A capacitor of capacitance 8. 1x10-6 F is discharging through a 1. 3 M Ω resistor. At what time will the energy stored in the capacitor be half of its initial value?
Answer in seconds and upto 1 decimal place
Answers
TimeTime when energy stored in the capacitor will be half of its initial value=7.3s
To find the time at which the energy stored in the capacitor will be half of its initial value, we can use the formula for the time constant (τ) of an RC circuit and the fact that energy is halved when the voltage across the capacitor is reduced to 1/√2 of its initial value.
The time constant (τ) of the RC circuit is given by τ = R * C, where R is the resistance and C is the capacitance.
τ = (1.3 * 10^6 Ω) * (8.1 * 10^-6 F) = 10.53 seconds
Now, we can use the formula for discharging a capacitor: V(t) = V_initial * e^(-t/τ)
We need to find the time (t) when V(t) = V_initial / √2. So:
V_initial / √2 = V_initial * e^(-t/10.53)
Divide both sides by V_initial:
1 / √2 = e^(-t/10.53)
Take the natural logarithm of both sides:
-ln(√2) = -t / 10.53
Now, solve for t:
t = 10.53 * ln(√2) ≈ 7.3 seconds
So, the energy stored in the capacitor will be half of its initial value at approximately 7.3 seconds.
Visit https://brainly.com/question/29301875 to learn more about capacitors
#SPJ11
Related Questions
how much kinetic energy is produced when an object having mass of 50gm throwing with velocity 80m/s?
Answers
Answer:
KE = 160 J
Explanation:
KE = 1/2mv²
mass= 50gm = 0.05kg
velocity = 80
KE = 1/2 x 0.05 x 80²
= 1/2 x 0.05 x 6400
= 160
The kinetic energy produced in an object is equal to 160 J.
What is the kinetic energy and potential energy?The energy possessed by a moving body due to its motion is known as kinetic energy. Work must be done in order to change the kinetic energy of a moving object.
The kinetic energy of a moving body can be measured from the formula mentioned below:
K.E. = ½mv² where ‘m’ is the mass and ‘v’ is the velocity of the object.
Potential Energy (P.E.) can be described as the stored energy in an object due to its position and is expressed as P.E = mgh where m, g, and h are the mass, gravitational acceleration, and height respectively.
Given, the mass of the object =, m = 50 g = 0.05 Kg
The velocity of the object, v = 80 m/s
The kinetic energy = (1/2)× 0.05 ×(80)²
K.E. = 160 J
Learn more about kinetic energy, here:
brainly.com/question/15764612
#SPJ2
The negative work done is equal to the difference in the......... Electric potential energy Electric flux Electric potential Electric dipole
Answers
Answer:
Electric potential energy
Explanation:
The Electric potential energy of a system is less than that carried out by electrostatic forces during the development of the system (as long as charges are initially cut infinitely).
The change in potential energy between an initial and final configuration is equal to minus the work done by the electrostatic forces.
What is the change of GPE for a 8.0 kg object which is lowered from an initial height of 10 m above the floor to a final height of 4.0 m above the floor?
