A50-kg sack is lifted a vertical distance of 2 m another 25-kg sack is lifted a vertical distance of 4 m. if both sacks are lifted their respective distances in the same time, how does the power required for each compare? how about for the case in which the lighter sack is moved the same distance in half the time?

Part a)

Here in both cases we will have same power

Part b)

Again we have same power in above two cases

Explanation:

Part a)

As we know that power is defined as the work done per unit time

now we know that both the sack is pulled upwards in same time

so we will have

so we will have

so here in both cases we will have same power

Part b)

now lighter sack will move same distance in half time

so we will have

so again we have same power in above two cases

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

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 .