Answer:
Explanation:
Answer:
Explanation:
The half life is the time taken for half of a radioactive substance to disintegrate.
The shorter the half life, the larger the decay constant and the faster the decay process.
For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.
With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.
If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.
If the number of half-lives increases, then the number of radioactive atoms decreases, because each half-life reduces the quantity of radioactive atoms by about half. This is due to the nature of radioactive decay, causing a consistent, exponential decrease over time.
Explanation:A hypothesis about how the number of half-lives impacts the number of radioactive atoms might be: If the number of half-lives increases, then the number of radioactive atoms decreases because approximately half of the atoms' nuclei decay with each half-life.
In the concept of radioactive decay, a half-life denotes the period of time it takes for half of the atoms in a radioactive sample to decay. When there are more half-lives that pass, this indicates more time has passed, and therefore more of the radioactive atoms would have decayed. Consequently, the number of radioactive atoms lessens over time due to this continuous decay.
For example, if you started with 1000 radioactive atoms and the half-life of this particular substance is 1 year, after one year (one half-life), there would be approximately 500 radioactive atoms remaining. After two years (two half-lives), around 250 atoms would remain, and so on. Hence, it's crucial to realize that the decrease in the number of radioactive atoms is exponential, not linear.
Learn more about half-lives and radioactive decay here:https://brainly.com/question/32852085
#SPJ11
What is the wavelength of an earthquake wave if it has a speed of 15 km/s and a frequency of 12 Hz?
Explanation:
The velocity [tex]V[/tex] of a wave is given by:
[tex]V=\lambda.f[/tex] (1)
Where:
[tex]\lambda[/tex] is the wavelength of the wave
[tex]f[/tex] is the frequency of the wave. Its unit is Hertz ([tex]1Hz=\frac{1}{s}[/tex])
So, we have to find [tex]\lambda[/tex] from equation (1):
[tex]\lambda=\frac{V}{f}[/tex] (2)
[tex]\lambda=\frac{15km/s}{12Hz}[/tex]
Finally we obtain the wavelength of the earthquake wave:
[tex]\lambda=1.25 km[/tex]
what is electric force
Electric force occurs between positive and negative electric charge. It can be calculated with formula [tex]F=\frac{Q_1Q_2}{A\epsilon_0\epsilon_r}[/tex] where F is force, Q1 and Q2 are charges, A is area of object usually ball ([tex]A=4\pi r^2[/tex]) because we describe charges as points in space like electrons and protons, [tex]\epsilon_0[/tex] is a natural dielectric constant of empty space or vacuum ([tex]\epsilon_0=8.85\times10^{-12}\mathsf{\frac{As}{Vm}}[/tex]) and [tex]\epsilon_r[/tex] also known as relative dielectric variable.
There are two types of the force:
1. Attractive electric force
2. Repulsive electric force
Attractive electric force occurs between positively and negatively charged objects while repulsive occurs between equally charged objects for eg. (positive and positive will repulse).
Why do objects not cool to absolute zero by emitting all their thermal energy
Answer:
Because the object should shrink its volume to zero, which is impossible
Explanation:
Let's talk about gases for simplicity. Ideal gases are governed by the ideal gas equation:
[tex]pV=nRT[/tex]
where
p is the gas pressure
V is the volume of the gas
n is the number of moles
R is the gas constant
T is the absolute temperature
From the formula, we see that T and V are directly proportional: therefore, in order for a gas to have an absolute temperature of zero, it must also have a volume of zero, which is impossible.
What causes electric current in a wire
Answer:
The difference in potential at two points in a wire causes electric current in a wire.
Explanation:
Electric Current:
The flow of Electric charges is called Electric Current.
An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire.
Electrons move in a wire from lower potential to higher potential because, positive charge attracts the negative charge and causes it to move towards itself.
The SI units for measuring the velocity of the car: The SI units for measuring the acceleration of the car: The SI units for measuring force: The SI units for measuring mass:
Velocity ... m/s (meters per second) and angle
Acceleration ... m/s^2 and angle
Force ... Newton (kg-m/s^2) and angle
Mass ... kilogram
Answer:
The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.
Explanation:
SI unit is the international system units.
