Determine the density in si unit of a solid of mass 40g with dimension 30cm by 4cm by 3cm

Density = 0.111 g/cm^3

Explanation:

Given that

Make m = 40g

The given dimension are 30cm by 4cm by 3cm

Volume V = 30 × 4 × 3 = 360 cm^3

Density is the ratio of mass to volume.

That is,

Density = mass/volume

Substitute mass and volume into the formula

Density = 40/360

Density = 0.1111 g/cm^3

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.