Answers
The change in gravitational potential energy, GPE for the 8 Kg object which is lowered from a height of 10 m to 4 m is -470.4 J
How do I determine the change in potential energy of the object?We'll begin by obtaining the initial potential energy. Details below:
Mass of object (m) = 8 KgInitial height (h₁) = 10 mAcceleration due to gravity (g) = 9.8 m/s² Initial potential energy (PE₁) = ?PE₁ = mgh₁
PE = 8 × 9.8 × 10
PE = 784 J
Next, we shall determine the final potential energy. Details below:
Mass of object (m) = 8 KgInitial height (h₂) = 4 mAcceleration due to gravity (g) = 9.8 m/s² Final potential energy (PE₂) = ?PE₂ = mgh₂
PE = 8 × 9.8 × 4
PE = 313.6 J
Finally, we shall determine the change in the potential energy. This is shown below:
Initial potential energy (PE₁) = 784 JFinal potential energy (PE₂) = 313.6 JChange in potential energy (ΔPE) =?ΔPE = PE₂ - PE₁
ΔPE = 784 - 313.6
ΔPE = -470.4 J
Thus, the change in potential energy is -470.4 J
Learn more about potential energy:
https://brainly.com/question/22274239
#SPJ1
A body with mass 4 kg moves with a velocity of 108km/h
Calculate it kinetic
energy
Answers
Explanation:
The answer is in the pic above
three balls are in water. ball 1 floats, with half of it exposed above the water level. ball 2, with a density less than the density of water is held below the surface by a cord anchored to the bottom of the container, so that it is fully submerged. ball 3, of same radius as ball 2, but of greater mass, is suspended from a rope so that it is fully submerged.
Answers
The correct statement about the ball 1 is the magnitude of buoyancy force is equal to that of ball's weight.
The upward force exerted on an object that is wholly or partially immersed in a fluid is called upthrust.
Ball 1 is floating on water.
Weight of the ball 1 is Fg = m₁g is acting vertically downward.
Force of buoyancy Fb = ρvg is acting vertically upwards
Net force acting on the ball is zero, Fg = Fb
As the ball 1 floats without sinking, it is in equilibrium.
This means that the net downward force is balanced by the net upward force.
To know more about the buoyancy:
https://brainly.com/question/16172991
#SPJ4
What fraction of chlorine-36 remains UN-decayed after 800,000 years?
Answers
The organisms and environments that make up a community, called an Response area, are constantly changing. Sudden and violent events, such as Response area from the ocean and Response area, that often cause these changes are called Response area. Response area results when rainfall exceeds the holding capacity of a drainage system.
Answers
Answer:
ecosystem; hurricanes and tornadoes; catastrophic events.; Fooding; moving water; soil
Explanation:
After using the word bank to fill in the blanks in the passage, the passage reads;
"The organisms and environments that make up a community called an ecosystem are constantly changing. Sudden and violent events, such as hurricanes and tornadoes that often cause these changes are called catastrophic events. Fooding results when rainfall exceeds the holding capacity of a drainage system. The energy of the fast-moving water and the layers of sediment carried by it can uproot or bury plants, reshape the soil and destroy roads and buildings."
a pulse covers a distance of 5m in 15seconds . Calculate the sped of the pulse.
Answers
According to the question the speed of pulse is = 0.33m/s
What does "speed" in science mean?Velocity is the pace and direction of either an object's movement, whereas speed is now the time rate which an object is travelling along a path. In other words, velocity is a vector, whereas speed would be a scalar value. If you determine how far an object travels in a certain amount of time, you can calculate its speed.For instance, an automobile is moving at a pace of 70 miles per hour if it covers 70 miles in an hour .
How is speed measured?The equation for speed can be obtained by simply dividing time by distance.
To learn more about speed visit:
https://brainly.com/question/13232071
#SPJ1
A 15N block is sliding at constant speed across the frictionless floor of an ice rink.
Answers
Answer:
so, why we have to find here..
stay safe healthy and happy.a garden has a circular path of radius 50 m . john starts at the easternmost point on this path, then walks counterclockwise around the path until he is at its southernmost point. part a what is the magnitude of john's displacement?
Answers
John's displacement is 50 meters, directed towards the southwest.
John starts at the easternmost point on the circular path and walks counterclockwise until he reaches the southernmost point. Since he is walking counterclockwise, his displacement will be directed towards the southwest. The magnitude of his displacement is equal to the radius of the circular path, which is 50 meters. Therefore, John's displacement is 50 meters, directed towards the southwest.
Displacement is a vector quantity that represents the change in position from the initial point to the final point. It includes both the magnitude (distance) and the direction. In this case, John's displacement is determined by the distance he has traveled around the circular path and the direction in which he is walking. Since John is walking counterclockwise, his displacement will be in the opposite direction of the clockwise path.
