C. This is the idea of "black body radiation". Charcoal/carbon is a "perfect black body". Absorbs all radiation. There's a whole host of stuff about this in physics, including, I think, Planck's (Nobel Prize winner) black body radiation theory.
Answer:
a black T-shirt would be hotter
Explanation:
dark colors absorb heat. light colors reflect it.
Answer:
The speed on boat in still water is 
and the rate of the current is 
Explanation:
Since speed , 
Therefore speed of motor boat while traveling upstream is
and speed of motor boat while traveling downstream is
Let speed of boat in still water be 
and rate of current be 
Therefore 
----(A)
and 
------(B)
Adding equation (A) and (B) we get
=>
------(C)
Substituting the value of in equation (A) we get
Thus the speed on boat in still water is and the rate of the current is
Answer:
2 m/s²
Explanation:
Given:
v₀ = 0 m/s
v = 20 m/s
t = 10 s
Find: a
a = (v − v₀) / t
a = (20 m/s − 0 m/s) / 10 s
a = 2 m/s²
the problems that harnessing wind for energy is the expense of large tracts of land in populated areas.
hope this helps you
