Number 1 !!!!!!!!!!!!!!!!!
Answer:
5000 kg/m^3
Explanation:
Here. we are asked to calculate the density of the rock specimen.
we proceed as follows;
mass of water displaced is calculated by finding the difference between the actual and apparent masses
This has a value of 0.45kg - 0.36kg = 0.09kg
The rock and water that is displaced have exactly the same volume and thus their densities is the same. This makes the ratio of their masses to be the same
Ratio of masses is
0.45 / 0.09 = 5.0
Here we can see that the mass of the rock is five times the mass of the water so it must be five times denser
Thus, since the density of water is 1000 kg/m^3 , the density of rock is 5000 kg/m^3
Answer:
Explanation:
A. And B. solutions are in the attachment.
C.
When the cockroach walks towards the center of the circle, positive work is done so kinetic energy increases.
Energy remains constant is the answer you are looking for but it only applies, when no outside forces act on the object.
Answer:
Option C
A feather falls from one end of a tube to the other inside a vacuum
Explanation:
In conservative force field, which in this case is a vacuum, you expect that there will be no loss of energy to air-friction. Therefore, when a feather falls from one end of the tube to the other side which is a vacuum, we expect no energy loss. Conservative forces are the forces that are path-independent. This implies that in a closed loop, the total work done is zero. Considering the options given, only feather falls from one end of a tube to the other inside a vacuum meets the criteria