -30°c
