Answer: C
Explanation:
Chemical formula of any element, chemical or compound contains the symbol of the elements involved, the number of molecules and the number of atoms present as a subscript.
For instance, Nacl is a chemical formula for sodium chloride. The chemical combination of sodium and chlorine. While Hcl is a chemical formula for hydrochloric acid - the chemical combination of hydrogen and chlorine.
According to the question given above,
The symbol of each element in the substance is one of the part of the chemical formula.
Answer:
Explanation:
Given:
- distance between the student and the mirror,
- height of the eyes from the ground,
- height of the torch above the ground,
Refer the schematic for the clarity of the situation and geometrical interpretation.
<u>Distance between the eyes and the torch:</u>
Now, as we know the law of reflection that angle of incident is equal to the angle of reflection:
We take the triangle NBT:
<u>Now the angle </u><u>r:</u>
The angular momentum of an object moving by uniform circular motion is given by:
where
L is the angular momentum
m is the mass of the object
v its velocity
r the radius of the circular orbit.
In our problem, m=2 kg, v=3 m/s and r=4 m, so the angular momentum of the object is
Answer:
30kg-m/s
Explanation:
momentum = mass x velocity