Iceman

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How thick a coating of ice could Iceman form on his body in one second assuming a temperature of 70° F and a relative humidity of 35%?

Invisible Woman

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How many pounds of body fat would the Invisible Woman need to metabolize to provide enough energy to catch a crashing Blackhawk helicopter with her force field and bring it to a stop on the ground?

Assume that the helicopter is falling at 60 knots, that its mass is 16,000 lb, and that the distance over which her force field brought the helicopter from 60 knots to rest on the ground was 100 feet. 

Iron Man

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At its full output of 3 gigajoules per second Iron Man’s palladium-powered chest plate will be completely drained in 15 minutes.  How many grams of palladium-107 would need to decay to produce this amount of energy?

Assume palladium-107 (106.905133 amu) decays to silver-107 (106.905097 amu) and assume that 100% of the mass difference is converted to energy.

Spider-Man

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How many Big Macs would Spider-Man need to eat to have enough protein to web-swing across Manhattan?