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
You will nd questions similar to these on the test. The answers can be found at the end.
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
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
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
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