Physics
Lab First Semester Final 2002 – Part I
Please mark the
appropriate letter or letters on the scantron
1. Of the following sets, which are all SI?
(a) cm, s, kg, lb mm (b)
mm, mm, g, s , in
(c) fm, ns, kg, mm, ms
(d) km, s, kg, mm,
f
2. Which length is the largest?
(a) 101 cm (b) 10-10 m (c) 1 x 102
mm
(d) 1 m (e)
none of these
3. Consider the following masses (1) 10 mg (2)
1000 mg
(3) 102 kg (4)
10-4 kg These are
ordered
in ascending size as
(a) 1, 2, 3. 4
(b) 2, 1, 4, 3 (c) 4, 3, 2, 1 (d) 2, 1, 3, 4
4. 6 x 10 –5 seconds = ____________ milliseconds
(a) 6 x 10 –2 (b) 6 x 10 1 (c) 6 x 10
–8 (d) 6 x 10 –1
5. How many significant figures do the following measurements
contain: 121.00 m, and
0.0085
s ?
(a) 5 & 5 (b) 3 & 4 (c) 5 & 4 (d) 3 & 2 (e) 5 & 2
6. A runner jogs half a lap on an oval
track. How do the distance he traveled
and his displacement compare?
(a) They are the same (b) His displacement is larger
(c) His distance traveled is larger (d) Not enough info to tell.
7. If [L] represents the dimensions of
length and [T} that of time, then the dimensions of speed are
(a) [L + T] (b) [T/L] (c) [L/T2} (d) [L/T] (e)
none of these
8. On a position-time graph, the slope at
any point is
(a) the distance traveled (b) the time
elapsed (c) the instantaneous velocity (d) the average velocity (e) the acceleration
9. Which of the following is not a vector quantity?
(a) displacement (b) acceleration (c) time (d)
velocity (e) force
10. It is possible that two vectors of
magnitude 8.0 and 3.0 can be added to produce a
resultant
with a magnitude of
(a) 12 (b) 15 (c)
8.0 (d) 3.0 (e) none of these
11. A ball is thrown with a horizontal
component of velocity of 15 m/s and a vertical
component
of velocity of 20 m/s. What is its
resultant velocity?
(a) 5 m/s (b) 25 m/s (c) 35 m/s (d) 17.5 m/s
12. The acceleration due to gravity on Earth
is accepted to be about
(a) 9.81 m/s2 (b) 1.63 m/s2 (c) 27.4 m/s2
(d) 4.6 m/s2 (e) 42
13. If we consider west to be our positive
direction, a car that is driving east and suddenly slams on its brakes will
have a ___________ velocity and a __________ acceleration.
(a) positive,
positive (b) positive, negative
(c) negative, positive (d) negative,
negative
14. Which of the following is not a
correct kinematic equation?
(a)
vf2 = vi2 + 2aDx (b) vf = vi
+ a Dt
(c)
Dx = ½ (vf - vi) Dt (d) Dx = viDt
+ 1/2g(Dt)2
15. A body moving with a constant
acceleration must experience a change in
(a) velocity (b)
speed (c)
force (d) weight
16. If [L]
represents the dimension of length and [T] that of time, then the
dimensions of
acceleration
are
(a) [L + T2] (b) [L/T] (c) [L2/T] (d) [L/T2]
17. Which of the following velocity-time
graphs shows an object with a positive initial velocity and a constant negative
acceleration?
(a) (b) (c) (d)
18. A driver traveling at 20 km/hr abruptly
stops his car over a distance of 3m.
Later, while moving at 40 km/hr, the driver again stops the car with the
same negative acceleration bringing it to a halt after
(a) 6 m (b) 9 m (c) 60 m (d) 12 m
19. Two statues of Jebediah Springfield, one
made of aluminum and one made of brass (3.2 times heavier) are dropped at the
same time from the same height of 4 meters.
They hit the ground
(a) at nearly the same time with very different
velocities
(b) at very different times with nearly the same
velocity
(c) at nearly the same time with nearly the same
velocity
(d) at very different times with very different
velocities
20. The average velocity of a coconut
during a 1-s fall from a monkey’s hand, starting from rest is
(a) 4.9
m/s (b) 9.8
m/s (c) 19.6
m/s (d) 2.0 m/s
21. A projectile is launched from ground
level and takes 1.5 seconds to reach its peak
height. How long is it in the air for total?
(a) 0.75 s (b) 1.5 s (c) 3.0 s (d) 6.0 s
22. If [L] stands for length, [T] for time,
and M for mass, the dimensions of force are
(a) [ML2] (b) [ML/T]
(c) [ML/T2] (d)
[LT/M]
23. Is it possible to devise a technique to
push on a table without it pushing back on you?
(a) Yes, out in space (b)
Yes, if someone else also pushes on it
(c) A table never pushes in the first place (d) No
24. If (with no friction) a force F
results in an acceleration a when acting on a mass m, the
tripling the mass and increasing the force sixfold will result in an
acceleration of
(a) a (b) a/2 (c) 2a (d) a/6
25. Why is it easier to keep a heavy couch sliding across a floor
than it is to get the couch
moving
in the first place?
