Acontainer has the dimensions of 10 cm x 50 mm x 0.2 m. it is filled completely with 5.0 kg of a powdery ore. what is the density of the ore in g/cm3 ? (d=m/v)
0.05 g/cm3
5.0 g/cm3
50 g/cm3
500 g/cm3

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

Why is the melting of ice a physical change ?