Apen has a mass of 150g and a volume of 10ml. what is the density of the pen?

density (d) = m (mass) / V (volume)

d = kg/m³ or g/cm³

1mL = 1cm³

m = 150g

V =  0mL = 10cm³

d = 150g / 10mc³

d = 15g/cm³

I hope it will be good. In my school it was something like this. So the pen should have a density 15 g/cm³.

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))