The magnitude of John's displacement is equal to the radius of the circular path because he starts and ends at points that are on the path. In this scenario, the radius is given as 50 meters, so the magnitude of John's displacement is also 50 meters. It represents the straight-line distance from the initial point (easternmost) to the final point (southernmost).
Learn more about displacement
brainly.com/question/11934397
#SPJ11
Which two phrases describe a situation that will cause a stationary object to
start moving?
A. A net force equal to 0
B. A net force greater than 0
C. Unbalanced forces
D. Balanced forces
(two phrases)
Answers
Answer:
A net force greater than 0 is the answer
Explanation:
trust
Answer:
b c
Explanation:
Tyler wants to learn about the types of insects in the soil near his house. Which would be a benefit of carrying out a descriptive investigation?
He could collect a large amount of data for a low cost.
He could control most of the variables affecting the insects.
He would get results that might change after the investigation.
He would be able to study cause-and-effect relationships.
Answers
Tyler wants to learn about the types of insects in the soil near his house. He could collect a large amount of data for a low cost.
Types of investigation :Descriptive investigation, comparative investigation, and experimental investigation are the three types of investigations that scientists use to research and create explanations for events in nature.
What is the benefit of carrying out a descriptive investigation?Providing descriptions is the aim of descriptive research. It should describe phenomena in a factual, precise, and organized manner without attempting to infer their causes. It does not provide an explanation for the how, when, or reasons why a specific phenomenon occurred.
Methods of investigation :In various situations, scientists employ a variety of investigational techniques. These techniques include fair testing, identifying and classifying, modeling, pattern seeking, and researching (in no particular order). According to research, fair testing dominates science instruction.
To know more about comparative investigation :
https://brainly.com/question/12042816
#SPJ9
1. A satellite (mass = 4.44 x 109 kg) travels in orbit around the Earth at a distance of 1.9 x 10'm above
Earth's surface. What is the force of gravitational attraction between the satellite and Earth?
Answers
Answer:
The force of gravitational attraction between the satellite and Earth is \(2.587\times 10^{10}\) newtons.
Explanation:
Statement is incorrect. Correct statement is:
A satellite (\(m = 4.44\times 10^{9}\,kg\)) travels in orbit around the Earth at a distance of \(1.9\times 10^{6}\,m\) above Earth's surface. What is the force of gravitational attraction between the satellite and Earth?
The gravitational force experimented by the satellite (\(F\)), in newtons, is calculated by Newton's Law of Gravitation, whose equation is defined by following formula:
\(F = \frac{G\cdot m \cdot M}{R^{2}}\) (1)
Where:
\(G\) - Gravitational constant, in cubic meters per kilogram-square second.
\(m\) - Mass of the satellite, in kilograms.
\(M\) - Mass of the Earth, in kilograms.
\(R\) - Distance of the satellite with respect to the center of the Earth, measured in meters.
If we know that \(G = 6.674\times 10^{-11}\,\frac{m^{3}}{kg\cdot s^{2}}\), \(m = 4.44\times 10^{9}\,kg\), \(M = 5.972\times 10^{24}\,kg\) and \(R = 8.271\times 10^{6}\,m\), then the force of gravitational attraction between the satellite and Earth is:
\(F = 2.587\times 10^{10}\,N\)
The force of gravitational attraction between the satellite and Earth is \(2.587\times 10^{10}\) newtons.
which is larger 15mm or 0.15cm
Answers
Answer:
1 cm = 10mm
Explanation:
hey there both are equal
Ana wonders how light can affect a mystery material. The table below shows what happens when different types of light hit the mystery material.
Answers
The light can definitely change the mystery material. This can occur through a change in temperature or color (option C).
