Copyright © 2015 John wiley & Sons, Inc. All rights reserved. 3.1.10. A truck dr

Question

Copyright © 2015 John wiley & Sons, Inc. All rights reserved. 3.1.10. A truck drives due south for 1.8 km in 2.0 minutes. Then, the truck turns and drives due west for 1.8 km in 2.0 minutes. Which one of the following pairs of statements is correct? a) The average speed for the two segments is the same. The average velocity for the two segments is the same. b) The average speed for the two segments is not the same. The average velocity for the two segments is the same. c) The average speed for the two segments is the same. The average velocity for the two segments is not the same. d) The average speed for the two segments is not the same. The average velocity for the two segments is not the same.

Explanation / Answer

average speed = distance / time

= 1.8 km / (2/60 hr)

= 54 km/h for both segment.

average velocity is a vector quantity,

average velocity = displacement / time

v1 = (1.8)(-j) / (2/60) = - 54 km/h j

v2 = - 54 km/h i

magnitude is same but direction is different for both,

Ans:(C)

04: 020:

(A) F_rock = (8.3)(9.8) = 81.3 N  

F_pebble = (8.2 x 10^-4)(9.8) = 8.04 x 10^-3 N  

(B) a_rock = 9.8 m/s^2

a_pebble = 9.8 m/s^2

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