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, ft
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 + 1/2a(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, KE
(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