Which statement best describes why a machine is useful?
A machine does a greater amount of work than the amount of work that is done on it.
O Amachine does a smaller amount of work than the amount of work that is done on it.
A machine can decrease both the input force and the input distance needed to do a given amount of work.
Amachine can decrease either the input force or the input distance needed to do a given amount of work.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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c)as speed changes, wavelength and frequency change.

everything changes!

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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