physics 2 lab final
What are the units of current? (Give both the fundamental unit, and the special name)
Current is measured in Ampere (A) units.
If all the strings in the guitar have the same tension, would heavier strings vibrate at a lower or higher frequency?
If all strings on a guitar had the same tension the heavier strings would vibrate at a lower frequency. As mass increased the frequency decreased so the heavier strings vibrated in a lower frequency.
If the capacitance in the circuit is doubled, how is the half-life affected?
If the capacitance is doubled in the circuit the half-life is doubled.
Define magnetic flux and determine magnetic flux for a square coil (side= 15 cm) placed in magnetic field 0.5 T.
Magnetic flux is the total magnetic field which passes through a certain area. The magnetic flux for a square coil placed in a magnetic field is 0.01125Tm2 (equation 1).
which one is the induced voltage, on primary or secondary?
Since the coil was at rest there was no induced voltage.
If the charging voltage in the circuit is doubled, how is the half-life affected?
The charging voltage in a circuit is double the half-life is not affected.
Are electric field and force always in the same direction?
The electric field and force are always pointing in the same direction. They point the same way at the positive charge and opposite at the negative charge.
Show that the capacitive time constant RC has units of seconds.
The formula for capacitance is used by multiplying ohms law and capacitance formula (equation 1).This formula showed the time constant RC has seconds for the units.
purpose of standing waves lab
The general appearance of waves can be shown by means of standing waves in a string. This type of wave is very important because most of the vibrations of extended bodies, such as the prongs of a tuning fork or the strings of a piano, are standing waves. The purpose of this experiment is to study how the speed of the wave in a vibrating string is affected by the stretching force and the frequency of the wave.
purpose of the periodivc motion lab
The purpose of this activity is to measure the period of oscillation of a mass on the end of spring and compare the measured value to a theoretical value that is based on the mass and the spring constant of the spring
purpose of electric fields and potentials lab
The purpose of this lab is to qualitatively explore electric fields and electric potentials
purpose of ohms law lab
The purpose of this lab is to show the linear relationship between voltage and current for a resistor and explore the resistivity of wires.
purpose of hooks law 1 lab
The purpose of this lab was to determine the stretch displacement on a spring by using Hooks law.
For a mass oscillating on a spring, at what positions do the (a) velocity, and (b) acceleration ofthe mass have maximum value?
The velocity has maximum value when the mass passes through the equilibrium position. The acceleration of the mass will have a maximum value when its mass is at the extreme position. When it is at the extreme position the spring force will be maximum as well as the acceleration
Why ammeter is always connected in series with circuit?
This was done because no current will be in the circuit, therefore it has a high resistance. It was not connected in parallel because the ammeter consists of a wire with low resistance.
To plot the equation so the graph results in a straight line, what quantity do you have to plot vs. time? What is the expression for the slope of this straight line?Resistance and capacitance in a circuit
To plot the(equation 2) in a straight line the quantity plotted is lnvt vs time. The slope of a straight line is -1/RC.
Show the direction of current in each wire? The lines show the changing magnetic field.
When the magnet approaches the coil, it will repel it and the side facing the magnet will behave as the north pole. Then the opposite will act as the south pole and the current will flow clockwise. or the second case the side towards the magnet is the south pole and the opposite is the north pole
How is the period of the oscillating mass attached with spring related to spring constant?Considering that spring has negligible mass.
When the mass was hung on the spring and was released the gravity force then pulled the spring downward to complete the oscillating motions. If no force acted on the spring mass, then it would not have been a harmonic motion
if the resistance in the circuit is doubled, how is the half-life affected?
When the resistance in a circuit is doubled, the half-life is doubled.
what is purpose of RC circuit lab
as to measure the amount of charge stored and decreased in the capacitor.
Why should we connect the voltmeter in parallel with the circuit?
because a voltmeter has very high resistance. When it's connected in a series no current is in the circuit due to the high resistance.
What is the difference between electric potential and electrical potential difference?
electric potential is the work done per unit charge in order to bring a charge to a point in the electric field. The electric potential difference is the potential developed by a charge that moves from one point to another in the electric field itself.
what are the requirements for an object to move in simple harmonic motion?
for an object to move in simple harmonic motion is the restoring force must be proportional to the displacement.
