Calculate the minimum amount of energy, in joules, required to completely melt 145 g of silver initially at 22.0°c. the melting point of silver is at 962°c. its specific heat capacity is 236 j/kg·k and its latent heat of fusion is 105 kj/kg.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Ms. hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

Hydrogen and helium are both members of?