Seudónimo Seudónimo
  • 15-04-2017
  • Chemistry
contestada

Describe What happens to the kinetic energy of a snowball as it rolls across the lawn and gains mass

Respuesta :

starchild3201
starchild3201 starchild3201
  • 19-04-2017

KE should decrease

Explanation:

The momentum, p(t)=m(t)⋅v(t), of the snowball should remain constant as there is no external force acting on the system, that is the snowball and the snowflakes it gathers, in the direction of travel.

i.e. ΣF=.p=0 so p=const.

As for KE, T(t)=12mv2=p22m=const.m

as mass is increasing, KE should decrease

this has greatly simplified it all, as it looks at it as a point mass

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