A material is affected by light mainly if the material absorbs the light. Based on the chart, we know this mystery material can absorb two types of light:
Red light.Yellow light.Moreover, this phenomenon can lead to two main changes:
Change in temperature: Light affects materials by increasing their temperature of these. A common example is the way the temperature of an object increases if it is exposed to sunlight.Change in color: Some materials react to light by changing their color.Based on this, the material can change its color or temperature.
Note: This question is incomplete; here is the missing part:
A. Yes, but the mystery material can change in only one way, such as by getting warm, because all the light that a material absorbs will affect that material in the same way.
B. No. The mystery material can’t change because the light is not a physical thing. Light cannot change physical things like the mystery material.
C. Yes and the mystery material can change in one or two different ways, such as by getting warm and/or changing color, because different types of light can cause different changes to a material when they are absorbed.
D. There is no way to know whether the mystery material will change or not.
Learn more about sunlight in: https://brainly.com/question/1603783
Calculate a 5.0 kg ball on the end of a chain is whirled at a constant speed of 1.0 m/s in a horizontal circle of radius 3.0 m. What is the work done by the centripetal force during one revolution?
Answers
The work done by the centripetal force during one revolution is 31.5 J.
To find the work done by the centripetal force during one revolution, we can use the formula:
W = Fc × d
where W is the work done, Fc is the centripetal force, and d is the distance traveled in one revolution.
First, we need to find the centripetal force. We can use the formula:
\(Fc = mv^2 / r\)
where m is the mass of the ball, v is its speed, and r is the radius of the circle.
Plugging in the values we get:
\(Fc = (5.0 kg) × (1.0 m/s)^2 / 3.0 m\)
Fc = 1.67 N
Next, we need to find the distance traveled in one revolution. The circumference of the circle is:
C = 2πr = 2π(3.0 m) = 18.85 m
So the distance traveled in one revolution is equal to the circumferenc
d = 18.85 m
Now we can calculate the work done by the centripetal force:
W = Fc × d
W = (1.67 N) × (18.85 m)
W = 31.5 J
Learn more about centripetal force
https://brainly.com/question/11324711
#SPJ4
Hello! I'd be happy to help you with this problem. Here's a step-by-step explanation using the terms "speed," "radius," "work done," and "centripetal force":
1. First, we need to find the centripetal force acting on the 5.0 kg ball. The formula for centripetal force (F_c) is:
F_c = (m * v^2) / r
where m = mass (5.0 kg), v = speed (1.0 m/s), and r = radius (3.0 m).
2. Plug the values into the formula:
F_c = (5.0 kg * (1.0 m/s)^2) / 3.0 m
F_c = (5.0 kg * 1.0 m^2/s^2) / 3.0 m
F_c = 5.0 N
3. Now, we need to find the work done (W) by the centripetal force during one revolution. In this case, the work done is zero because the force acts perpendicular to the displacement of the ball, and the angle between the force and displacement is 90 degrees.
For work done, the formula is:
W = F_c * d * cos(theta)
where d is the displacement and theta is the angle between the force and displacement.
4. Since the angle (theta) is 90 degrees, cos(theta) = 0. Therefore,
W = 5.0 N * d * 0
W = 0 J (Joules)
So, the work done by the centripetal force during one revolution is 0 Joules.
Q3)A) A certain class C amplifier transistor is on for 10 percent of the input cycle. If Vce (sat) =0.18 V and Ic( sat )=25 mA, what is the average power dissipation for maximum output?
Answers
Average power dissipation for maximum output in the class C amplifier is 0.045mW.
To calculate the average power dissipation for maximum output in a class C amplifier, we need to consider the conduction angle and the voltage and current values provided. The conduction angle represents the percentage of the input cycle during which the transistor is conducting.
