What is the distance to the earth's horizon
from point P?
15.6 mi
3959 mi
3959 mi
Enter your answer as a decimal in the box.
Round only your final answer to the nearest
tenth
earth's center
X=
mi

Ineed to find the answer of this question because i dont understand it

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.)

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .