Question

Power applied to a particle varies with time as P = (3+2 – 2t + 1) watt, where t is in second. Find the change in its kinetic energy between t = 2sec and t = 4sec​

Answer 1

Answer:

Bacteria are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.

Answer 2

Answer:

Energy supplied to the system = change in energy of system.

Since only energy of system is kinetic,

∫Pdt=ΔKE=∫243t2−2t+1dt=[t3−t2+t]24

ΔKE=43−42+4−23+22−2=46J