A 330 kg piano slides down a 37 degree frictionless incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Calculate (a) the force exerted by the man. (b) the work done by the man on the piano. (c) the work done by the force of gravity. And (d) the net work done on the piano. (Please show your work)

what is the question because that is not a question.

no sign of dia of fuel cell

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