A hypothetical “ice geode” is formed by a bubble of air around which the water has frozen, imprisoning the air itself. The geode is spherical and the air bubble inside is also spherical, sharing the same centre as in figure. a) The geode is at temperature Tg=0°C with a diameter dg=5cm and it is immersed in water at 0 °C too, Calculate the radius of the air bubble inside the geode, so that the geode would float.

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.