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