230 grams of copper pellets are removed from 250°C oven and immediately dropped into 200 mL of water in an insulated cup. The temperature of water raises 42°C then remains at that temperature. Calculate the following: a) Mass of water in kilograms b) The heat energy removed from copper pellets in joules . (Sp.Heat of copper is 385 J/K9°C) c) The initial temperature of water in degree celsius (Sp.Heat of water = 4186 J/kg°C)

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.