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Physics Homework

# Physics Homework - guo(rg27533 HW1 ditmire(58216 This...

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guo (rg27533) – HW1 – ditmire – (58216) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A certain corner of a room is selected as the origin of a rectangular coordinate system. If a fly is crawling on an adjacent wall at a point having coordinates (6 . 1 m , 7 . 7 m), what is the distance of the fly from the corner of the room? Answer in units of m. 002 10.0 points When an object falls through air, there is a drag force ( with dimension M · L / T 2 ) that depends on the product of the surface area of the object and the square of its velocity; i.e. , F air = C A v 2 , where C is a constant. What is the dimension for constant C ? 1. [ C ] = T 2 · L 2 M 2. [ C ] = T M 3. [ C ] = M L 3 4. [ C ] = T · L 2 M 5. [ C ] = T 2 · L M 6. [ C ] = M T 2 · L 2 7. [ C ] = T · L M 8. [ C ] = M L 2 9. [ C ] = M T 10. [ C ] = M T · L 2 003 10.0 points Consider a cube of soft, spongy material. Which piece below has the larger density? 1. cutting out a piece of the cube that has one-eighth the volume 2. Densities are the same. 3. Unable to determine 4. compressing the cube until it has one- eighth the volume 004 (part 1 of 3) 10.0 points There are roughly 10 59 neutrons and protons in an average star and about 10 11 stars in a typical galaxy. Galaxies tend to form in clus- ters of (on the average) about 10 3 galaxies, and there are about 10 9 clusters in the known part of the Universe.

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