All black surfaces is the correct answer
The word "Everything" belongs in the blank space.
Answer:
D)
Explanation:
Let m be the mass of object .
Angle =
We have to find the coefficient of static friction between the object and the plane.
Normal ,N=
Force, F=f(Friction force)

Substitute the values




Where
Coefficient of static friction
Hence option D is true.
“All chemical reactions involve changes in energy. This may be a change in heat, electricity, light, or other forms of energy. Reactions that absorb energy are endothermic. Reactions that release energy are exothermic.”