Achunk of aluminum at 91.4°c was added to 200.0 g of water at 15.5°c. the specific heat of aluminum is 0.897 j/g°c, and the specific heat of water is 4.18 j/g°c. when the temperature stabilized, the temperature of the mixture was 18.9°c. assuming no heat was lost to the surroundings, what was the mass of aluminum added?

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?