PHY 201 - Test 1

# PHY 201 - Test 1 - Physics 201 TEST 1s 1 Given a tablespoon...

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Physics 201 TEST 1s 1) Given a tablespoon ( 15 cm 3 ) of water, find : What is the mass of one tablespoon of water is (assume the density of water is 1000 kg/m 3 ) The density of water is water 1000 kg m 3 the mass of water in V water 15 cm 3 convert to cubic meters V water 1.5 10 5 m 3 m water water V water m water 15 gm What is the charge due to the electrons in 1 molecule of water? The number of electrons in one molecule of water( H 2 O) is the sum of electrons in 2 atoms of hydrogen , N e_H 1 ,and the nuimber of electrons in one atom of oxygen, N _e_O 8 so N e_water 2 N e_H N _e_O N e_water 10 so Q molecule N e_water q e Q molecule 1.6 10 18 C What is the total charge due to all the electrons in the tablespoon of water? We determine the number of moles of water in a volume of V water 1.5 10 5 m 3 M mol_H 1 amu The molecular mass of hydrogen is The molecular mass of 0xygen is M mol_O 16 amu The molecular mass of water is M mol_water 2 M mol_H M mol_O M mol_water 18 amu The number of moles of water is n water m water M mol_water n water 0.833 mol The number of water molecules is N water N a n water N water 5.017 10 23 molecules The total electrons is N e N water N e_water N e 5.017 10 24 electrons Q T q e N e Q T 8.027 10 5 C

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2) Given the dipole below of charge |Q| and separation “a” Determine the E field (magnitude and direction) at a point “P” along the perpendicular axis of the dipole
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