In our lab calculations we used an approximation for the speed of light in the air: the speed of light in (...) which equals 2.997925E8 meters per second, about 3E8 meters per second.any conductorany isolator (non-conducting material)watervacuumplastic
Answers
In our lab calculations, we used an approximation for the speed of light in the air, which is 2.997925E8 meters per second, about 3E8 meters per second.
This value is also the speed of light in a vacuum, where there are no conducting or non-conducting materials that can interact with the electromagnetic waves. However, the speed of light can change when it passes through different materials. For example, the speed of light in a conductor such as metal is slower than the speed of light in a vacuum because the metal particles interact with the electromagnetic waves and cause them to slow down. On the other hand, the speed of light in an isolator or non-conducting material such as plastic or glass is slower than the speed of light in air because the molecules in these materials can also interact with the electromagnetic waves. The speed of light in water is also slower than in air or vacuum, but it is still faster than in most other materials.
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Correct question:
In our lab calculations we used an approximation for the speed of light in the air: the speed of light in (...) which equals 2.997925E8 meters per second, about 3E8 meters per second.
any conductorany isolator
(non-conducting material)
water
vacuum
plastic
Related Questions
Which of the following is a property of a transverse wave?
A. It needs a medium to travel.
B. It travels up and down.
C. They are visible to the nake eye.
D. It travels by compressing particles.
Answers
The correct answer is option B. It travels up and down. Transverse waves are characterized by the fact that they cause particles in the medium to move perpendicular to the direction of wave propagation.
What are transverse waves?Transverse waves are a type of wave that causes the particles of the medium to move up and down or side to side as the wave passes through them.
The other options are not right because:
Option A: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves do need a medium to travel, whereas transverse waves can travel through a vacuum, such as light waves.Option C: It is not necessarily true that transverse waves are visible to the unaided eye. Some transverse waves, such as light waves, are visible, but others, such as radio waves, are not.Option D: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves travel by compressing particles, whereas transverse waves travel by perpendicular vibrations.Learn more about transverse waves here:
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how is gas different from liquid?
Answers
Answer:
Gas is different from liquid. Liquid has a definite volume but takes the shape of the container it is in. Gas on the other hand, has no definite shape or volume.
Explanation:
the refraction of waves tends to concentrate wave energy ______ and disperse energy _____.
Answers
The refraction of waves tends to concentrate wave energy towards and disperse energy away.
When waves undergo refraction, they change direction as they pass from one medium to another, due to the variation in the speed of the waves. In the process of refraction, wave energy tends to concentrate towards the normal (an imaginary line perpendicular to the boundary between the two mediums) when the wave enters a medium with a higher wave velocity. This concentration of energy is due to the bending of the waves towards the normal.
On the other hand, when waves pass from a medium with a higher wave velocity to a medium with a lower wave velocity, the wave energy tends to disperse away from the normal. This dispersion occurs as the waves bend away from the normal, resulting in the spreading out of wave energy.
Overall, refraction leads to the concentration of wave energy towards the normal when waves enter a medium with higher velocity, and the dispersion of wave energy away from the normal when waves enter a medium with lower velocity.
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where is the center of gravity of the man doing the classic yoga poses shown in (figure 1)?
Answers
The center of gravity of the man doing the classic yoga poses will be as shown in first figure.
The Center of Gravity is the theoretical point in the body where the body's total weight is expected to exert force. It is important to know the center of gravity because it predicts the behavior of a body's movement when obeying gravity. It is also used in the construction of static structures such as buildings and bridges.
In a modern gravitational field, the center of gravity is identical to the center of mass. However, the two concepts do not always coincide. For the moon, the center of mass is very close to its geometric center. However, its center of gravity is slightly lower than Earth's due to the strong gravitational force of the nearby moon.
In a symmetrically shaped object made of homogenous materials, the center of gravity will match the body's geometric location. However, an asymmetrical object consisting of many components with different dimensions will have its center of gravity at some distance from its geometric center. In the hollow body or irregularly shaped body, the center of gravity in a point outside the body material.
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What would happen to the pressure as the volume approaches zero?.
Answers
Very accurate measurements over a wide range of pressure have been made for large number of real gases.
The product of P cross product with V is not constant for any gases.
The real gases the dependence shows the deviation in partial pressures of individual gas molecules and azeotropes.
The curves extrapolated with compressibility factor with the constant product for some gases if pressures are very low.
\(\alpha =\frac{Pv}{RT}\\ \\\alpha =\left \{ {{1 - ideal} \atop {\neq 1-real}} \right.\)
From Charles law the volume approaching to zero means pressure attaining infinite value. The compressibility factor is an index of deviation from ideality.
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an electric heater is rated 100w and 250vcalculate the heating element when in is use
Answers
Answer:
Answer:
3x + 8
Explanation:
Step-by-step explanation:
Remove the parenthesis and group like
terms.
x + 5 + 2x + 3
= 3x + 8
hope this helps!
3 INVESTIGATION [30] nvestigate what academics/ researchers have found by answering the questions melow. 4.1 List FIVE (mechanisms) things that the South African government is doing to deal with poverty. 4.2 Discuss the harmful effects of poverly on community's health $.3 Analyse how South African communities benefit from the above mechanisms (4/2) (8
Answers
The five initiatives that the South African government is implementing to combat poverty are the Reconstruction and Development Programme (RDP), Growth Employment and Redistribution (GEAR), The Accelerated and Shared Growth Initiative of South Africa (ASGISA), The National Development Plan (NDP), and the Social Assistance System (SAS).
A community's health is negatively impacted by poverty in a number of ways, including decreased life expectancy, increased newborn mortality, and increased death rates.The techniques listed above provide significant benefits to South African communities.The correlation between the opinions of the respondents from the Amabomvini and Cata communities about how they felt about the existence of the standards set up to distribute the benefits was considerable.To learn more about South African government visit :
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A marble rolls off the edge of a table 0.75 m high with a horizontal velocity of 1 5 m/s With what velocity does it strike the floor?
Answers
It will strike the floor horizontally with the same horizontal velocity it had when it rolled off the table, which is 1.5 m/s.
To determine the velocity with which the marble strikes the floor, we can use the principles of projectile motion. Since the marble rolls off the edge of the table horizontally, its vertical motion can be treated independently.
The vertical motion of the marble can be analyzed using the equation:
v_\(f^{2}\) = v_\(i^{2}\) + 2aΔd,
where:
v_f = final velocity
v_i = initial vertical velocity
a = acceleration due to gravity
Δd = vertical displacement (0.75 m).
Since the initial vertical velocity, we get:
v_\(f^{2}\) = 2aΔd.
Substituting the known values:
v_\(f^{2}\) = 2(-9.8 m/\(s^{2}\))(0.75 m).
Simplifying the equation:
v_\(f^{2}\) = -14.7 \(m^{2}\)/\(s^{2}\).
Taking the square root of both sides:
v_f = √(-14.7 \(m^{2}\)/\(s^{2}\)).
This means that the marble will not strike the floor vertically with a positive or negative velocity. Instead, it will strike the floor horizontally with the same horizontal velocity it had when it rolled off the table, which is 1.5 m/s.
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Usually, large amount of curent flows in a
Circuit due to two reasons ———— and ————.
Answers
Answer:
Explanation:
Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks
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By moving her arms outward, an ice skater speeds up a spin, while moving her arms inward slows down a spin. Question options: True False
false
Answers
ITS TURE.When there is no torque acting on a body, its angular momentum is constant. Net force changes momentum, while net torque changes angular momentum.
Answer: false
Explanation:
how to use equation of continuity. Pleeeeeaaaase help
Answers
Answer:
The continuity equation says that if charge is moving out of a differential volume (i.e., divergence of current density is positive) then the amount of charge within that volume is going to decrease, so the rate of change of charge density is negative.
Explanation:
I have included a picture
David is driving a steady 31.0 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.90 m/s2 at the instant when David passes.
a) How far does Tina drive before passing David?
b) What is her speed as she passes him?
Answers
a) Tina drives approximately 69.93 meters before passing David.
b) Her speed as she passes him is approximately 34.77 m/s.
To find the distance Tina drives before passing David, we can use the equation:
\(\[d = ut + \frac{1}{2}at^2\]\)
where:
d is the distance traveled,
u is the initial velocity (0 m/s for Tina),
a is the acceleration (2.90 m/s² for Tina), and
t is the time.
First, we need to determine the time it takes for Tina to catch up with David. Since David is driving at a constant speed of 31.0 m/s, the time Tina needs to catch up can be found using the equation:
\(\[t = \frac{d}{v}\]\)
where:
\(\(t\)\) is the time,
\(\(d\) \\\) is the initial distance between Tina and David (0 m), and
v is the relative velocity of Tina with respect to David (31.0 m/s).
Substituting the values, we find:
\(\[t = \frac{0\,m}{31.0\,m/s} = 0\,s\]\)
Since Tina begins to accelerate at the instant when David passes, she starts from rest and requires no time to catch up.
a) Using the equation for distance, we find:
\(\[d = ut + \frac{1}{2}at^2 = 0 + \frac{1}{2}(2.90\,m/s²)(0\,s)^2 = 0\,m\]\)
Therefore, Tina does not drive any distance before passing David.
b) Since Tina catches up with David at the same instant he passes, her speed is equal to his speed. Thus, her speed as she passes him is approximately 31.0 m/s.
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Tina drives approximately 158.2 meters before passing David. Tina's speed as she passes David is 31.0 m/s.
Explanation:To find the distance Tina drives before passing David, we need to determine the time it takes for Tina to catch up with David first. We can use the equation:
d = v0t + 0.5at2
Where d is the distance, v0 is the initial velocity, a is the acceleration, and t is the time. Rearranging the equation to solve for t:
t = (v - v0) / a
Substituting the given values:
t = (0 - 31.0 m/s) / (-2.90 m/s²)
t ≈ 10.69 seconds
To find the distance:
d = v0t + 0.5at2
d = 0 + 0.5(-2.90 m/s²)(10.69 s)2
d ≈ 158.2 meters
Therefore, Tina drives approximately 158.2 meters before passing David.
To find Tina's speed as she passes David, we can use the equation:
v = v0 + at
Substituting the given values:
v = 0 m/s + (2.90 m/s²)(10.69 s)
v ≈ 31.0 m/s
Therefore, Tina's speed as she passes David is 31.0 m/s.
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What should be the nature of fuse wire?
Answers
Answer: a fuse wire is a wire of high resistance and low melting point.
based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy? a student investigated the energy transformations that occur when a call is placed from cell phone a and received by cell phone b. the student drew a diagram to show the process. based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy? cell phone b rings as the call is received. cell phones are powered by a battery that produces the electricity used to send or receive a call. base stations are powered by a battery that produces the electricity used to receive and forward a call. the cell phone encodes the call and sends it through the air.
Answers
The evidence for the transformation of chemical energy into electrical energy in the process of making a call from cell phone A to cell phone B is shown in the diagram by the presence of the battery.
As mentioned, cell phones are powered by batteries that produce the electrical energy used to send or receive a call. The battery is the source of chemical energy that is converted into electrical energy, which powers the phone's internal circuitry and enables it to encode the call and send it through the air to the base station.
The transformation of chemical energy into electrical energy is a crucial process that enables the functioning of many electronic devices, including cell phones. Without this conversion, it would not be possible to power the internal circuitry of the phone, and it would not be able to send or receive calls. Therefore, the presence of the battery in the diagram is strong evidence that chemical energy is being converted into electrical energy to power the call from cell phone A to cell phone B.
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A moped has a mass of 120kg . It accelerates at a rate of 2 m/s^2 . What is the size of the resultant force acting on it ?
Answers
Answer:
240N
Explanation:
The formula for force is F=mass×acceleration.
Therefore, Force= 120×2= 240N
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A student notices that when calcium chloride is placed in water, the test tube feels warm. What kind of reaction has taken place?
A. Combustion Reaction
B. Endothermic Reaction
C. Exothermic Reaction
D. Endergonic Reaction
Answers
Answer:
C. Exothermic Reaction
Explanation:
Let's go through the choices
A. Combustion - Combustion is a highly exothermic / redox reaction which produces light and heat (i.e basically it bursts into flames). In the description, the only reaction is that it feels warm, hence this is not the answer.
B. Endothermic - Recall that endothermic reactions absorbs heat and thus cools the surroundings thereby making test tube feel cooler. this is obviously not the case so this is not the answer.
C. Exothermic - Recall that exothermic reactions releases heat and thus causes the surroundings thereby making the test tube feel warmer (or hotter in some cases). This describes our situation so THIS IS THE ANSWER.