We need to define the SI unit of velocity, acceleration, force and mass of the car
The SI unit of velocity is
[tex]v = m/s[/tex]
The SI unit of acceleration is
[tex]a = m/s^2[/tex]
The SI unit of force is
[tex]F = N=kg-m/s^2[/tex]
The SI unit of mass is
[tex]m =kg[/tex]
Hence, The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.
A tree limb of mass 12 kg falls straight down. If air resistance exerts 27 N of force on the limb as it falls, what is the net force on the tree limb
The net force is 27 n
Answer: 91N down
Explanation:
Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?
A. 2.43 kg x 1000 g/1 kg
B. 2.43 g x 1 kg/1000 g
C. 1/2.43 kg x 1000 g/1 kg
1/2.43 kg x 1 kg/1000 g
Answer:
A. 2.43 kg x 1000 g/1 kg
Explanation:
We know that the equivalence between grams and kilograms is
[tex]1 kg = 1000 g[/tex]
So, if we want to convert a mass m from kg to g, we just need to multiply the value by the factor [tex]\frac{1000 g}{1 kg}[/tex].
In this problem, the mass is
m = 2.43 kg
Therefore, multiplying by the factor above, we get
[tex]m = 2.43 kg \cdot \frac{ 1000 g}{1 kg}[/tex]
Answer:
A
Explanation:
edge 2020
A positive charge, q1, of 5 µC is 3 × 10–2 m west of a positive charge, q2, of 2 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2? magnitude: 3 N direction: east magnitude: 3 N direction: west magnitude: 100 N direction: east magnitude: 100 N direction: west
Answer:
magnitude: 100 N direction: east
Explanation:
The electrostatic force between two charges is given by
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the charges
In this problem, we have
[tex]q_1 = 5 \mu C = 5\cdot 10^{-6} C[/tex]
[tex]q_2 = 2 \mu C = 2\cdot 10^{-6} C[/tex]
[tex]r=3\cdot 10^{-2} m[/tex]
Substituting into the equation, we find the magnitude of the force
[tex]F=(9\cdot 10^9 N m^2 C^{-2})\frac{(5\cdot 10^{-6}C)(2\cdot 10^{-6}C)}{(3\cdot 10^{-2}m)^2}=100 N[/tex]
Concerning the direction, let's notice that:
- Both charges are positive, so the force between them is repulsive
- The charge q1 is west of the charge q2
- So, the force applied by q1 on q2 must be to the east (away from charge q1)
Answer:
Magnitude 100 N, direction East
Explanation:
Edge test answer confirmed
A 12–volt car battery pushes a charge through the headlight circuit with a resistance of 8.5 ohms. How much current is passing through the circuit?
Answer:
1.41176471
Explanation:
r=v/I plug it into the formula
Aman tosses a jart upward with a velocity of 14.1 m/s a 60° angle
Answer:
hold on let me check my answer
Explanation:
The correct answer is that the jart will reach a maximum height of approximately 10.2 meters.
To solve this problem, we need to analyze the vertical component of the jart's initial velocity separately from the horizontal component. Since the jart is tossed at a 60° angle, we can use trigonometry to find the vertical and horizontal components of the initial velocity.
First, let's find the vertical component of the velocity [tex](\(v_{y0}\))[/tex] using the sine function:
[tex]\[v_{y0} = v_0 \cdot \sin(\theta)\][/tex]
where [tex]\(v_0\)[/tex] is the initial velocity (14.1 m/s) and [tex]\(\theta\)[/tex] is the angle of the toss (60°). The sine of 60° is [tex]\(\sqrt{3}/2\)[/tex], so:
[tex]\[v_{y0} = 14.1 \cdot \frac{\sqrt{3}}{2}\][/tex]
Now, we can calculate the maximum height (h) using the kinematic equation for vertical motion:
[tex]\[v_{y}^2 = v_{y0}^2 - 2gh\][/tex]
where [tex]\(v_{y}\)[/tex] is the final vertical velocity (which is 0 m/s at the maximum height), (g) is the acceleration due to gravity (approximately 9.81 m/s ²), and (h) is the maximum height we want to find. Rearranging the equation to solve for (h), we get:
[tex]\[h = \frac{v_{y0}^2}{2g}\][/tex]
Substituting the value of [tex]\(v_{y0}\)[/tex] we found earlier:
[tex]\[h = \frac{(14.1 \cdot \frac{\sqrt{3}}{2})^2}{2 \cdot 9.81}\][/tex]
[tex]\[h = \frac{14.1^2 \cdot (\frac{\sqrt{3}}{2})^2}{19.62}\][/tex]
[tex]\[h = \frac{198.81 \cdot \frac{3}{4}}{19.62}\][/tex]
[tex]\[h = \frac{149.1075}{19.62}\][/tex]
h = 10.2 meters
Therefore, the jart will reach a maximum height of approximately 10.2 meters.
