Heellp! > .<
a large continental area covered with ice has a positive gravity anomaly. what might account for the positive gravity anomaly?

a) the thickness of ice increased recently.

b) the thickness of ice decreased recently.

c) the thickness of ice increased several tens of thousands of years ago.

d) the thickness of ice decreased several tens of thousands of years ago.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.