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Unformatted text preview: Phys 100 Fall 2011 Concepts of Physics: Class Test I 26 September 2011 Name: Total: /50 Instructions There are 10 questions on 5 pages. Show your reasoning and calculations and always justify your answers. Physical constants and useful formulae speed = distance traveled time elapsed s = d t acceleration = change in velocity time elapsed a = v t distance = 1 2 acceleration time 2 d = 1 2 a t 2 acceleration = net force mass a = F m net force = mass acceleration F = ma earths gravitational force = mass 9 . 8 F = m 9 . 8 gravitational force = 6 . 67 10- 11 mass 1 mass 2 distance 2 F grav = 6 . 67 10- 11 m 1 m 2 d 2 Question 1 A sulfur atom ( S ) has a mass exactly 32 times that of a hydrogen atom ( H ). Hydrogen atoms and sulfur atoms can combine to form hydrogen sulfide, H 2 S (one sulfur atom and two hydrogen atoms). Which of the following (choose one) is the correct mass ratio of sulfur to oxygen produced when hydrogen sulfide is decomposed? a) 2 to 1 (i.e. two kg of sulfur per one kg of hydrogen). b) 1 to 2 (i.e. one kg of sulfur per two kg of hydrogen). c) 64 to 1 (i.e. 64 kg of sulfur per one kg of hydrogen). d) 32 to 1 (i.e. 32 kg of sulfur per one kg of hydrogen)....
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This note was uploaded on 12/12/2011 for the course PHYS 100 taught by Professor Collins during the Fall '11 term at Mesa CC.
- Fall '11