Which statements describe a situation with a displacement of zero? check all that apply.

1.  running exactly one lap around a racetrack

Explanation:

Displacement is the distance moved in a specified direction. For displacement to be zero the movement must be such that movement it should start and end at the same spot in a specified direction. Unlike other options a racetrack is defined and since it is moving around, it implies that the runner will return to its original position which completes a lap.

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 .

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west