Atelevision uses 150 w of power. how much energy does it use in 20 seconds ?

 Energy used by television in 20 seconds = 3000 J

Explanation:

  We have expression for power, P = Work / Time

  Here we have power of television = 150 Watts

  Time of working of television = 20 seconds.

  We need to find energy it uses in 20 seconds, that is we need to find work done by electricity in 20 seconds.

  Work done = Power x Time = 150 x 20 = 3000 J

  Energy used by television in 20 seconds = 3000 J

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 .