4. Diego and Samuel help to clean up a polluted stream. They collect a glass bottle filled with some juice, several wood sticks , and a plastic food container. How do the particles in the juice differ from the particles in the glass, plastic, and wood?
a.) They are locked in place
b.)They can move past one one another
c.)They move freely in all directions
d.)They are locked in place, but can vibrate

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it