Tony pulls a luggage cart at an angle of 30 degrees to the horizontal. The luggage cart has a mass of 35 kg, and he pulls with a force of 75 N. a) What is the normal force on the luggage cart?
b) What for e would Tony need to apply at a 30 degree angle to pull the luggage cart completely off the ground?
c) How does your answer in part (b) change as the angle increases?

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

the answer is the last option

explanation:

because in order to know what the molecule is you need to know how many atoms of each element are in the molecule.