(a) Because mk < ms (b) Because mk > ms
(c) Because of air drag (d) Once the couch is moving, there is no
friction
26. Imagine that you are standing on a
cardboard box that just barely supports your weight. If you were to jump up in the air, the box would
(a) collapse (b) be unaffected (c) spring upward
as well (d) move sideways
27. Imagine standing in a canoe in the middle
of a very still lake. If you were to
walk from the back to the front, the
canoe would
(a) remain
nearly stationary (b) advance
along with you
(c) move
in the opposite direction (d) not
enough info to say
28.
A sign is hung with two cables that
are 120 degrees apart. If the tension
in each cable is 100 N, what is the weight of the sign?
(a) 100 N (b) Zero (c) 200 N (d) 86.6 N
29. A 10-kg mass is held 1.0 m above a table
for 25 s. How much work is done during
that time period?
(a) none (b) 10 J (c) 250 J (d) 0.4 J
30. A rocket coasting along in space at some
space v fires its engines and doubling its speed, but at the same time,
it jettisons some cargo, reducing its mass to half its previous value. In the process, the rocket’s KE is
(a) unchanged (b) doubled (c) quadrupled (d) multiplied by 8
31. An arrow is fired, via a bow, straight
up. It rises for a while and then drops
back to the ground. The entire process
can be described as a series of energy transformations corresponding to
(a) KE, gravitational PE, work, KE (b) work, KE, elastic PE, gravitational PE, K
(c) work, elastic PE, KE, gravitational PE, KE (d)
elastic PE, gravitational PE, KE, work
32. How fast must a 1 kg object be moving if
its kinetic energy is 8 Joules?
(a) 1.0 m/s (b) 2.0 m/s (c) 4.0 m/s (d) 8.0 m/s
33. About how high above the Earth’s
surface (or any zero point) must a 1.0 kg mass be lifted for it to have a
gravitational PE of 1.0 J ?
(a) 10 m (b) 1.0 m (c)
0.1 m (d) 0.01 m
34. While a ball rolls down the circularly
curved track
shown to the right, its speed,
acceleration and
kinetic energy, respectively
(a) increase, increase, increase (b) decrease, decrease, decrease
(c) decrease, increase, increase (d) increase, decrease, increase
35. If Superman really is “more powerful than
a locomotive” in a physics sense, then with regard to freight trains
(a) he can pull more cars but at a lower speed
(b) he can pull fewer cars at a faster speed
(c) he can pull the same number of cars
faster/in less time
(d) he can pull twice as many cars up steeper
hills
36. If we represent the dimensions of mass,
length and time by M, L, and T respectively, then the dimensions of impulse are
(a) [ML/T] (b) [ML2/T2] (c) [ML/T2] (d) [LT/M]
37. Suppose a projectile’s speed and mass are
both doubled. Its momentum will then be
(a) doubled (b) unchanged (c) halved (d) quadrupled
38. As a rule (which is true up to a point)
the longer the barrel of a gun the greater the muzzle velocity. This is the case because
(a) on average there’s less friction
(b) the mass of the projectile decreases as it
flies down the barrel
(c) the PE of the projectile is greater (d) the force acts for a longer time
39. In which type(s) of collisions is kinetic
energy conserved?
(a) perfectly inelastic (b) perfectly
elastic
(c) both (d) neither
40. In which type(s) of collisions is
momentum conserved?
(a) perfectly inelastic (b) perfectly
elastic
(c) both (d) neither
41. While floating motionlessly in a
spacestation a 20 kg girl pushes on a 40 kg boy. He sails away at 1.0 m/s and she
(a) remains motionless (b) moves in the opposite direction at 2.0 m/s
(c) depends on if he pushes or not (d) moves in the opposite direction at 1.0 m/s
42. Two equal mass bullets traveling with the
same speed strike a target. One of the
bullets is rubber and bounces off. The
other is metal and penetrates, coming to rest in the target. Which exerts a greater impulse on the
target?
(a)
both exert the same (b) the metal one (c) the rubber one (d)
not enough info
43.
What is the equivalent of 25 degrees
in radians and 25 radians in degrees?
(a) 1.4 x 103 radians and 0.44
degrees (b) 0.44 radians and 1.4 x 103 degrees
(c) 25 radians and 25 x 2 p
degrees (d) 0.44 degrees and 2p/0.44
radians
Use
the picture below to answer questions 44-46 It shows a car of mass m
moving on a level road at a constant velocity v.
44. Where along the path is the vehicle’s net
acceleration the largest
(a)
A to B (b) B to C (c) C to D (d) D to E
45. Where along the path is the vehicle’s net
acceleration the smallest
(a) A to B (b) B to C (c) C to D (d) D to E
46. What is the magnitude of the vehicles’s
net acceleration between C and D?
(a) v2/2R (b) 2v2/R (c) 4v2/R (d) v2/4R
47. A toy airplane is traveling in a circle
at the end of a guide wire. If it is
made to go twice as fast and the radius it makes gets twice as large, the
centripetal acceleration
(a) is unchanged (b) is doubled
(c) is decreased by two (d) is
quadrupled
48. If the dimensions of length, time and
mass are L, T, and M respectively, then the dimensions of G (the gravitational
constant) are
(a) [L2/MT2] (b)
[L3/MT] (c) [L3/MT2] (d) [L3/M2T]
49. Two objects exert a gravitational force F
on one another. If one object were
to double in mass, the gravitational force would
(a) be quartered (b) be halved (c) double (d)
quadruple
50. Two objects exert a gravitational force F
on one another. If the distance between
them were to suddenly double, the gravitational force would
a) be quartered (b) be halved (c) double (d)
quadruple