Test One Practice - Textbook Answers

The answers are below.  However, for questions that students email me to ask for more help, I have put explanations on this page. I will continue to update the explanation page as more requests come in.

Section 10.1

            Page 334: 4  -  one block south

Section 10.2

Page 340 - Practice problems 1 & 2

1.  0 distance covered in 20 seconds = 0 / 20 = 0 m/s

2.  280 m - 40 m = 240 meters traveled; 60 s - 40 s = 20 seconds elapsed; 240 m/20 s = 12 m/s (amazingly fast!)

Page 355: 9, 14

  9.  C

14.  C

Page 356: 23, 25, 27

23.  Tortoise:  straight line climbing from 0 to 100 meters over 40 minutes;  Hare: steeper slope for part of the time, horizontal line during the nap, steep line that climbs to just under 100 minutes at the 40 minute mark.

25.  Because the stick has the same relative motion as the water, it is traveling at the same speed as the water, so he could time how long it takes the stick to travel a certain distance.

27.  50 m/10 sec = 5 m/sec

Page 357: 1 – 6

1.  A

2.  C

3.  B

4.  D

5.  B

6.  Answers will vary, but should be something like this.  The speed at any given moment during the bike ride would be the very short distance traveled  divided by a very short moment in time, or s = d/t.  The average speed for the entire race is the total distance traveled divided by the total time.