Awheel has eight spokes and a radius of 25.5 cm. it is mounted on a fixed axle and is spinning at 3.75 rev/s. you want to shoot a 34.0 cm$long arrow through the wheel, parallel to this axle, without hitting any of the spokes. assume that the arrow and the spokes are very thin and evenly spaced. what minimum speed must the arrow have?

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.