PHY 138 - Midterm 2 Practice Exam

# PHY 138 - Midterm 2 Practice Exam - Name Midterm 2 PHY138...

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Name: Midterm 2 PHY138 Fall 2006 Answer Page Please put your letter answer in the space provided below: Number Answer 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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1. A gun fires a projectile whose mass is 1 kg with a speed of 1500 m/s. What is the kinetic energy of the projectile? a. 750 J b. 2.26 × 10 6 J c. 1.13 × 10 6 J d. 1.13 × 10 3 J 2. A train whose mass is 10 6 kg stops in a distance of 2.00 km. If the coefficient of rolling friction for steel wheels on the rails is 0.0010, what was the initial speed of the train a. 39 m/s b. 880 m/s c. 6.3 m/s d. 3.1 m/s 3. A 50.0 kg skydiver is falling towards the earth. If the air resistance follows the form 2 2 1 v F D !" # where " = 1.1 kg/m 3 and her value of ! is ! = 0.50 m 2 , what will be her speed when she attains equilibrium. a. 42 m/s b. 59 m/s c. 30 m/s d. 84 m/s
4. A 0.0100 kg bullet is fired from a gun. It has a muzzle speed of 439 m/s. If the barrel is 0.254 m long, what is the average force acting on the bullet while it is traveling down the barrel? a. 7590 N b. 759 N c. 3790 N d. 379 N 5. A 2.30 kg block is sliding along a straight line on a smooth, frictionless surface. A force of 10 N is pulling in the + x direction, while a force of

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## This note was uploaded on 07/09/2008 for the course PHY 138 taught by Professor Meitzler during the Spring '08 term at Sam Houston State University.

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PHY 138 - Midterm 2 Practice Exam - Name Midterm 2 PHY138...

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