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2010s_1-1

# 2010s_1-1 - Physics 2101 First Exam Spring 2010 February 3...

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Physics 2101, First Exam, Spring 2010 February 3, 2010 Please turn OFF your cell phone! Write down your name and section number in the scantron form. Make sure to mark your answers in the scantron form. You can mark your answers in this exam form too, and keep it for reference. Feel free to detach, use and keep the formula sheet. No other reference material is allowed during the exam. You may use scientific or graphing calculators, but not your phone’s calculator. 1

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1. A sphere has a radius of 21 cm and a mass of 1.9 kg. Its mass density is about: (a) 2 . 0 × 10 - 6 kg / m 3 (b) 2 . 0 × 10 - 2 kg / m 3 (c) 1 . 4kg / m 3 (d) 14kg / m 3 (e) 49kg / m 3 ρ = m/V = m/ ((4 / 3) πr 3 ) 2. A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80-km trip is: (a) 40 km/h (b) 45 km/h (c) 48 km/h (d) 53 km/h v avg = D/T = 80km / 1 . 5h = 53km / h (e) 60 km/h 3. A car moves from rest on a straight line. The car initially speeds up; a short time later it decelerates to a stop and then it returns to its original position in a similar manner: First it speeds up and then slows down to a stop. Which of the following five position versus time graphs best describes the motion? Answer: (e) 4. Of the following situations, which one is impossible? (a) A body having velocity east and acceleration east (b) A body having velocity east and acceleration west (c) A body having zero velocity and non-zero acceleration (d) A body having constant acceleration and changing velocity (e) A body having constant velocity and changing acceleration 2

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