In which of the following situations is the Doppler effect absent?

Answers

Answer 1
The source and the observer are moving towards each other. The observer is moving toward the source. The source is moving away from the observer

Related Questions

the series circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?
Series circuit
A. The remaining lights would go out.
B. The remaining lights would shine with the same brightness.
C. The remaining lights would shine less brightly.
D. The remaining lights would get brighter.
Answer: A) The remaining lights would go out.

Answers

Answer:

The remaining lights would shine with the same brightness.

Explanation:

Answer:

A. The remaining lights would go out.

Explanation:

I included proof that A is the right answer. Hope this helps!

Bajo la acción del viento una puerta gira un ángulo de 90° en 5 s. Calcular su velocidad angular y la velocidad lineal de los puntos del borde
si el ancho de la puerta es de 50 cm. R. 0,314 rad/s, 0,157 m/s.

Answers

Ask Siri or goggle u get all answers from their

2. Before 0.5-kg ball is dropped from a third story window 20 m above the sidewalk. What is the potential
energy of the ball?
a. 4 J
b. 9800 J
C. 98 J
d. 150 J

Answers

Answer:

C

Explanation:

C

20*9.8*0.5

98

(C). Pe=mgh
Pe=(.5kg)(10m/s^2)(20m)
Pe= 100J≈ 98J using 9.8 for G

Three 20.0 ohm resistors are
connected in parallel. What is their
equivalent resistance?
(Unit = ohm)

Answers

Answer:

6.67 ohm

Explanation:

From the question given above, the following data were obtained:

Resistor 1 (R₁) =20 ohm

Resistor 2 (R₂) = 20 ohm

Resistor 3 (R₃) = 20 ohm

Equivalent Resistance (R) =?

Since the resistors are arranged in parallel connection, the equivalent resistance can be obtained as follow:

1/R = 1/R₁ + 1/R₂ + 1/R₃

1/R = 1/20 + 1/20 + 1/20

1/R = (1 + 1 + 1) / 20

1/R = 3/20

Invert

R = 20/3

R = 6.67 ohm

Therefore, the equivalent resistance is 6.67 ohm.

Una rueda gira 160 veces en 20[s]. Calcule su periodo (s) y frecuencia (Hz)

Answers

Answer:

Una rueda de 20 cm de radio gira de modo que en dos minutos ... Datos: • Radio 20 cm = 0,2 m • Tiempo = 2 min 30 s= 150 s • N° de vueltas ... m • f = 300 rpm = 5 Hz • Período • T = 1 f = 1 5 = 0,2 s • Rapidez angular ... 160 rpm (frecuencia de la rueda 2) • 10 * 160 = 80 * y donde y = 20 rpm

Explanation:

What are results from High Blood pressure?

Answers

Answer:

Explanation:

It can cause  damage to the blood vessels.  It Can cause  heart failure, vision loss, stroke, kidney disease, and other health problems.

Hope this helps!!!

A 5kg block is pulled across the table by a force of 61N. Calculate the acceleration of the object.

Answers

Answer:

a = 12.2 m/s²

Explanation:

Given: 5 kg, 61N

To find: Acceleration (a)

Solution:

A = F ÷ m

= 61 ÷  5  

= 12.2 m/s²

Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.

1. The distance between two identical parts of a transverse wave is the

Answers

yup i agree with the other person

A Cathode of initial mass 10.00g weigh to 10.05g
after a Current of SA passes through the voltmeter of 10 minutes - Calculate the E.C.E of the metal deposed

Answers

Answer:

i'm sorry i'm not a physics student

A student investigated

Answers

Investigation, examination, inquiry, research express the idea of an active effort to find out something. An investigation is a systematic, minute, and thorough attempt to learn the facts about something complex or hidden; it is often formal and official: an investigation of a bank failure.

Answer asap! No links or weird answers pls. Thank you

An object with a mass of 5.4 kg has a force of 20.0 Newton’s applied to it. What is the resulting acceleration?

Answers

Answer:

Mass (m) = 5.4 kg

Force (f) = 20 N

Acceleration (a) = ?

Acceleration= m × a

[tex]m \times a \\ = 5.4 \times 20 \\ = 108 \: ms ^{ - 2} [/tex]

=> The resulting acceleration of the object is 108 m/.

Erosion and Weathering can cause changes in earths surface but how does erosion alone changes the earth surface.

Answers

Answer:

The action of erosion alone can change the earth's surface. Erosion can wash away nutrients on the earth's surface, change the appearance of the soil of a particular area over time, can bore holes, that form caves, change landscapes for example when the earth is hit with gully erosion by continuous water runoff over time. Erosion can move soil to a new area.

Explanation:

Weathering involves breaking down rock into smaller pieces without any form of formal movement of those broken rock pieces. These processes that can lead to weathering are caused by mechanical, chemical, and organic processes which can happen over time. Erosion can now move broken rock pieces or soil to another place by water or wind. Weathering and erosion constantly change the Earth's surface.

What words go in the missing blanks?

An object with less ____ and ____. Will be easier to move.

Answers

I would say mass, and weight.

