Acar is travelling north at a constant speed of 20 m/s. a force is applied directly east on the car. the motion of the car will be change in which of these ways? a) the speed of the car will increase. b) the speed of the car will decrease. c) the speed will increase, and the car will change the direction it is moving. d) the speed will remain the same, but the car will change the direction it is moving.

C) The speed will increase, and the car will change the direction it is moving.

Explanation:

The car is travelling north at constant speed.  The force applied to the car is in the east direction, so it won't affect the speed in the north direction, but it will increase the speed in the east direction.  Therefore, the net speed increases, and the car changes direction.

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