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Solution for Homework 1 | The Great Ideas of Physics | PHYS 110G, Assignments of Physics

Material Type: Assignment; Professor: Ni; Class: The Great Ideas of Physics; Subject: PHYSICS; University: New Mexico State University-Main Campus; Term: Unknown 2006;

Typology: Assignments

Pre 2010

Uploaded on 08/09/2009

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Solution for Homework #1
2.
Sun
Moon
Earth
New Crescent Nearly full Full
5. Follow a planet every night until it noticeable brightens or dims--an indication that it is closer
to or further from Earth.
8. See Figure 1.15. Mars appears "full" when it is farthest from Earth (directly on the far side
of the sun), and also when it is closest to Earth. At other times, Mars appears less-than-full,
but you will never see a "new Mars" or even a "crescent Mars." So Mars goes through partial
phases, but not complete phases.
17. Move the thumbtacks far apart.
29. 100 billion times 100 billion = 10,000,000,000,000,000,000,000 (a one followed by 22
zeros).
33. It exploded about 3500 years before 1054 A.D., or in about 2446 B.C.
Ch 2
8. Pure water is pure H2O, a pure compound. Oxygen gas is O2, containing only the element
oxygen (O), so it is an element. Liquid mercury (or any other form of mercury) is made of
only one element, mercury, so it is an element. H2SO4 (also called "sulfuric acid") is a
compound. U is an element. Air is a mixture of many different compounds and elements:
N2, O2, A (Argon), H2O, etc. He is an element. Carbon dioxide, CO2, is a compound. H2
and H are both elements (hydrogen, although of two different molecular forms: two-atom
and single-atom).
16. Assume that coal is pure carbon (C). When coal burns, each C atom attaches to two O atoms
to make CO2. If we assume, for simplicity, that C and O atoms have the same weight, then a
CO2 molecule would weigh three times as much as a single C atom. So a ton of coal makes
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Solution for Homework #

Sun

Moon

New (^) Earth Crescent Nearly full Full

  1. Follow a planet every night until it noticeable brightens or dims--an indication that it is closer to or further from Earth.
  2. See Figure 1.15. Mars appears "full" when it is farthest from Earth (directly on the far side of the sun), and also when it is closest to Earth. At other times, Mars appears less-than-full, but you will never see a "new Mars" or even a "crescent Mars." So Mars goes through partial phases, but not complete phases.
  3. Move the thumbtacks far apart.
  4. 100 billion times 100 billion = 10,000,000,000,000,000,000,000 (a one followed by 22 zeros).
  5. It exploded about 3500 years before 1054 A.D., or in about 2446 B.C.

Ch 2

  1. Pure water is pure H2O, a pure compound. Oxygen gas is O2, containing only the element oxygen (O), so it is an element. Liquid mercury (or any other form of mercury) is made of only one element, mercury, so it is an element. H2SO4 (also called "sulfuric acid") is a compound. U is an element. Air is a mixture of many different compounds and elements: N2, O2, A (Argon), H2O, etc. He is an element. Carbon dioxide, CO2, is a compound. H and H are both elements (hydrogen, although of two different molecular forms: two-atom and single-atom).
  2. Assume that coal is pure carbon (C). When coal burns, each C atom attaches to two O atoms to make CO2. If we assume, for simplicity, that C and O atoms have the same weight, then a CO2 molecule would weigh three times as much as a single C atom. So a ton of coal makes

three tons of carbon dioxide gas. The more precise answer, based on the weight ratio of 3 to 4 given in exercise 2, is that a ton of coal makes 11/3 (or 3.67) tons of carbon dioxide gas.

  1. 3.84 x 10^5 km, 3.84 x 10^8 m, 3.84 x 10^11 mm.
  2. With more air, the air molecules will hit the inside of the tire more often. With hotter air, the air molecules will hit the inside of the tire harder.
  3. How many times does 10-10 m go into 0.1 mm? Since 0.1 mm = 10-4 m, the answer is 10-

/ 10-10 = 10-4+10 = 10^6 atoms, or one million atoms thick.