Physics MCAT Review

1
Physics MCAT Review

• Larry Watson
• 105 Witmer Hall
• 777-3525
• larry_watson_at_und.nodak.edu
• Web sites
• www.und.nodak.edu/instruct/lwatson/211
• www.und.nodak.edu/instruct/lwatson/212
• www.und.nodak.edu/instruct/lwatson/mcat

2
Goal Maximize Scores

• For Success - Reasoning!!!
• meanings, not equations
• relationships, acceleration/velocity...
• concepts energy, Newtons laws, momentum
• proportional reasoning skills
• estimation skills
• Skills are more important than knowledge
• Know when to move on

3
Test Anxiety

• Anxiety is a good thing (in moderation)
• Anxiety Management 101
• Be confident - you CAN do this well
• Relaxation techniques
• breathe slowly
• breathe deeply
• focus on the immediate task - forget about
  previous sections
• whatever works

4
Other Hints

• Read questions before passagefind out what you
  need
• You may be able to answer some without reading
  the passage
• Do not over-complicate the situationinterpret
  the drawings in a straightforward way

5
Review Format

• Practice, practice, practice
• work on skills with sample questions
• avoid comprehensive review/memorizingMost of
  physics is energy, momentum, and Newtons
  laws-thats all you need!
• look for the similarities in problems

6
Passage II Q 74-81 MCAT 1

• Q 76Starting from a resting position at the left
  end of the railgun, the armature applies a
  constant force of 3.0 N to a projectile with a
  mass of 0.06 kg. How long will it take for the
  projectile to move 1.0 m?
• . 0.02 s
• . 0.04 s
• . 0.20 s
• . 0.40 s

7
Passage II Q 74-81 MCAT 1

• Q 78For a given mass, if the current were
  decreased by a factor of 2, the exit speed would
• . increase by a factor of 2
• . increase by a factor of ?2
• . decrease by a factor of ?2
• . decrease by a factor of 2

8
Passage II Q 74-81 MCAT 1

• Q 79If a projectile leaves a railgun near the
  surface of Earth with a speed of 2.0 km/s
  horizontally, how far will it fall in 0.01 s?
• . 4.9 x 10-4 m
• . 4.9 x 10-2 m
• . 9.8 x 10-2 m
• . 2.0 x 101 m

9
Passage II Q 74-81 MCAT 1

• Q 80If a projectile with a mass of 0.1 kg
  accelerates from a resting position to a speed of
  10 m/s in 2 sec, what is the average power
  supplied by the railgun to the projectile?
• . 0.5 W
• . 2.5 W
• . 5.0 W
• . 10.0 W

10
No Passage MCAT 1

• Q 90Two charged particles are a distance r
  apart. If the charges on the two particles and
  the distance between the particles are doubled,
  how does the force between the particles change?
• . It decreases by a factor of 2.
• . It stays the same.
• . It increases by a factor of 2.
• . It increases by a factor of 8.

11
Passage IV Q 94-99 MCAT 1

• Q 96The glass that is used as a beam splitter is
  replaced with glass that is identical except that
  it has a 10 higher index of refraction. Which
  of the following changes will occur to the
  pinhole image?
• . It will move.
• . It will become larger.
• . It will become smaller.
• . It will become more clear.

12
Passage IV Q 94-99 MCAT 1

• Q 97What is the approximate number of
  wavelengths of light that can travel in one
  direction within a retro- reflecting bead that
  has a diameter of 5 x 10-5 m? (Note The speed
  of light is 3 x 108 m/s, and its frequency is
  approximately 1015 Hz.)
• . 0.6
• . 1.7 x 102
• . 1.5 x 104
• . 3.3 x 106

13
Passage IV Q 94-99 MCAT 1

• Q 98If a single-wavelength laser is used in
  place of the light source and pinhole, how will
  the image on the viewing screen change?
• . It will be larger.
• . It will be less bright.
• . It will be shifted.
• . It will show stronger patterns of interference.

14
Passage IV Q 94-99 MCAT 1

• Q 99With the screen removed, an observer at
  Point A sees a virtual image of the pinhole.
  Which of the following indicates that the
  observer is viewing a virtual image?
• . It moves as the observer changes the angle of
  view.
• . It is larger than the real image.
• . It is dimmer than the real image.
• . It is fuzzier than the real image.

15
No Passage MCAT 1

• Q 113When a downward force is applied at a point
  0.06 m to the left of a fulcrum, equilibrium is
  obtained by placing a mass of 10-7 kg at a point
  0.40 m to the right of the fulcrum. What is the
  magnitude of the downward force?
• . 1.5 x 10-7 N
• . 6.5 x 10-7 N
• . 9.8 x 10-7 N
• . 1.5 x 10-6 N

16
No Passage MCAT 1

• Q 115A 0.5 kg ball accelerates from rest at 10
  m/s2 for 2 sec. It then collides with and sticks
  to a 1.0 kg ball that is initially at rest.
  After the collision, approximately how fast are
  the balls going?
• . 3.3 m/s
• . 6.7 m/s
• . 10.0 m/s
• . 15.0 m/s

17
No Passage MCAT 1

• Q 117A vertically oriented spring is stretched
  by 0.15 m when a 100 g mass is suspended from it.
  What is the approximate spring constant of the
  spring?
• . 0.015 N/m
• . 0.15 N/m
• . 1.5 N/m
• . 6.5 N/m

18
Passage X Q 134-138 MCAT 1

• Q 135Which of the following statements as(are)
  true about the kinetic energy of the projectile
  when it returns to the elevation from which it
  was launched?
• I. It is the same as when as when it was
  launched.
• II. It is dependent on the initial velocity.
• III. It is dependent on the value of p.
• . II only
• . I and II only
• . I and III only
• . II and III only

19
Passage X Q 134-138 MCAT 1

• Q 136What is the approximate total energy of the
  projectile at the highest point in its path?
  (Note Assume the the effects of air resistance
  are negligible.)
• . 92 J
• . 133 J
• . 184 J
• . 225 J

20
Passage X Q 134-138 MCAT 1

• Q 138What is the magnitude of the horizontal
  component of the air resistance on the projectile
  at any point during flight? (Note vx
  horizontal speed.)
• . (pv2)cos 40
• . (pv2)/2
• . (pvx2)sin 40
• . pvx2