R1-1. Calculator question
1E5 =?
A) 105
B) 106
C) Neither of these.
RI-2.
An elevator is going up at a constant speed. Near the top floor, it
starts to slow to a stop. During the period that it is slowing down,
its acceleration is
A) downward
B) upward.
C) in some other direction.
RI-3.
The "multiflash photograph" below shows a ball rolling along a
surface. The camera flashed once a second, and the time is
shown above each image.
Which graph below best represents the ball's velocity as a
function of time?
A)
)
B)
)
C)
)
D)
)
RI-4. An object's acceleration vs. time is:
a
t
Which graph best represents the object's velocity vs. time?
v
v
Pink
A)
B)
Yellow
t
v
v
C)
Blue
t
Purple:
None of these!
E)
t
D)
Green
t
RI-5. A student is asked the following question on an exam: A car
is moving at 90mph and suddenly brakes with a constant
acceleration a = –2g to a full stop. How many second does the car
take to stop?
Which equation can be used to answer the question?
A)
x  x 0  v 0t  12 at 2
B)
v  v 0  at
C)
v 2  v 02  2a (x  x 0 )

RI-6. Consider the vector A
Which equation is correct?
y
x

A
A)
Ax  A cos 
B)
Ax  A cos 
C)
Ax  A sin 
D)
Ax  A sin 
RI-7.
  
What is the direction of vector C  A  B ?
Ax = 1, Ay = 1
Bx = -2, By = 2
y
B)
A)
x
C)
D)
E) Parallel to x or y axis
RI-8.
The x- and y-coordinates of a particle as a function of time are
x ( t )  b  c t , y( t )  d  e t , where b,c,d, and e are positive
constants.
What is the direction of the velocity of the particle?
y
B
A
E None of these
C
D
x
What is the direction of the acceleration of the particle?
RI-9.
A particle is moving with constant acceleration. Its velocity vector
at two different times is shown below. What is the direction of the
acceleration?
y
A)
B)
D)
v1
v2
C)
x
E) Some other direction
Australia!
g
V
V
1
2
RI-10.
An object is moving along a circular path and is slowing down, as shown.
When at point x, the object's acceleration vector is best represented by which
arrow?
V2
C
D
x
V1
B
A
E
RI-11.
A projectile is fired at an initial speed of vo at an angle of  above the
horizontal. Which of the following expressions could possibly be the correct
expression for the range of the projectile? (Hint: check the units).
A) x  2 g v 0 t an 
B) x  2 g 2vo sin( 2 )
vo2
C) x 
sin  2 
g
D) x 
g
sin  2 
vo2
RI-12.
In the 1600's, Otto Van Güricke, a physicist in Magdeburg, fitted two hollow
bronze hemispheres together and removed the air from the resulting sphere
with a pump. Two eight-horse teams could not pull the spheres apart, even
though the hemispheres fell apart when air was re-admitted. Suppose von
Güricke had tied both teams of horses to one side and bolted the other side to
a heavy tree trunk. In this case the tension in the rope would be...
A: twice
B: exactly the same as
C: half what it was before.
RI-13. Conical pendulum
A)
B)
C)
D)
At the instant shown, which free-body diagram best indicates the
forces acting on the pendulum.
Which is larger ? A) the weight mg or B) the tension T?