How is ammeter connected in circuits? Series or parallel?
hey are connected in a circuit by a series connection. The ammeter in a series causes the full current to flow through the branch.
Define Faraday's Law
is an electromagnetism law that predicts how a magnetic field will interact with an electric circuit. When this happens, an electromotive force isproduced.
How is voltmeter connected in a circuit? Series or parallel?
is connected in a circuit by a parallel connection. Parallel connections are used because objects that are parallel have the same potential difference
What is the physical significance of Spring constant? What are the units?
is determined exactly by how much force is needed to stretch or compress the spring. Newtons/Meter
is motion of mass attached with spring simple harmonic motion? If yes, why?
is harmonic motion. Harmonic motion means a constant co-linear force is exerted on the spring mass
Define an electric field and what does it tell us??
is the field that surrounds an electrically charged particle that exerts a force.
Define Hooke's law
is the force needed to extend or compress a spring by some distance thatis proportional to that distance. Hooks's law is a restoring force which means the force exertedby the spring from the weight of the mass is directly proportional to the distance the springcompresses or extends.
Why simple harmonic motion an idealization?
it ideal because it applies only when friction, and small effects in real physical systems are neglected
What are the units of resistance? (Also give the fundamental unit, and the special name)
resistance is measured in ohms
Define resistivity? What are the units?
s the measure of an object that opposes the flow ofthe electric current through it. measured in ohm meters
. Are standing waves only observed in strings? Give one example of standing wave in longitudinal waves and explain that how is it different from standing waves produced in the string.
standing waves are not only observed in strings they can actually be found in columns of air. For example, the air inside of an organ pipe is what forms the standing wave. The sound waves and reflection, which are longitudinal, cause the development of the standing wave in this musical instrument. Standing waves are produced differently in strings than in longitudinal sound waves.In strings they are produced by two waves of the same amplitude and frequency going through the string in opposite directions
Give some example of simple harmonic motion?
swing in the park
State Lenz's law and How is it used to find direction of current due to induced voltage
tells us that the direction of the electric current is induced in a conductor by a changing magnetic field. The direction of the induced current is found when the magnetic fieldis directed to oppose the changing flux caused by the magnet approaching.
A mass of 3.0 kg is used to produce tension in a string 1.5 m long. What is thelinear mass density for this string?
the linear mass density for the string is 2 kg/m using equation, 𝜇 = 𝑚𝑎𝑠𝑠/𝑙𝑒𝑛𝑔𝑡ℎ = (3.0 𝑘𝑔)/(1.5 𝑚) = 2 𝑘𝑔𝑚
When it comes to measurements, what quantity can be measured easily? Electric field or potential. If we know one quantity, how will we determine other quantity?
the quantity that can be measured easily is potential. Since potential is generated by a set of charges, we can sum up the potentials generated algebraically. They do not have directions, so we do not have to worry about finding that as well. If we know one quantity, we could determine the other
what was purpose of series and parallel with galvanometer lab
was to construct a voltmeter from a galvanometer. A galvanometer is an instrument used for measuring electrical current
what is purpose of faradays lab
was to understand Faraday's law of induction using coils and the Pasco software on the computer.
purpose of series and parallel lab
was to understand how circuits with 2 resistors function.
To convert galvanometer to voltmeter, should we use low/high resistance connected in series/parallel?
we use a high resistance in a series
An instrument has a lowest frequency of 40 Hz. The string has mass per unit length 0.015 kg/m. Calculate the tension in the string
𝑓 = 12𝐿 √ 𝑇𝜇 = 14𝐿2 (𝑇𝜇) = 4𝐿2𝑓2𝜇, 𝑇 = 4(1𝑚)(40 𝐻𝑧)2 (0.015 𝑘𝑔/(𝑚)) = 96 𝑁
Q.4. In Q.3, calculate the frequency and wavelength of the second harmonic
𝑓 = 𝑛.2𝑙 √ 𝑇/𝜇 = 2/2𝐿 √ 𝑇/𝜇 = 2/2(1𝑚) √ 96𝑁/0.015 𝑘𝑔/𝑚= 80 𝐻𝑧
