Download PHY1 Review for Exam 9 Topics Simple Harmonic Motion Springs

PHY1
Review for Exam 9
Topics
Equations
Simple Harmonic Motion
Springs
Pendulums
Waves
Transverse
Longitudinal
Pulse
Continuous
Interference
Refraction
Diffraction
V = 2πr / T
F = ma
W = Fdcosθ
KE = ½ mv2
P = W/t
F = -kx
p = mv
v=fλ
T = 2π[m/k]1/2
T = 2π[L/g]1/2
ac = V2/r
FF = µFN
PE = mgh
E = PE + KE
P = Fv
PE = ½ kx2
Δp = FΔt
v = [Ft/(m/L)]1/2
f = 1/T
Multiple Choice Questions
1. The diagram below shows two wave pulses of equal amplitude, A, approaching point
P along a uniform string.
When the two pulses meet at point P, the vertical displacement of the string at P will
be
(1) A
(2) 2A
(3) 0
(4) A/2
2. A student in a band notices that a drum vibrates when another instrument emits a
certain frequency note. This phenomenon illistrates
(1) reflection
(2) resonance
(3) refraction
(4) diffraction
3. The spreading of a wave into the region behind an obstruction is called
(1) absorption
(2) reflection
(3) refraction
(4) diffraction
PHY1
Review for Exam 9
4. The diagram below represents a wave.
6.0 m
What is the speed of the wave if its frequency is 8 hertz?
(1) 48 m/s
(2) 16 m/s
(3) 3.2 m/s
(4) 1.6 m/s
5. A light ray strikes a mirror at an angle of 25 degrees with respect to the normal.
What is the angle of reflection with respect to the normal?
(1) 0°
(2) 25°
(3) 65°
(4) 90°
6. A star emits light corresponding to the emission spectrum of hydrogen. However the
wavelengths are shifted toward the red end of the electromagnetic spectrum. This red
shift occurs because the star is
(1) at rest relative to the earth
(2) moving away from the earth
(3) moving towards the earth
(4) moving perpendicular to the earth
7. The wavelength and frequency of a continuous transverse wave are
(1) Directly related
(2) Inversely related
(3) Not related
8. The term that is used to describe the bending of a wave around an obstruction is
called?
(1) Infraction
(2) Refraction
(3) Diffraction
(4) Contraction
PHY1
Review for Exam 9
9. The diagram below represents shallow water waves of constant wavelength passing
through two small openings, A and B, in a barrier.
Crest
Trough
Which statement best describes the interference at point P?
(1)
(2)
(3)
(4)
It is constructive, and causes a longer wavelength.
It is constructive, and causes an increase in amplitude.
It is destructive, and causes a shorter wavelength.
It is destructive, and causes an decrease in amplitude.
10. The period and frequency of simple harmonic motion are
(1) directly related
(2) inversely related
(3) not related
11. Which of the following is not a symbol for a unit of frequency in simple harmonic
motion?
(1) Hz
(2) s-1
(3) m/s
12. The Law of Reflection states that
(1) The angle of incidence must equal 90°.
(2) The angle of reflection must equal 90°.
(3) The angle of incedence must equal the angle of reflection.
(4) The angle of incedence must not equal the angle of reflection.
13. If the frequency of a wave increases the wavelength must
(1) increase
(2) decrease
(3) remain the same
14. If the source of a sound is moving towards a detector, the sound will have
(1) a higher frequency than if the source was stationary
(2) a lower frequency than if the source was stationary
(3) the same frequency as the source.
PHY1
Review for Exam 9
15. If a spring/mass system is stretched with a displacement x from its equilibrium
position, the amplitude of the simple harmonic motion with be
(1) greater than x.
(2) less than x.
(3) equal to x.
16. Which of the following is true concerning a water wave?
(1) It is a transverse wave.
(2) It is a longitudinal wave.
(3) It have properties of longitudinal and transverse waves.
(4) It has properties of neither a longitudinal nor a transverse wave.
17. If an oscillating force is applied to a system capable of vibrating with the same
frequency as the applied force
(1) the amplitude of the vibration will become very small due to resonance.
(2) the amplitude of the vibration will become very large due to resonance.
(3) the wavelength of the vibration will become very small due to resonance.
(4) the wavelength of the vibration will become very large due to resonance.
18. A node in a standing wave of a rope is
(1) a position in which a portion of the rope has zero amplitude.
(2) a position in which a portion of the rope has the maximum amplitude.
(3) directly related to the wavelength of the simple harmonic motion.
(4) inversely related to the wavelength of the simple harmonic motion.
19. During simple harmonic motion of a undamped spring/mass system, the total energy
(PE + KE) is
(1) constant
(2) decreases
(3) increases
20. A wave that has a velocity of 6.30 x 102 m/s has a frequency of 440 Hz. The
wavelength of this vibration is
(1) 1.4 m
(2) 2.8 x 105 m
(3) 0.70 m
PHY1
Review for Exam 9
Short Answer Questions (Show all work)
21. Draw two continuous waves that are in phase and that would result in constructive
addition.
22. Describe the Dopler effect that results when a source of a sound is moving away from
a detector.
23. What is the frequency of a spring mass system in which the mass is 50 g and the
spring constant is 2.0 N/m?
24. What is the wavelength of a continuous wave that has a frequency of 75 Hz and a
velocity of 25 m/s?
PHY1
Review for Exam 9
25. An elastic cord vibrates with a frequency of 3.0 Hz when a mass of 0.60 kg is hung
from it. What will its frequency be if only 0.38 kg hangs from it?
26. A fisherman notices that wave crests pass the bow of his anchored boat every 3.0 s.
He estimates that the distance between two crests is 8.5 m. How fast are the waves
moving in meters per second?
PHY1
Review for Exam 9
Answers
1. 3
2. 2
3. 3
4. 1
5. 2
6. 2
7. 2
8. 2
9. 4
10. 2
11. 3
12. 3
13. 2
14. 1
15. 3
16. 3
17. 2
18. 1
19. 1
20. 1
21. The crest and troughs must occur at the same times for the two waves.
22. If the source is moving away the frequency of sound will be lowered because the
velocity of the source causes the wavelengths to become large for the waves
moving behind the source.
23. 1.0 s-1
24. 0.33 m
25. 3.8 Hz
26. 26 m/s