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Math Help - cylinders and prism prob.

  1. #1
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    cylinders and prism prob.

    1.) how many square meters of tin are required to make a cylindrical bucket that has a radius of 15 cm and an altitude of 40 cm, allowing 10% for the waste?

    2.) when an object is immersed in water in a right circular cylinder 20 cm in radius, the level of water increases by 20 cm. find the volume of the object?

    3.) how many liters of water are required to fill a swimming pool which is 20 meters wide and 40 meters long, if when the pool is filled w/ water, the depth of the water increases uniformly along the length from 1 meter to 3 meters?

    tnx tnx tnx!!!
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  2. #2
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    What have you done so far please? You must know something from your text or classroom notes to at least be able to start on these. If you can do this you can be better helped as we see where you have gone right or wrong. Sometimes, in fact many times a student will have difficulty not because of what is being done now, but from what was not learned before. I've seen some minor miracles when people put in initial effort themselves as they become proud of what they CAN do and thought they couldn't.

    I'll help get you started: The surface area of a cylinder is two circles at the top and bottom [if the are included] and the outside surface. The last is found by opening up to form a rectangle. One side will be the height of the cylinder, and the other its circumference. Can you find those dimensions to get started? Can you find the area of a circle, and of a rectangle?
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