Achair of weight 95.0n lies atop a horizontal floor; the floor is not frictionless. you push on the chair with a force of f = 39.0n directed at an angle of 37.0 degrees below the horizontal and the chair slides along the floor.
1)using newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair.

118.47

Explanation:

Given

force (F)= 39 N acting at an angle of 37 below horizontal

Force can be divided in to sin and cos component

Thus Fsin37 will act in Y direction

Total Force in Y direction is Normal reaction , Fsin37 and weight

N-mg-Fsin37=0

N=118.47 N

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia