I. (20pts) Cruise is standing at a street corner. Kidman travels pass
him in her fast (I) sports car at a speed of 0. 6 c. Cruise measures the
car to be 400 cm long and 150 cm high.
(a) (6 pts) Find the car's length and height in its rest frame (in cm) ?
General information and instructions: On the blank Scantron sheet, (1) print and bubble in your
name where indicated in the upper right corner; then (2) do the same with your ID number
where indicated near the top left; then (3) bubble in your test versio
Practice Questions
You will nd questions similar to these on the test. The answers can be found at the end.
Question 1:
List at least two features that are shared by many complex systems.
Question 2: Which of the following statements are correct (circle a
1. If an object is undergoing projectile motion, then the y ANSWER UNITS
component of its acceleration (i.e. the vertical component) '
at the very top of the motion is 8
A. Zero 1. NA
B. 9.8 m/s2 directed downwards
C. 9.8 m/s2 directed upwards
D. Without
Foothold ideas: Fields
I The force between a pair of charges
is given by Coulombs law
l The force exerted by many charges on a charge
is the vector sum of the forces (superposition)
I We describe the electric effect on a charge by aeld:
a set of vectors
Chapter 4 Motion and Force: Dynamics
Vocabulary
Force any kind of push or a pull on an object. A more precise denition of force is an
action capable of accelerating an object.
Newtons First Law of Motion 7 Every body continues in its state of rest or of u
KI. A boat is traveling at 4.0 mfs as it passes the starting line of a race If the boat accelerates at
k
1.0 1n/s2 for 6.0 seconds, then the distance the boat has traveled after 6.0 seconds is
(A). 421n, (B). 18 In, (C). 26 m, (D). 20 m, (E). 14 tn
2. How