1. Calculate the average collector current (Ic_avg):
Ic_avg = Ic(sat) * conduction angle
= 25mA * 0.10
= 2.5mA
2. Calculate the average collector-emitter voltage (Vce_avg):
Vce_avg = Vce(sat) * conduction angle
= 0.18V * 0.10
= 0.018V
3. Calculate the average power dissipation (P_avg):
P_avg = Ic_avg * Vce_avg
= 2.5mA * 0.018V
= 0.045mW (milliwatts)
Therefore, the average power dissipation for maximum output in the class C amplifier is 0.045mW.
Learn more about Average power dissipation from :
https://brainly.com/question/32602076
#SPJ11
Microwaves of frequency 30GHz propagating in the z direction are sent through a plasma slab that is infinite in the x−y plane and 10 cm thick in the z direction. The plasma density in the slab is
N 0 =3.0×10 18 m −3 . The slab also has a magnetic field of 1.05 T oriented in the x direction. Calculate the number of wavelengths in the slab if the impinging waves have electric fields oriented in (a) the x direction and (b) the y direction.
Answers
The number of wavelengths in the slab when the electric fields are oriented in the x direction is 10.
To calculate the number of wavelengths in the plasma slab, we can use the formula:
Number of wavelengths = Thickness of the slab / Wavelength
First, let's find the wavelength using the formula:
Wavelength = Speed of light / Frequency
The speed of light is approximately 3 × 10^8 m/s.
(a) When the electric fields are oriented in the x direction:
Frequency = 30 GHz = 30 × 10^9 Hz
Wavelength = (3 × 10^8 m/s) / (30 × 10^9 Hz)
= 0.01 meters
= 1 cm
Thickness of the slab = 10 cm
Number of wavelengths = 10 cm / 1 cm
= 10
(b) When the electric fields are oriented in the y direction:
The presence of the magnetic field affects the propagation of electromagnetic waves. In this case, the wave becomes elliptically polarized. Therefore, we cannot directly use the same formula as above to calculate the number of wavelengths.
If the magnetic field were absent, we could still use the same formula, but the wave would propagate with a phase velocity different from the group velocity, leading to a different effective wavelength. However, in the presence of a magnetic field, the wave becomes more complicated, and the effective wavelength is no longer a simple value.
Without additional information, we cannot determine the number of wavelengths when the electric fields are oriented in the y direction.
Learn more about wavelengths -
brainly.com/question/10750459
#SPJ11
HURRY URGENT ASAP I WILL GIVE BRAINLIEST
What does mutate mean?
a)Change the DNA of your cells
b) Kill your DNA
c)Kill your cell
d)Change the cell
Answers
Answer:
A
Explanation:
consider the following circuit: (a) find the effective resistance of the circuit. (b) suppose the 3w resistor has a voltage difference of 6v across it. what is the value for the current through each of the resistors? (c) what is the value of the battery voltage? (d) calculate the total power dissipated by the circuit.
Answers
The total power dissipated by the circuit is 36W. We can solve this circuit using a combination of Ohm's Law and Kirchhoff's Laws.
(a) To find the effective resistance of the circuit, we can first simplify the circuit by combining the two parallel resistors:
1/Req = 1/2Ω + 1/3Ω
1/Req = 5/6Ω
Req = 6/5Ω
Now, we can combine the two series resistors with Req: Req_tot = 6/5Ω + 4Ω = 14/5Ω
Therefore, the effective resistance of the circuit is 14/5Ω, or 2.8Ω.
(b) Using Ohm's Law, we can find the current through each resistor if we know the voltage across it. Since the 3Ω resistor has a voltage difference of 6V across it, the current through it is:
I = V/R = 6V/3Ω = 2A
Using Kirchhoff's Current Law (KCL), we know that the current through the 2Ω resistor is the same as the current through the 3Ω resistor. Therefore, the current through the 2Ω resistor is also 2A.
(c) Using Kirchhoff's Voltage Law (KVL), we know that the sum of the voltage drops across each resistor must be equal to the battery voltage. Therefore, we can calculate the battery voltage by adding the voltage drops across each resistor: V_battery = V_2Ω + V_3Ω + V_4Ω
We know the current through each resistor, so we can use Ohm's Law to calculate the voltage drop across each resistor:
V_2Ω = IR = (2A)(2Ω) = 4V
V_3Ω = IR = (2A)(3Ω) = 6V
V_4Ω = IR = (2A)(4Ω) = 8V
Substituting these values, we get:
V_battery = 4V + 6V + 8V = 18V
Therefore, the battery voltage is 18V.
(d) To calculate the total power dissipated by the circuit, we can use the formula:
P = IV
We know the current through each resistor, so we can use Ohm's Law to calculate the voltage drop across each resistor, and then use the formula above to calculate the power dissipated by each resistor:
P_2Ω = (2A)(4V) = 8W
P_3Ω = (2A)(6V) = 12W
P_4Ω = (2A)(8V) = 16W
The total power dissipated by the circuit is the sum of the power dissipated by each resistor:
P_tot = P_2Ω + P_3Ω + P_4Ω = 8W + 12W + 16W = 36W
Therefore, the total power dissipated by the circuit is 36W.
To learn more about Ohm's Law here:
https://brainly.com/question/1247379
#SPJ11
True or false. When populations do not exceed their environment carrying capacity biology communities are stable?
Answers
True
Explanation:
Biology communities are stable when populations do not exceed their environments carrying capacity. Their communities are also stable when the resources for survival are sustained.
Answer:
True
Explanation:
The temperature of boiling water cannot be measured by alcohol
thermometer.
Answers
Answer:
It can be measured by using laboratory thermometer.
what is the root-mean-square voltage vrms of the source?
Answers
The root-mean-square (rms) voltage (Vrms) of a source is the effective voltage value that corresponds to the average power delivered by the source.
To determine the rms voltage of a source, you need to have the values of the instantaneous voltage over a complete cycle of the AC waveform. By squaring each instantaneous voltage value, calculating their average, and taking the square root of the result, you can find the rms voltage.
For example, if you have a sinusoidal AC voltage waveform with a peak voltage of Vpeak, the rms voltage (Vrms) can be calculated using the following formula:
Vrms = Vpeak / √2
Here, √2 is a constant value derived from the mathematical properties of sinusoidal waveforms.
The rms voltage is essential because it represents the equivalent steady DC voltage that would produce the same power or heating effect in a resistive circuit. It is commonly used to describe the voltage levels of AC power sources, electrical signals, and the voltage requirements of electrical devices.
To learn more about voltage, Click here: brainly.com/question/12017821?
#SPJ11
If a series circuit has two loads of 8 ohms and 4 ohms what do you know about their voltage drops.
Answers
The voltage drops will have the ratio of 2 : 1
Assuming the loads have the same power factor, the voltage drop will be proportional to the load impedance. The loads have a ratio of 8 : 4, 2 : 1, so the voltage drops will have a ratio of 2 : 1
What is voltage drop ?Voltage drop is the reduction in electrical potential along an electrical current's path in a circuit. Because some of the energy supplied is lost, voltage drops in the source's internal resistance, across conductors, across contacts, and across connectors are undesirable.
Learn more about Voltage here:
https://brainly.com/question/1176850
#SPJ4
Please help me on my test :) thank uu
An insulated copper wire is wrapped around an iron nail and connected to a power
source (battery). When the circuit is closed, the nail can attract and pick up paper clips,
but when the circuit is open, the nail does not attract the paper clips. Which of the
following explanations best describes this phenomenon?
A When the circuit is open, it creates a current, and a magnetic field is induced.
B When the circuit is closed, there is neither a current nor a magnetic field.
C When the circuit is closed, it creates a current, and a magnetic field is induced.
D When the circuit is open, there is a current but no magnetic field.
Answers
Answer:
d
Explanation:
because ik igvddhh56yfdsaw66 u77rfgtd gyy f music nutren
How should you check that the spring brakes come on when air pressure in the system drops below a certain level?
