Answer:true, diamonds will scratch quartz.
Explanation: diamonds have a more compact composition. That is what makes them so hard. Quartz composition is not that compact, so diamond can scratch it.
Answer:
54.1 m at (south of east)
Explanation:
Displacement is a vector connecting the initial position with the final position of motion.
In this problem, the motion consists of two parts:
- A first movement 25 m east
- A second movement 48 m south
We can therefore write a vector representing the displacement as
where i is the unit vector indicating the east direction and j the unit vector indicating the north direction.
Therefore, the total displacement is just the magnitude of this vector:
And the direction is given by
Answer:
When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.
Explanation:
Explanation:
When there is no change in chemical composition of a substance then it is known as physical change.
When we say that mass is conserved during a physical change then it means that total mass of the substance or object will remain the same from beginning till the end.
For example, a metal box of mass 20 grams is beaten with hammer. Its shape will change which is a physical change and after beaten with the hammer its mass still remains 20 grams.
Answer:
24
Explanation:
72.0 divided by 3 is 24 so that means 24 is one third of 72.0