Krishne wants to measure the mass and volume of a key. which tools should she use?
a balance and a beaker of water
a balance and a meter stick
a beaker of water and a ruler
a ruler and a meter stick

a balance and a beaker of water

Explanation:

- Mass is an intrinsec property of any physical object, and it represents somehow the "amount of matter" inside the object. It is measured in kilograms (kg), and the mass of an object can be measured by using a balance

- Volume is the "quantity of space" enclosed inside an object. It is measured in cube meters ().

The volume of a regular-shaped object can be measured by using a ruler, if we know the formula to calculate the volume of the shape of the object. However, a key has a very complex shape, so it is not possible to measure directly its volume. Therefore, it is possible to use a trick, by using a beaker full of water: by putting the key inside the beaker of water, the level of water inside the beaker raises, and the increase in volume of the water is equal to the volume of the key. The increase in volume of the water is easy to be measured, so in this way it is possible to measure the volume of the key.

a balance and a beaker of water

Explanation:

Mass is contained in the matter of an object. A balance is used to measure the mass of the key.

Since the key has complex shape, it would be difficult to measure its volume. It cannot be measured using a ruler or a meter stick. A beaker of water can be used to measure the volume of the key.

Initially there would be fixed amount of water in the beaker. when key is added in the beaker of water, the water level would rise due to the added volume of key. The volume of the key is given by subtracting the initial reading from the final reading.

seeing the graph would