A lighting strike heats the air to about ______ degrees Celsius
Answer:
20,000, though, I'm not completely sure.
Explanation:
"Sound is generated along the length of the lightning channel as the atmosphere is heated by the electrical discharge to the order of 20,000 degrees C (3 times the temperature of the surface of the sun)."
What is the difference between conductor and insulator
Answer:
There are three types of material as per the condition of charge flow
1) Conductor
2) Insulator
3) Semiconductor
1) Conductors
As we know that conductors are those which offer very small resistance to the flow of charge
Resistivity of the conductors are very small
2) Insulators
These type of materials offer large resistance to the flow of charges and it will not pass the current through it
So resistivity of the insulators are large as compared to conductors
From the list of activities below, select those that can increase your carbon footprint.
planting a garden
purchasing foods processed in a factory
installing solar panels on your home
driving a car that uses gasoline
keeping non-LED lights on in your home all night
From the list of activities below, select those that can increase your carbon footprint is driving a car that uses gasoline.
What is carbon footprint?The amount of carbon dioxide released into the atmosphere due to the human activities of driving a car or burning plastics, etc is called the carbon footprint.
The gasoline contained in the cars or trucks will burn due to spark in the IC engines. This result in the production of Carbon-di-oxide.
Thus, driving a car that uses gasoline increases footprint.
Learn more about carbon footprint.
https://brainly.com/question/1270740
#SPJ1
Activities from the list that increase your carbon footprint include purchasing factory-processed foods, driving a gasoline-powered car, and using non-LED lights. These actions are less energy-efficient and lead to higher carbon emissions.
From the list of activities provided, those that can increase your carbon footprint include:
Purchasing foods processed in a factory - Factory processing often involves high energy consumption and emissions.Driving a car that uses gasoline - Gasoline combustion releases significant amounts of CO2.Keeping non-LED lights on in your home all night - Traditional incandescent bulbs are less energy-efficient than LEDs.To reduce our carbon footprint, we can switch off lights when not in use, use bicycles, walk, use public transportation, purchase energy-efficient appliances, choose fuel-efficient vehicles, and install solar panels. Engaging in the political process and supporting policies aimed at reducing carbon emissions can also lead to greater collective environmental benefits.
How much heat is absorbed by 34g iron skillet its temperature rises from 12c to 24 c ?
Answer:
[tex]1.84\cdot 10^5 J[/tex]
Explanation:
The heat absorbed by the piece of iron is given by:
[tex]Q=mC_S \Delta T[/tex]
where:
m = 34 g is the mass of the piece of iron
[tex]C_s = 450 J/g^{\circ}C[/tex] is the specific heat of iron
[tex]\Delta T=24 C-12 C=12^{\circ}C[/tex] is the variation of temperature of the piece of iron
Substituting numbers into the formula, we find
[tex]Q=(34 g)(450 J/gC)(12 C)=1.84\cdot 10^5 J[/tex]
In each cycle, a heat engine performs 710 J of work and exhausts 1480 J of heat. What is the thermal effiency?
Answer:
32%
Explanation:
For a heat engine, efficiency is work out divided by heat in:
η = Wₒ / Qᵢ
Since energy is balanced, heat in is the sum of work out and heat out:
Qᵢ = Wₒ + Qₒ
Therefore:
η = Wₒ / (Wₒ + Qₒ)
Given Wₒ = 710 J and Qₒ = 1480 J:
η = 710 / (710 + 1480)
η = 0.32
The thermal efficiency is 32%.
