1.  During a geological survey by ZGlobe Corporation, a particular parcel of land was found to consist of alternating layers of sand and clay. The thickness of the first clay layer was about53.8cm and the second one was about66.7cm. There was a layer of sand in between the two clay layers. If the total thickness of the three layers (claysandclay) was about160cm, what percent of the total thickness was made up of sand? Round your answer to the nearest hundredth.

 2.  The momentum (in kg m/s) of an object depends on the object's mass and velocity (momentum = mass times velocity). Suppose you are a goalkeeper on a soccer team. The ball comes at you with a velocity16m/s. If the ball has a mass of1,740grams, what is the momentum of the ball when it strikes your hand as you deflect it from the goal in an incredible diving save? _________ kg m/s


3.  Many chemical reactions produce heat. Suppose you are conducting an experiment involving a chemical reaction and the temperature begins to rise. It rises at a rate of3.2C per minute. What will the reaction temperature be in17minutes if the temperature now is18C?

 4.  Jennifer is designing a new hog watering system for a farm. There is a large tank that must store water above ground. In addition, the tank must be on stilts, so that vehicles can drive under it. She only has wood to make the stilts out of, so she wants to limit the total mass of the tank and water to a safe amount. She calculates that the support she designs will safely hold up a15,300kg mass. If the tank itself has a mass of3132.14kg, what volume of water (in liters) can it hold?


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 6.  Dr. Smith has asked you to prepare a1% potassium sulfate solution. What mass of potassium sulfate (in grams) must be dissolved in70ml of water to obtain a solution that will meet his approval?

