The student can measure a liquid's volume by using a graduated cylinder, or a beaker. Mass can be measured by first weighing an empty container on a scale, and then by adding the liquid to the container and weighing it again.
The density of a liquid is equal to mass divided by its volume, therefore we need to find two things: mass and the volume.
To find the mass, a container should first be weighed empty and then with the liquid inside it. The difference in their weights will be the mass of the liquid.
For the volume, a measuring cylinder or a beaker can be used to measure it.
Dividing these values of the mass by the volume will give the density of the liquid.
An inelastic collision is one in which objects stick together after impact, and kinetic energy is not conserved. This lack of conservation means that the forces between colliding objects may convert kinetic energy to other forms of energy, such as potential energy or thermal energy.
If the elevator's speed is constant (in ANY direction) and you can't see out of it, then there's NO measurement you can make inside that will tell you that it's moving. Any weight you measure is normal.
