# Physics Exam

Topics: Inequality, Force, Speed of sound Pages: 6 (1044 words) Published: October 21, 2012
1. A football field is 120 yd long and 50 yd wide. What is the area of the football field, in m2, if 1 yd = 91.44 cm? (Points : 5)        [pic]5.0 x 103 m2
[pic]2.4 x 103 m2
[pic]4.2 x 103 m2
[pic]3.7 x 103 m2 | |
|2. Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance| |traveled. (Points : 5)  | |      [pic]The displacement is either greater than or equal to the distance traveled. | |      [pic]The displacement can be either greater than, smaller than, or equal to the distance traveled. | |      [pic]The displacement is always equal to the distance traveled. | |      [pic]The displacement is either less than or equal to the distance traveled. |

|3. A bullet moving horizontally to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance | |of 10.0 cm. What is the average acceleration, in m/s2, of the bullet?(Points : 5)  | |      [pic]-1.25 x 103 | |      [pic]-1.25 x 106 | |      [pic]-2.50 x 103 | |      [pic]-2.50 x 106 |

|4. An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much time does it take for the | |complete increase in speed? (Points : 5)  | |      [pic]17 s | |      [pic]4.0 s | |      [pic]0.058 s | |      [pic]0.25 s |

|5. A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air | |resistance. Compare the times of fall of the two bullets. (Points : 5)  | |      [pic]The fired bullet hits first. | |      [pic]They hit at the same time. | |      [pic]The dropped bullet hits first. | |      [pic]cannot tell without knowing the masses |

|6. Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body? (Points : 5) | |      [pic]4.0 N | |      [pic]32 N | |      [pic]16 N | |      [pic]8.0 N...

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