The teacher measured the maximum height and the minimum height of the plastic duck above the screen as the wave passed. The teacher repeated his measurements. Table 4 shows the teacher’s measurements. Calculate the mean amplitude of the water wave. (Show your working as there are marks for this even if you don't get the answer right.. Multi Line Text.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

because if the tool that you are using is not balanced it there would be false mass.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.