Answer:
B. the object reflects blue light more than it does any other color.
Explanation:
The color of an object as we see it corresponds to the wavelength of the light that the object reflects.
Let's consider an object on which white light is shone, as in this problem. If the object absorbs all the possible wavelengths of visible light, the object will not reflect any colour, so it will appear black. However, if the object reflects at least one color, the light of that color (reflected by the object) will reach us, so we will see the object in that color.
Therefore, in this problem, the object appears blue because it reflects blue light more than the other colors.
To determine the answer to this item, we use two (2) equations.
Equation for kinetic energy:
KE = 0.5 mv²
Equation for momentum:
P = mv
From the second equation, we can deduced that,
m = P/v
Substituting the known values from the given above,
m = 30/v
Using this expression in the first equation,
KE = 0.5 mv²; 150 = 0.5(30/v)(v²)
The value of v from the equation is 10 m/s.
The mass is therefore calculated as such,
m = 30/v = 30/10 = 3 kg
Hence, the answers are,
<em> Mass = 3 kg</em>
<em> Velocity = 10 m/s</em>
<u>Answer:</u> The mass of sulfur hexafluoride is 146 u.
<u>Explanation:</u>
Mass of a mole of a substance is defined as the molar mass of that substance.
It is defined as the sum of every component each multiplied by the times they appear in that substance.
We are given:
Mass of sulfur atom = 32.0 u
Mass of fluorine atom = 19.0 u
The chemical formula for sulfur hexafluoride is 
So, the molar mass of 
Hence, the mass of sulfur hexafluoride is 146 u.