D. Endergonic reactions require an input of energy from an external source that is adsorbed by the reaction (for example if heat was applied by an external source). In this case, there is no mention of additional energy sources. Hence this is probably not the answer.
Explain the terms 'in phase' and 'out of phase'
Answers
Answer: Both are difference in angles.
Explanation:
Both are difference in angles.
If two waves are moving with same angles with time the they are called in phase, if moving with different angles with time then they called as out of phase.
A book is being pushed to the right across a desk with a constant acceleration.
What is the force?
Answers
Explanation:
The force would be net positive.
How many of the large, Galilean satellites are in synchronous rotation around Jupiter (always turning the same face toward Jupiter)?
Answers
All four of the Galilean satellites are in synchronous rotation around Jupiter, always turning the same face toward Jupiter.
The inner solar system does not, however, include analogs for all of the Galilean moons' characteristics. For instance, all four of the Galilean satellites rotate synchronously as a result of Jupiter's tidal influence, ensuring that one face of each satellite is always pointed toward the parent planet.
While even Mercury's orbit is not synchronous, only Mercury among the terrestrial planets is substantially impacted by the tidal force of the Sun. The development of Jupiter and the Galilean satellites, according to many scientists, may have really resembled on a minor scale the development of the Sun and the inner planets. Studying the Galilean moon system might thus help us gain important knowledge about the processes that gave rise to the planet we live in.
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You build a boat with mass of 3100 kg that displaces 11 m^3 of water. What is the buoyant force on the boat in the water
Answers
The buoyancy force on the boat in the water has a value of 107800 N.
The buoyant force on the boat in the water can be calculated using Archimedes' principle, which states that the buoyant force on an object is equal to the weight of the fluid displaced by the object. In this case, the fluid is water, which has a density of 1000 kg/m³.
The buoyant force (Fb) can be calculated using the formula:
Fb = density of water × volume of water displaced × acceleration due to gravity
Fb = (1000 kg/m³) × (11 m³) × (9.8 m/s²)
Fb = 107800 N
Therefore, the buoyant force on the boat in the water is 107800 N.
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Work out
1. A father and daughter are sitting on a seesaw that is 2 meters long. the father has a weight of 600N and the daughter has a weight of 150N. Calculate where the father has to sit to balance the child who is sitting on the other side.
Answers
the father has to sit 0.5meter away from the kid because he is a 3/4 heavier that the kid
The diagram shows an idea for a perpetual motion machine. The car runs on electricity. As it moves along, the air moving past the car turns the generator on the roof. This generates the electricity needed to power the car.
Question on the paper
Answers
Let us begin by explaining the Energy transformation that will take place
Because the car runs on electricity, electrical energy that is stored in form of chemical energy is converted to mechanical energy that causes the car to moveNow when the car is in motion, the fan rotates, and my means of electro magnetic induction, the rotational(Mechanical Energy) possessed by the fan is converted to electrical energy which will then be converter to chemical energy stored in the battery of the carOk, let us discuss about why the idea will not work
Although the system will work, but to some extent, that is it will not sustain the process, over time the system will consume more energy than it will generate
Going my the law of thermodynamics "There is no perpetual motion machine of the first order" hence theoretically the system is not possible
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A plane can fly 390 miles in the same time as it takes a car to go 120 miles. If the car travels 90 mph slower than the plane, find the speed of the plane.
Answers
thats a hella slow plane
(FREE FALL) An object falls from an unknown height, crosses last 196m in 4s. Find the falling time and height.
Answers
Answer: An object is dropped from a height of 75.0 m above ground level.
Explanation: I hoped that helped !
To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. It is found that she weighs 690 NN when weighed in air and 48.0 NN when weighed underwater. What is her average density
Answers
The average density of athlete is 1070 kg/m³.
Mass of the athlete (in air) = 690 N
Mass of the athlete (under water) = 48.0 N
Density is given by the formula;
Density = mass/volume
Let's take volume of the athlete's body = V
Average density of the athlete's body = (Mass of the athlete (in air)/volume) + (buoyant force/volume)
Density = [Mass of the athlete (in air) - Mass of the athlete (underwater)]/ [volume of the object]
We know that, the buoyant force is equal to the weight of water displaced = 48.0N.
