Final answer:
When measuring the mass of a granite rock, Sara should write the number shown on the balance, followed by the unit grams (g). The correct unit to use when measuring mass is grams (g), as it is the standard unit for mass in the metric system.
Step-by-step explanation:
When measuring the mass of a granite rock, Sara should write the number shown on the balance, followed by the unit grams (g).
For example, if the balance shows a mass of 100 grams, Sara would write it as 100g.
When measuring the mass of an object, such as a granite rock, the correct unit to use is grams. Mass refers to the amount of matter in an object and is distinct from volume or distance, which are measured in different units.
Let's go over the units listed in the options to understand why grams is the correct choice: a. cm^3 (cubic centimeters) is a unit of volume, not mass. It's used to measure the space an object occupies. b. g (grams) is the unit of mass in the metric system.
It's the appropriate unit for measuring the amount of matter in the granite rock. c. ml (milliliters) is a unit of volume, typically for liquids. It's not the correct unit for measuring mass. d. cm (centimeters) is a unit of length used to measure distance or size, not mass.
Based on this information, the correct unit that Sara should use when writing the number shown on the balance to indicate the mass of the granite rock is grams (g). Therefore, the answer is option b. g.
The correct unit to use when measuring mass is grams (g), as it is the standard unit for mass in the metric system.