Milton is conducting an experiment to see how far a marble will
roll when he releases it at the top of an inclined plane. Why
does the marble speed up as it travels down the inclined
plane?
a
The marble has a greater mass as it travels faster.
The force of friction is reduced because the
marbles surface is smooth.
The force of gravity pulls the marble down the
inclined plane.
The marble has less magnetic attraction to the
inclined plane as it travels.

The correct answer is C. the force of gravity pulls the marble down the inclined plane.

Explanation:

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3