Buoyant force = weight of water displaced = 48.0 N.
Weight = mass * acceleration
Weight = 48 N
The average density of the athlete can be calculated as:
Density = [Mass of the athlete (in air) - Mass of the athlete (underwater)]/ [volume of the object]
Density = (690 - 48)/(690/9.8)
Density = 1.07 g/cm³ or 1070 kg/m³
Therefore, the athlete's average density is 1070 kg/m³.
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6. Solve and write answer in scientific notation: T = 21 3.6x103 mm 104 mm 5.2 x 52 6. Solve and write answer in scientific notation: T = 21 = 3.6x103 mm 104 mm 5.2x 11 7. Solve and write the answer in scientific notation: Fn = (6.67 x 10-11 Nyhed m2 kg2 |(] = (5.972x1024 kg)(1.989x1030 kg) (1.49x1011 m)2 =
Answers
The value of T in scientific notation is T = 7.56 x 10⁴ mm. The value of Fn in scientific notation is Fn = 3.522 x 10²⁰ N.
6. The given value of T is T = 21 3.6x10³ mm.
Convert this value to scientific notation:
21 3.6 x 10³ mm
= 2.1 x 10 x 3.6 x 10³ mm
= 7.56 x 10⁴ mm.
Thus, the value of T in scientific notation is T = 7.56 x 10⁴ mm.
7. The given value of Fn is
Fn = (6.67 x 10⁻¹¹ Nm² kg⁻² )
= (5.972 x 10²⁴ kg) (1.989 x 10³⁰ kg) / (1.49 x 10¹¹ m)².
Solve for Fn:
Fn = (6.67 x 10⁻¹¹ Nm² kg⁻² ) (5.972 x 10²⁴ kg) (1.989 x 10³⁰ kg) / (1.49 x 10¹¹ m)²
= 3.522 x 10²⁰ N.
Thus, the value of Fn in scientific notation is Fn = 3.522 x 10²⁰ N.
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If the net force applied by the truck ramp in the previous question is -300,000 N, how far along the ramp will the truck move as it stops?
Answers
The distance travelled by the truck before coming to a stop is 72.9 m.
What is the acceleration of the truck?
The acceleration of the truck is calculated by applying Newton's second law of motion as follows.
F = ma
a = F / m
where;
F is the net forcem is the massa = ( -300,000 ) / ( 60,000)
a = -5 m/s²
The distance travelled by the truck before coming to a stop is calculated as follows;
v² = u² + 2as
where;
v is the final velocity when the truck stops = 0u is the initial velocity of the trucks is the distance travelled0 = u² + 2as
0 = (27²) + (2)(-5)(s)
= (27²) - 10s
10s = 27²
s = ( 27² ) / 10
s = 72.9 m
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(c) Life testing was made on six non-replaceable) electrical lamps and the following results were obtained. Calculate MTTF. (5 Marks)
Answers
MTTF or Mean Time to Failure can be calculated using the given data. The term MTTF is often used to describe the expected lifetime of electronic devices and other items.
Here is how to calculate MTTF when given data:(c) Life testing was made on six non-replaceable) electrical lamps and the following results were obtained.
Calculate MTTF.The following data has been given:Number of lamps, n = 6Total time, T = 10000 hoursFailures, f = 2MTTF formula is given as:MTTF = T / n * fWhere, T = total time during which the test was conducted.n = the number of items tested.f = the number of items failed.Using the given data, we can calculate the value of MTTF as follows:MTTF = T / n * f = 10000 / 6 * 2= 1666.67 hoursTherefore, the MTTF of the six non-replaceable electrical lamps is 1666.67 hours.
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Radio stations can broadcast their signals over great distances. Which property enables a radio station signal to travel far from the source?.
Answers
The property that makes the radio waves to travel over a very large distance is the fact that it has a long wavelength.
What are radio waves?We know that radio communication have given birth to the modern communication gadgets that we have now that involves the fact that we can be able to send signals over a very long distance.
It should be noted that the use of the radio waves is made quite easy because the radio waves can be able to travel across a very large distance and can be able to move at a very fast pace from one place to the other.
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Answer:
Explanation:
a
Paul swims 7.5 kilometers in 1.5 hours. What was his average speed?