Answer to Question #137786 in Physics for Sam Far

Question

Which of the following is a vector (choose ALL that apply)

A. 11 meters
B. 30 mi/hr
C. 27 km to the West
D. -24 m/s
E. -30 degrees C
F. 3 blocks north

A physics book is moved once around the perimeter of a table of dimensions 0.5 m by 2m, coming back to its starting point. If the book ends up at its initial position, what is the magnitude of its displacement (in meters)?

A. 3 m
B. 7 m
C. 0 m
D. 5 m
E. 1 m

Given a graph of motion (position-time graph) with an equation of y = 10x, an object travels a distance of 20 meters in 2 seconds, a distance of 30 meters in 3 seconds, and a distance of 40 meters in 4 seconds. How far did the object travel between 2 sec and 4 sec?

A. 10 m
B. 50 m
C. 20 m
D. 40 m
E. 30 m

Answer 1

1) The vectors here are velocities and directions:

C. 27 km to the West

D. -24 m/s

F. 3 blocks north

2) The magnitude of displacement of the book is 0 because it returned to its initial position.

3) As we see, at 2 seconds, the object was at 20 meters, at 4 secs, it made 40 meters, which means the path was 40-20=20 m.