Answers
To check that the spring brakes come on when air pressure in the system drops below a certain level, you can perform a leakage test. This involves shutting off the engine and building up air pressure in the system.
Once the pressure has reached its maximum in system, turn off the supply valve and time how long it takes for the pressure to drop to a certain level (usually 20-30 psi). If the spring brakes engage within the allotted time, then they are functioning properly. If not, there may be a leak in the system or a malfunctioning component that needs to be addressed. It is important to regularly check air pressure in the system and perform necessary maintenance to ensure safe operation of the vehicle.
1. Park the vehicle on a level surface and chock the wheels to ensure safety. 2. Start the engine and build up air pressure in the system to its normal operating range. 3. Turn off the engine, and slowly release the air pressure from the system by pressing the brake pedal or using a controlled air pressure release valve. 4. Observe the spring brakes, and as the air pressure drops below a certain level (usually around 20-45 psi), they should automatically engage to prevent the vehicle from moving.
Learn more about system here
https://brainly.com/question/29667751
#SPJ11
A boy on his skateboard is accelerating at a rate of 5 m/s2 and has a mass of 40kg. How much force does the boy on his skateboard have?
Answers
Answer:
The answer is 200 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 40 × 5
We have the final answer as
200 NHope this helps you
A light ray has an angle of incidence of 34º. The reflected ray will make what angle with the reflecting surface?
Answers
Answer:
Angle of incidence = Angle of Reflection
34° = Angle of Reflection
So, Angle of Reflection is equal to 34°
hope it helps!
Answer: 56 degrees
Explanation:
The angle of incidence is equal to the angle of reflection, but it is not asking us for the angle of reflection. It is asking us for the angle with the reflected SURFACE. It is 90-34= 56. Look at the pic attached if you need a labelled diagram
"What is a light-year? A. The distance travelled by light in one year (365 % days) B. The distance travelled by light in a leap year (366 years) C. The time required for light to cover 1 AU of distance travelled D. The time required for light to make a round trip from a nearby star "
Answers
A light-year is the distance that light travels in a year and is approximately equal to 9.46 trillion kilometres or 5.88 trillion miles.
The distance travelled by light in one year (365 days). A light-year is a way to measure distance in space. The distance that light can travel in one year, which is approximately 5.88 trillion miles (9.46 trillion kilometres), is referred to as a light-year. The reason light-years are utilized as a measurement of distance in space is that distances in space are vast, making miles or kilometres inadequate.
The speed of light is approximately 186,000 miles per second (299,792 kilometres per second). When you multiply that by the number of seconds in a year (31,536,000), you get 5.88 trillion miles or 9.46 trillion kilometres. Therefore, the distance travelled by light in one year (365 days) is a light-year.
A leap year, which happens every four years, adds an extra day to the year, making it 366 days long. However, this does not have an impact on the definition of a light-year as a unit of distance, thus choice B is incorrect. C and D are incorrect because a light-year does not measure time but instead measures distance.
Learn more about light-year from the given link
https://brainly.com/question/76984
#SPJ11
If a train approaches you (sitting in the bench ) at a velocity of 35 m/s, what frequency will you hear as it sounds its whistle at 188 Hz? speed of sound= 345 m/sA) 188 HzB) 170.7 HzC) 209.2 HzD) 202.7 Hz
Answers
Given:
The speed of the train is,
\(v_s=35\text{ m/s}\)The actual frequency of the whistle is,
\(f=188\text{ Hz}\)The speed of sound in air is,
\(v=345\text{ m/s}\)To find:
The frequency heard by the observer
Explanation:
The apparent frequency when the train approaches the observer is given by,
\(\begin{gathered} f_{apparent}=f\frac{v}{v-v_s} \\ =188\times\frac{345}{345-35} \\ =188\times\frac{345}{310} \\ =209.2\text{ Hz} \end{gathered}\)Hence, the frequency heard by you is 209.2 Hz.