the tenth of a millimeter digit. If you are measuring an object with length between 25 and
53 cm, how many significant figures will result if you only use the part of the meter stick
between the 3- and 85-cm positions?
e.
more than 4
Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a
frictionless, level surface. Attached to the 8.0-kg mass is a second light string, which a
person uses to pull both blocks horizontally. If the two-block system accelerates at 1.0 m/s
2
,
what is the tension in the second string attached to the 8.0-kg mass?
a.
28 N
A jogger runs halfway around a circular path with a radius of 70 m. What, respectively, are the
magnitude of the displacement and the distance jogged?
a.
140 m, 220 m
A barefoot field-goal kicker imparts a speed of 25
m/s to a football at rest. If the football has
a mass of 0.50
kg and time of contact with the football is 0.020
s, what is the force exerted
on the foot?
c. 625 N
Four vectors all have the same magnitude. Vector 1 is at 30
°
, Vector 2 is at 135
°
, vector 3 is at 240
°
, and
Vector 4 is at 315
°
. Which vector has the greatest magnitude
x
-component and which vector has the
greatest magnitude
y
-component?
d.
Vector 1, Vector 3
A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its
acceleration downward is 7.35 m/s
2
. What would be the terminal velocity in this situation?
d.
80 m/s
If
ϕ
= 90
°
−
θ
, what is the value of sin
2
ϕ
+ sin
2
θ
?
a.
1
Which of the following expresses a principle, which was initially stated by Galileo and was
later incorporated into Newton's laws of motion?
a.
The natural condition for a moving object is to remain in motion.
Since 1983 the standard meter has been defined in terms of which of the following?
e.
the distance light travels in a certain fraction of a second

A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight
line path displacement of 60 m. What is the vehicle's acceleration if its value may be assumed to be

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