# Exam-1-practice-answers - PRACTICE Exam I Phys 172 Spring...

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PRACTICE Exam I, Phys 172, Spring 2009 With answers. Note: there were several very annoying “typos” in the practice exam which are fixed here. Note: 1. The equation sheet in on the back of this exam, exactly the same equation sheet will be provided to you on Wednesday with the Exam I. 2. The answers to the practice exam will be posted separately on Monday. 3. Please bring your own calculator, pencil and your university ID to the exam.

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Problems 1-4 For the next four problems consider vectors in the diagram shown below, in which each division is equal to 1 m. Problem 1 What are the components of the vector a ? A) <8, -1> m B) <9, 2> m C) <-1, 8> m D) <3, 4> m E) <4, 3> m Problem 2 What is the magnitude of the vector a ? A) 8.06 m ( ) 2 2 8 1 + - = a B) 9 m C) 8.21 m D) 8.32 m E) 5 m Problem 3 What is the unit vector in the direction of the vector a ? A) <-0.12, 0.99> ( ) 2 2 8 1 / 8 , 1 ˆ + - - = a B) <0.12, 0.99> C) <1, 1> D) <1, 0.8> E) <0.93, 0.37> Problem 4 Which one of the following statements is true about vectors a , b , c and d ? A) 0 = + + + d c b a B) d c b a & - = + C) b c a = + D) b c a + = E) c b a = - x a b c d &
Problem 5 A tennis ball of mass 57 g is served in horizontal direction and initially flies at speed 60 mph. What is its initial momentum? A) 3420 kg . m/s B) 1.5 kg . m/s hour onds mile meters hour miles kg mv p sec 3600 1600 60 057 . 0 × × = C) 1500 kg . m/s D) 3.42 kg . m/s E) 22.1 kg . m/s Problem 6 What is the magnitude of the x -component ( correction: it was meant that x-axis is horizontal ) of this tennis ball after 1 second? (gravitational force on the ball is downwards and its magnitude F=mg , where g =9.8 N/kg) A) 2.1 kg . m/s

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## This note was uploaded on 11/02/2009 for the course PHYS 172 taught by Professor ? during the Spring '08 term at Purdue.

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Exam-1-practice-answers - PRACTICE Exam I Phys 172 Spring...

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