Lily weighs 70 kg and has a total foot imprint area of 400 cm². Lily wishes to walk on the snow, but the snow cannot withstand pressures greater than 0.5 kPa. Determine the minimum size of the snowshoes needed (imprint area per shoe) to enable Lily to walk on the snow without sinking. Hint: Lily loves skiing!

A person wearing long snowshoes can walk across a blanket of freshly fallen snow without sinking far into the snow because   (p.s. Google snowshoe if you don't know how one looks like)    snowshoes cover a larger area than a foot and so the pressure is reduced.            the snowshoes reduce the force of the person on the snow.            the large area of the snowshoe concentrates the force of the person to a point smaller than the foot.            snowshoes push less dense snow out of the way so the person stands on more solid ice below

Aren't you supposed to multiply specific weight of mercury by 0.1 and add the atmospheric pressure

A barge of 20 ft wide and 40 ft long is loaded with rocks. Assume that the center of gravity of the rocks and the barge is located along the centerline of the top surface of the barge.If the rocks and the barge weigh 400,000 lbf, will the barge float upright or tip over?