Consider an elevator with a table and a book on top of the table. The mass of the table is 10kg and the mass of the book is 2kg. At t=0 the elevator is moving up with a velocity of 1m/s.
At t=2s the elevator is moving up with a velocity of 8 m/s

Find the Force from the Book to the Table in N. Use the convention where a positive value(+) means upward force and a negative value(-) means downward force.

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.

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