A100 n box sits on a 30 degree incline. the magnitude of the normal force acting on it is: a. none of these
b. 87 n
c. 100 n
d. 50 n

b. 87N

Explanation:

Start by looking at the picture I attached you. As you can see in the diagram of the left, the weight=mg has one component in the x-axis and another in the y-axis. The normal force is directly over the y-axis, so we dont have to worry about the forces on the x-axis. Now, take a look at the diagram of the right, using it, we will be able to find the weight over the y-axis with trigonometry identities:

Now applying  newton's second law:

There is no acceleration in this case, so a=0

Solving for N:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

explanation:

the masses of the objects and the distance between them