To hoist himself into a tree, a 72.0-kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. he then pulls downward on the free end of the rope with a force of 358 n. neglect any friction between the rope and the branch, and determine the man’s upward acceleration.

acceleration a= 0.1344 m/sec^2

Explanation:

Given

mass of the object m= 72 kg

Force applied with help of rope= 358 N

Acceleration due to gravity= 9.81 m/sec^2

Since there is no force acting on the person and rope

then  T=F

and from the FBD we can write

2T- mg= ma ,or

2F- mg= ma

now putting the values we get

on calculating we get acceleration a= 0.1344 m/sec^2

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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