A7-kg cube of copper (ccu = 386 j/kg-k) has a temperature of 750 k. it is dropped into a bucket containing 5.5 kg of water (cwater = 4186 j/kg-k) with an initial temperature of 293 k. let's try this again, but this time add just the minimum amount of water needed to lower the temperature of the copper to 373 k. in other words, we start with the cube of copper at 750 k and we only add enough water at 293 k so that it completely evaporates by the time the copper reaches 373 k. assume the resulting water vapor remaining at 373 k. how much water do we need ?

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)