The half-life of a certain radioactive material is 42 days. an initial amount of the material has a mass of 49 kg. write an exponential function that models the decay of this material. find how much radioactive material remains after 8 days. round your answer to the nearest thousandth.

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign