Aball is attached to the end of a string. a child holds the other end of the string and twirls it so the ball travels in a circular path. then the child suddenly releases the string. in which direction will the ball move initially?

tangent to the circle

along the circumference of the circle

directly toward the child

directly away from the child

First option

Explanation:

If the ball is running in a circular motion then its velocity v will be tangency to the circular path.

 In this problem the centripetal force that allows the circular movement is the tension T of the rope to which the ball is tied, if the child releases the rope then this tension becomes equal to zero and the circular movement is interrupted.

 As the speed v of the ball is always tangential to the circumference at any point of the same, then at the instant in which the rope is released, the ball will follow the same trajectory that it had at that moment, that is, tangential to the circumference.

Observe the attached image.

Therefore the answe is: tangent to the circle

the independent variable, or the one that is intentionally manipulated is the speed.

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