Why doesn’t a machine that increases force break the law of conservation of energy?
Answer:
A machine in which work input equals work output. energy can be used to do work, work can be used to transfer energy. The change in the kinetic energy of an object is equal to the net work done on the object.
hope this helps
Ohm’s law is represented by the equation I = V/R. Explain how the current would change if the amount of resistance decreased and the voltage stayed the same.
Answer:
The current is proportional to the voltage and inversely proportional to the resistance. This mean if the resistance decreased and the voltage stayed constant, the current will increase.
Explanation:
Let's star with a closed circuit with a constant voltage of 48V, and a variable resistor selector of 6, 4 and 2 Ohms.
Using Ohm's Law equation [tex]I=\frac{V}{R}[/tex]
With the variable resistor selector on 6 Ohms
[tex]I=\frac{48V}{6ohms} =8A[/tex]
Changing the selector to a 4 Ohms
[tex]I=\frac{48V}{4ohms} = 12A[/tex]
Last, changing the selector to a 2 Ohms
[tex]I=\frac{48V}{2ohms} =24A[/tex]
Power in a light bulb is voltage times current. A 10 ohm light bulb is connected to a 12 v battery. What is the power of the light bulb? *
120 W
12.2 W
10 W
1.2 W
0.83 W
14.4 W
Answer:
=14.4Watts
Explanation:
Power in a light bulb is calculated by the use of the following formula: P=VI
For the provided scenario, the current will be calculated as follows:
I=V/R
=12V/10Ω
=1.2A
Therefore P=12V×1.2A
=14.4Watts
Atoms form chemical bonds using:
A. Electrons in the innermost energy level
B. electrons in the outermost energy levels
D. Protons and electrons
A electrons in the innermost energy level
Atoms form chemical bonds using their outermost electrons, also known as valence electrons. The aim is to achieve a stable electronic configuration. An example can be seen in water molecules where oxygen shares its outermost electrons with hydrogen to form covalent bonds.
Explanation:Atoms form chemical bonds using their electrons in the outermost energy levels. These are known as valence electrons. The desire of atoms to reach a stable electronic configuration, often mimicking the electron configuration of noble gases, drives the formation of chemical bonds.
For example, in a water molecule (H2O), the oxygen atom shares its outermost electrons with two hydrogen atoms to form covalent bonds. These shared electrons provide each atom with a more stable electron configuration.
Learn more about Chemical Bonds here:https://brainly.com/question/33579397
#SPJ2
The magnetic force on a wire 274 cm long is . If electrons move through the wire in 1.90 s, what is the magnitude of magnetic field that is perpendicular to the wire?
Answer:
Matter & Energy
Math Review
Kinematics
Defining Motion
Graphing Motion
Kinematic Equations
Free Fall
Projectile Motion
Relative Velocity
Dynamics
Newton's 1st Law
Free Body Diagrams
Newton's 2nd Law
Static Equilibrium
Newton's 3rd Law
Friction
Ramps and Inclines
Atwood Machines
Momentum
Impulse & Momentum
Conservation Laws
Types of Collisions
Center of Mass
UCM & Gravity
Uniform Circular Motion
Gravity
Kepler's Laws
Rotational Motion
Rotational Kinematics
Torque
Angular Momentum
Rotational KE
Work, Energy & Power
Work
Hooke's Law
Power
Energy
Conservation of Energy
Fluid Mechanics
Density
Pressure
Buoyancy
Pascal's Principle
Fluid Continuity
Bernoulli's Principle
Thermal Physics
Temperature
Thermal Expansion
Heat
Phase Changes
Ideal Gas Law
Thermodynamics
Electrostatics
Electric Charges
Coulomb's Law
Electric Fields
Potential Difference
Capacitors
Current Electricity
Electric Current
Resistance
Ohm's Law
Circuits
Electric Meters
Circuit Analysis
Magnetism
Magnetic Fields
The Compass
Electromagnetism
Microelectronics
Silicon
P-N Junctions
Transistors
Digital Logic
Processing
Integration
Waves & Sound
Wave Characteristics
Wave Equation
Sound
Interference
Doppler Effect
Optics
Reflection
Refraction
Diffraction
EM Spectrum
Modern Physics
Wave-Particle Duality
Models of the Atom
M-E Equivalence
The Standard Model
Relativity
MAGNETISM
Magnetic Fields
The Compass
Electromagnetism
Electromagnetism
In 1820, Danish physicist Hans Christian Oersted found that a current running through a wire created a magnetic field, kicking off the modern study of electromagnetism.
