Can Bar and Bat Mitzvahs be held on Friday night? What did Darius of Persia replace the barter economy with in order to encourage and increase trade? In the 1800s how were rivers used to power factories of the northeast? Is Luxembourg the smallest country in the world? Which is the the largest phylum among vertebrates? How can something as large and heavy as a whole continent move around? Why does your zebra finch sound weaker when he sings? Which part of the United States has desert and semiarid climate? What causes pinging in a 2011 polaris 550 ATV? Did the 21 kid run away? Who are killing the white rhinos? How would you get 1 gallon from a 7 gallon bucket and a 1 gallon bucket? Is your table an original or fake saarinen tulip table? Which country took the lead in finding a trade route to India? What does the French word 'soeur' mean? What does m stands for the height? How do you calculate agricultural density? Will a wild cherry or prunus grow in Florida? Why is it important to save the rainforest? A bullet with a mass of 0050kg is fired from a gun of a mass 9kg the bullet has a velocity of 250ms What is the velocity with which the gun recoils?