PLEASE HELP FAST!! What makes a model not useful? a)if it is in proportion with the object it represents
b)if it is made of a different material than the object it represents
c)if it is not the same mass of the object it represents
d)if it is out of proportion with the object it represents

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

it breaks and dirupture other materials and other sencews from the bottom

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is