Moving electric charges create magnetic fields. You can test this by placing a compass near a current-carrying wire. The compass will line up with the induced magnetic field.
To determine the direction of the electrically-induced magnetic field due to a long straight current-carrying wire, use the first right hand rule (RHR) by pointing your right-hand thumb in the direction of positive current flow. The curve of your fingers then shows the direction of the magnetic field around a wire (depicted at right).
You can obtain an even stronger magnetic field by wrapping a coil of wire in a series of loops known as a solenoid and flowing current through the wire. This is known as an electromagnet. You can make the magnetic field from the electromagnet even stronger by placing a piece of iron inside the coils of wire. The second right hand rule tells you the direction of the magnetic field due to an electromagnet. Wrap your fingers around the solenoid in the direction of positive current flow. Your thumb will point toward the north end of the induced magnetic field, as shown below.
Explanation:
How many lymphatic organs are located in the abdominal cavity
Answer:
There are 7 major organs located in the abdominal cavity.
The major organs located in the abdominal cavity include the stomach, kidneys, liver, spleen, pancreas, small intestine, and large intestine
The abdominal cavity contains two key lymphatic organs, the spleen and numerous lymph nodes. The spleen sifts pathogens from the blood while lymph nodes create and transport lymphocytes for immune defense.
Explanation:The abdominal cavity houses two primary lymphatic organs: the spleen and numerous lymph nodes. The spleen is a major secondary lymphoid organ located in the upper left quadrant of the abdomen near the stomach and left kidney. Its role is to remove pathogens from the blood, hence sometimes referred to as the 'filter of the blood.'
On the other hand, the lymph nodes are small, bean-shaped organs located along the larger lymph vessels in the abdomen. They are pivotal in developing critical immune responses and also serve as a cleaning system for the lymph before the fluid is returned to the heart.
Learn more about Lymphatic Organs here:https://brainly.com/question/13724068
#SPJ3
on the surface of planet X, the acceleration due to gravity is 16 m/s^2. What is the weight of a 6.0 kg mass located on the surface of planet X?
Answer:
96 newtons is the weight of that 6 kg mass.
Explanation:
Weight equal to mass x acceleration
6 x 16
96 newtons
That 6 kg body feels that it have 9.6 kg mass. But actually not mass is constant overall universe and weight is a variable.
Weight is the product of mass and acceleration due to gravity. The weight of a 6 kg mass located on the surface of planet X is 98 N
Weight of an object is different in different planet due to differences in acceleration due to gravity. Since mass of a body is always constant.
The acceleration due to gravity on planet earth is approximately equal to 9.8 m/[tex]s^{2}[/tex]
To calculate the weight W of a body or any object, we multiply the mass m of the body with the acceleration due to gravity g of that planet. That is,
W = mg
From the given question, the parameter given are :
m = 6 kg
g = 16 m/[tex]s^{2}[/tex]
Substitute all the parameter into the formula
W = 6 x 16
W = 98 N
Therefore, The weight of a 6 kg mass located on the surface of planet X is 98 N
Learn more here : https://brainly.com/question/19177598
If a 20 kg artillery shell is launched vertically with a velocity of 37 m/s, how high in meters does it rise? Use the acceleration due to gravity as 9.8 m/s2.
or-
how do you calculate projectile motion? What are the formulas?
1. 69.8 m
The vertical motion of the shell is a uniformly accelerated motion, with constant acceleration [tex]g=-9.81 m/s^2[/tex] towards the ground (acceleration due to gravity).
