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Unformatted text preview: Phys 100 Fall 2011 Concepts of Physics: Class Test II 31 October 2011 Name: Total: /50 Instructions • There are 9 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 final speed = initial speed + acceleration × time v f = v i + a × t acceleration = net force mass a = F m earth’s gravitational force = mass × 9 . 8 F grav earth = m × 9 . 8 KE = 1 2 × mass × (speed) 2 KE = 1 2 m × v 2 gravPE = mass × 9 . 8 × height PE = m × 9 . 8 × h power = energy gain time elapsed P = E t efficiency = useful energy output energy input ε = E output E input frequency = 1 time per cycle f = 1 T wave speed = wavelength × frequency s = λ × f Question 1 Two balls are thrown upward above the ground. Ball A has mass 4kg and ball B has mass 2kg . At a given moment their positions are as illustrated and ball A moves with speed 8m/s while ball B moves with speed 10m/s....
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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
 collins
 Physics

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