Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
Phys 2030 Test 1 GSU 46 Quizs Principles Of Physics 1 Workshop Questions With Answers 2025 Correctly A+
Typology: Exams
1 / 10
This page cannot be seen from the preview
Don't miss anything!
What are the three most commonly used systems of units?
SI, Imperial, and Customary
What are the three fundamental mechanical units?
Length, mass, and time
v =
l/t
a =
v/t
ma
Fd
Power =
W/t
What is a force?
Any interaction that, when unopposed, will change the motion of an object
Newton's 1st Law - Law of Inertia
an object will remain in uniform motion unless acted upon by a force
Newton's 2nd Law
F = ma
Newton's 3rd Law
For every action there is an equal and opposite reaction
Kinetic energy
the stored energy in an object or system because of its position or configuration
What can be determined from the plot of a wave as a function of time?
Period and frequency
Which quantities would be necessary to precisely describe the motion of an object?
Velocity and Acceleration
What is the difference between work and energy?
Energy gives the ability to do work and doing work will give energy to a system.
What is the difference between mass and weight?
Weight is just the force of gravity acting on a mass.
If a car is traveling along a level road at a constant speed of 40 mph, is it in a state of equilibrium?
Yes, ignoring friction, the speed and direction of the car are not changing, so there is no net outside
force on the car.
State the conservation of energy principle.
Energy may not be created or destroyed but only moved from one system or object to another.
Restoring Force
the force acting to restore an elastic object or medium to its equilibrium state
Amplitude
the maximum displacement of the medium from equilibrium
Damping
a force like friction which will cause the periodic motion to gradually subside.
If f = 1000 Hz, what is the period?
T = 1/f = .001 sec
If a string is stretched one foot from its original rest position and released, why doesn't it stop when it
gets back to that rest position?
Because the energy given by the stretch is converted from potential to kinetic and that kinetic motion
causes it to overshoot the equilibrium position.
349 - 262 = 87 Hz
Which will produce the largest effect on a wind instrument: increase in atmospheric pressure or an increase in temperature?
Temperature remember, vSubsound = 331.4 + 0.6 TsubC
Reflection, diffraction, and interference have significant effects on the sound we hear. Which of these is responsible for our ability to hear sound through a narrow doorway?
Diffraction
A small loudspeaker is found to project high-frequency sound straight ahead, with considerably diminished sound to the rear of the speaker. However, it seems to project low-frequency sound to all parts of the room with little loss. What property of waves is responsible for this effect?
Diffraction is more pronounced with longer wavelengths so the lower frequency longer
wavelength waves bend around to the back of the speaker.
An instrument produces a pitch of 220 Hz and all harmonics. Explain how the beat frequencies reinforce the basic pitch.
If the fundamental were removed by a cheap loudspeaker, would you perceive the pitch as 220 Hz or some harmonic?
All harmonic frequencies will produce beats of 220 Hz, for example the fourth and third will produce 880
You would perceive a beat of 220 Hz.
If a string has a length of 2 feet what is the wavelength of its fundamental mode?
3rd harmonic?
Fundamental means ½ wavelength between the ends, so a complete wave is 2 L or 4 feet.
You now have 1 ½ waves in the 2 foot length, so a complete wave is 2/3 of 2 feet or 1 1/
feet.
How does increasing the tension affect the frequency of a plucked string?
String A has a mass/unit length 4 times larger than string B. All else is equal. Which one will have the higher pitch?
What will be the ratio of the pitches?
f = v/2L and velocity = (T/ m/L) 1/2 where T = tension and m/L = mass per unit length.
So, increase T you increase v which increases
String B: m/L is larger for A, that makes v smaller which makes f smaller
2 to 1. Mass/Length is 4 times larger for A but under
the square root sign. The square root of 4 is 2.
During speech or singing the nasal and oral cavities respond as a cavity resonator. What things can be changed to alter the pitch?
Opening the mouth wider, moving the tongue to create a larger or smaller cavity, etc.
If the pitch of the sound produced by the vocal cords changes with tension as the same way as a string, by what factor does the tension in the vocal cord change if the singer has a range of three octaves?
A factor of 9. Tension is under the square root so a tension change of 9 give a frequency 3
times higher.
When a 1000 Hz tuning fork is struck and held above a water-filled tube as in the lab, the first resonance is found 9 cm down from the top of the tube and the next one down at 27 cm. Find the wavelength and the speed of sound in air.
¼ wavelength is = 9 cm and ¾ wavelength = 27 cm. So, a wavelength = 36 cm and
V = wavelength x frequency = .36m X 1000 Hz = 360 m/sec