At the point of maximum height, the velocity of the projectile is zero:
v = 0
So we can find the maximum height by using the equation:
[tex]v^2 -u^2 = 2gd[/tex]
where
u = 37 m/s is the initial velocity
d is the maximum heigth
Solving for d,
[tex]d=\frac{v^2-u^2}{2g}=\frac{0^2-(37 m/s)^2}{2(-9.81 m/s^2)}=69.8 m[/tex]
2)
A projectile motion consists of two separate motions:
- A uniform motion along the x-direction, with constant velocity given by
[tex]v_x = v_0 cos \theta[/tex]
where [tex]v_0[/tex] is the initial velocity, and [tex]\theta[/tex] the angle of launch
- A unformly accelerated motion along the y-direction, with initial velocity
[tex]v_y = v_0 sin \theta[/tex]
and constant acceleration
[tex]g=-9.81 m/s^2[/tex] (acceleration due to gravity) towards the ground.
The horizontal position of the projectile at time t is given by
[tex]x(t) = v_x t[/tex]
while the vertical position is given by
[tex]y(t) = y_0 + v_0 sin \theta t + \frac{1}{2}gt^2[/tex]
where [tex]y_0[/tex] is the initial height of the projectile.
Final answer:
To calculate the maximum height an artillery shell rises, use the kinematic equation for projectile motion, substituting in the initial velocity, final velocity (0 m/s), and acceleration due to gravity, resulting in approximately 70.14 meters.
Explanation:
Calculating Projectile Motion
To calculate how high a projectile rises, we can use the following kinematic equation which is part of the projectile motion concepts:
vf^2 = vi^2 + 2ad
Where vf is the final velocity, vi is the initial velocity, a is the acceleration, and d is the displacement or height in this case. For a projectile launched vertically, its final velocity at its peak height will be 0 m/s. Hence, solving for d gives us:
d = (vf^2 - vi^2) / (2a)
Substituting the given values: vi = 37 m/s, a = -9.8 m/s2 (the negative sign indicates acceleration is opposite to the direction of the initial velocity), and vf = 0 m/s, we get:
d = (0^2 - 37^2) / (2 * -9.8)
After calculation, the maximum height the artillery shell rises is approximately 70.14 meters.
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 4kg. The carriage has —— energy. Calculate it.
Answer:
E=252J
Explanation:
The total mechanical energy of an object or system is given by:
E mech=K+U
Where K is the kinetic energy of the object and U is the potential energy of the object. The carriage, sitting motionless at the top of the hill, has only potential energy in the form of gravitational potential energy.
Gravitational potential energy is given by:
Ug=mgh
Where m is the mass of the object, g is the gravitational acceleration constant, and h is the height of the object above some specific reference point, in this case the ground 21 m below.
The weight of a stationary object at the surface of the earth is equal to the force of gravity acting on the object.
W=→Fg=mg
We are given that the carriage weighs 12 N, therefore mg=12N.
Ug=12N⋅21m
⇒Ug=252Nm=252J
Hope it helped, God bless you!
The baby carriage at the top of the hill possesses gravitational potential energy. Using the formula for potential energy (PE = m x g x h) and given values for mass, gravity, and height, we find the energy of the carriage is 823.2 Joules. The carriage has gravitational potential energy.
Explanation:The energy of the baby carriage at the top of the hill is known as gravitational potential energy, which can be calculated using the formula PE = m x g x h where m is the mass, g is the acceleration due to gravity and h is the height above the ground.
In this case, the mass (m) is 4 kg, the gravitational acceleration (g) is approximately 9.8 m/s², and the height (h) is 21 m. Plugging these values into the formula gives us a potential energy (PE) of PE = 4 kg x 9.8 m/s² x 21 m = 823.2 Joules.
Learn more about Potential Energy here:https://brainly.com/question/18741280
#SPJ2
A boy yells in a narrow valley. The sound reflects off of a boulder that is 80m away. HOW LONG will it take to hear the echo if the speed of a sound wave is 320 m/s
Answer:
0.5s
Explanation:
The answer is 0.5s as shown in the image attached.
How are step-up transformers used in the transmission of electrical energy?
A They decrease the voltage before it leaves a power plant.
B They increase the voltage for efficient long-distance transmission.
C They increase the current for efficient long-distance transmission.
