Sabiendo que la masa de Marte es de 6,42 · 1023 kg y que su diámetro medio es de 6794 km, calcula el valor de la aceleración de la gravedad sobre la superficie del planeta. Datos: Constante de gravitación universal = 6,67 · 10–11 Nm2/kg2.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.