At one instant, force → F = 4.0 ˆ j N acts on a 0.25 kg object that has position vector → r = ( 2.0 ˆ i − 2.0 ˆ k ) m and velocity vector → v = ( − 5.0 ˆ i + 5.0 ˆ k ) m / s . About the origin and in unit-vector notation, what are (a) the object’s angular momentum and (b) the torque acting on the object?

Answer with Explanation:

We are given that

Mass of object,m=0.25 kg

Position vector,r=

Velocity vector,v=

a.We have to find the angular momentum of object.

Angular momentum with respect to origin is given by

Using the formula

b.Torque acting on the object,

Where

im not to sure what it is

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 .