D They increase the voltage and the current for a short distance
transmission
Answer:
B
Explanation:
Transformer is a device used to convert low a.c. voltage to high a.c. voltage and vice versa.
There is two types of transformer, they are:
1.Step up transformer
It converts low a.c. voltage into high a.c. voltage.
2.Step down transformer
It converts low a.c. voltage to high a.c. voltage.
What two factors will most likely change the speed of a mechanical wave?
Speed of mechanical wave (sound wave) is given by the formula
[tex]v = \sqrt{\frac{E}{\rho}}[/tex]
here we can say that speed of sound wave depends on two factors
1). E = elasticity
2). [tex]\rho[/tex] = density
also we can have the string wave speed given by the equation as
[tex]v = \sqrt{\frac{T}{\mu}}[/tex]
here we can say it will depends on
1). T = tension in the string
2)[tex]\mu[/tex] = linear mass density
Also we will have the speed of sound in gases given as
[tex]v = \sqrt{\frac{\gamma RT}{M}}[/tex]
here it depends on two factors as
1). [tex]\gamma[/tex] = Type of gas
2). T = temperature of gas
The speed of a mechanical wave is predominantly determined by the medium through which it travels and the energy of the wave itself, which is dependent on its amplitude and frequency. Changes in these factors will result in changes in the speed of the wave.
Explanation:The two primary factors that can alter the speed of a mechanical wave are the characteristics of the medium through which it is traveling and the energy of the wave itself, which is related to its amplitude and frequency. For instance, the speed of sound waves can change when they travel from one medium to another, however the frequency typically remains constant. Therefore, if the speed changes but the frequency remains the same, the wavelength has to adjust accordingly.
For example, in a guitar, the strings vibrate to produce sound. The speed of the waves on the strings, along with the wavelength, determines the frequency of the sound that we hear. All strings may be made of similar material, but they have different thicknesses and thus, different linear densities. The linear density is defined as the mass per length, and can influence the speed of the wave.
Ultimately, waves are energy in motion and their speed can be affected by any change in the medium they travel through or the energy they carry.
Learn more about Speed of Mechanical Waves here:https://brainly.com/question/30647550
#SPJ3
Which of the following accurately describes properties of valence? A. The greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. B. Metals tend to have a negative valence and tend to be electron borrowers. C. The smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. D. Nonmetallic elements tend to have a positive valence and tend to be electron borrowers.
Answer:
I've done this test a couple days ago and got a hundred. The answer you are looking for is C, The small the number of electrons and atom has to borrow or to lend, the greater the activity of the atom.
Explanation:
, The small the number of electrons and atom has to borrow or to lend, the greater the activity of the atom.
what are the similarities between thermionic emission and liquid Vapourizartion?
Answer:
they both evaperated bye heat
Explanation:
Thermionic emission and liquid vaporization are related processes where heat is the primary driver of change. Both absorb heat for transformation, thermionic emission for release of electrons and liquid vaporization to turn into steam. They also both impact their surrounding environment.
Explanation:Both thermionic emission and liquid vaporization are processes that are influenced by an increase in heat or temperature. Thermionic emission is the process whereby heat provides sufficient energy to an element enabling it to overcome forces binding it and thus, it releases electrons. On the other hand, liquid vaporization or evaporation is the process whereby a liquid takes in heat from the surroundings and transforms into a gaseous state.
The similarities between these two processes lie in the fact that both are energy-input-driven processes. In both cases, heat energy is absorbed by the substances for transformation: for thermionic emission to release of electrons and, for liquid vaporization to turn into steam. Therefore heat acts as the fundamental driver of change in both instances.
Furthermore, both processes have impact on the surrounding environment. In thermionic emission, the released electrons can affect nearby substances, and in liquid vaporization, the absorbed heat can cool the surroundings. Therefore, both these processes do not just involve the substances undergoing the changes but also influence the larger environment they are a part of.
Learn more about Heat-Driven Processes here:https://brainly.com/question/31477605
#SPJ2
What are the characteristics of a
unit?
Answer:
Two characteristics of a unit are:
It should be of convenient size.
It must be universally accepted i.e. its value must remain the same at all places and at all times.