Which of the following vehicles has the most kinetic energy? A. a 300kg motorcycle traveling 60km/h B. a 1,100kg car traveling 60km/h C. a 900kg car traveling 80km/h D. a 2000kg truck traveling 50km/h​

Answers

Explanation:

Kinetic energy of an object is given by :

[tex]E=\dfrac{1}{2}mv^2[/tex]

Where

m is mass and v is velocity of the object

A. Mass, m = 300 kg.

Speed, v = 60 km/h = 16.67 m/s

[tex]E=\dfrac{1}{2}\times 300\times 16.67^2\\\\=41683.33\ J[/tex]

B. Mass, m = 1100 kg.

Speed, v = 60 km/h = 16.67 m/s

[tex]E=\dfrac{1}{2}\times 1100\times 16.67^2\\\\=152838.89\ J[/tex]

C. Mass, m = 900 kg.

Speed, v = 80 km/h = 22.22 m/s

[tex]E=\dfrac{1}{2}\times 900\times 22.22^2\\\\=222177.78\ J[/tex]

D. Mass, m = 2000 kg.

Speed, v = 50 km/h = 13.88 m/s

[tex]E=\dfrac{1}{2}\times 2000\times 13.88^2\\\\=192654.4\ J[/tex]

The kinetic energy in case C is maximum.

Can someone please, please help me out here? I understand literally none of this, despite watching multiple videos and reading a few articles on Kirchoff's laws.

Answers

Answer:

Explanation:

By Kirchoff's laws, I1 + I2 = 3

I2 = 3 - I1

Following circuit on the left, V = summation of IRs

9 = I1*3 + 3*2

3*I1 = 9 - 6 = 3

I1 = 1A

I2 = 3 -1 = 2A

Following circuit on the right, V = summation of IRs

ε = I2*4.5 + 3*2

= 2*4.5 + 6

= 15V

What is the potential energy of a ball that weighs 3kg and is at a height of 3m from the ground?

Answers

Answer:

88.2 J (I put 10kg instead of 3kg last time oops)

Explanation:

https://www.calculatorsoup.com/calculators/physics/gravitational-potential.php

Answer:

[tex]\boxed {\boxed {\sf 88.2 \ Joules}}[/tex]

Explanation:

Potential energy is energy due to position. It is the product of the object's mass, height, and the gravitational acceleration.

[tex]E_p= m \times \ g \times h[/tex]

The mass of the ball is 3 kilograms and the height is 3 meters. Assuming this is on Earth, the gravitational acceleration is 9.8 meters per square second.

m= 3 kg g= 9.8 m/s²h=3 m

Substitute these values into the formula.

[tex]E_p= 3 \ kg \times 9.8 \ m/s^2 \times 3 \ m[/tex]

Multiply the first two numbers.

[tex]E_p=29.4 \ kg*m/s^2 \times 3 \ m[/tex]

Multiply again.

[tex]E_p= 88.2 \ kg*m^2/s^2[/tex]

1 kilogram square meter per square second is equal to 1 Joule. Our answer of 88.2 kg*m²/s² is equal to 88.2 Joules

[tex]E_p= 88.2 \ J[/tex]

The ball has 88.2 Joules of potential energy.

5. What is the name of the Scientist who began classification?
O Carl Linnaeus
O Albert Einstein
Sir Issac Newton

Answers

Answer:

Carl Linnaeus discovered Classification

Answer:

Carl Linnaeus

Explanation:

Mark me Brainllest

While performing a stunt, Danger Dog rides his motorcycle off the edge of a cliff with a velocity of 32 m/s. If the cliff is 45 m high, how far from the base of the cliff will Danger Dog land? Enter your answer in meters. 11 m 96 m 288 m 4 m

Answers

Answer:

The correct answer is b: 96 m.

Explanation:

The total distance in the horizontal direction traveled by Danger Dog can be calculated using the following equation:

[tex] x_{f} = x_{0} + v_{0_{x}}t + \frac{1}{2}at^{2} [/tex]   (1)

Where:

[tex] x_{f}[/tex]: is the final position in the horizontal direction =?                                      

[tex]x_{0}[/tex]: is the initial position in the horizontal direction = 0                                      

[tex] v_{0_{x}} [/tex]: is the initial velocity in the horizontal direction = 32 m/s

t: is the time

a: is the acceleration = 0 (he is accelerated only by gravity)

So, we need to find the time. We can find it as follows:

[tex] y_{f} = y_{0} + v_{0_{y}}t - \frac{1}{2}gt^{2} [/tex]    (2)

Where:

[tex] y_{f}[/tex]: is the final position in the vertical direction = 0                                      

[tex]y_{0}[/tex]: is the initial position in the vertical direction = 45 m                                      

[tex] v_{0_{y}} [/tex]: is the initial velocity in the vertical direction = 0

g: is the acceleration due to gravity = 10 m/s²      

By solving equation (2) for "t" we have:

[tex] t = \sqrt{\frac{2(y_{0} - y_{f})}{g}} = \sqrt{\frac{2*45 m}{10 m/s^{2}}} = 3 s [/tex]

Hence, the total distance traveled by Danger Dog in the x-direction is (equation 1):

[tex] x_{f} = 32 m/s*3 s = 96 m [/tex]    

Therefore, the correct answer is b: 96 m.

I hope it helps you!

A roller coaster speeding down a hill is an example of
A. Increasing kinetic energy
B. Increasing nuclear energy
C. All of these choices
D. Increasing in potential energy

Answers

Answer:

If I'm not wrong; I think the answer is A

Explanation:

A. Increasing kinetic energy

1 hp is equal to? What is the answer​

Answers

The electrical equivalent of one horsepower is 746 watts in the International System of Units (SI), and the heat equivalent is 2,545 BTU (British Thermal Units) per hour. Another unit of power is the metric horsepower, which equals 4,500 kilogram-metres per minute (32,549 foot-pounds per minute), or 0.9863 horsepower.

Need some physics gel pls

Answers

Don’t trust these people that give you these files to click on it doesn’t work and it’s a scam stay safe!

Which device requires an electric power supply?
A. A motor
B. A generator
C. A turbine
O D. A permanent magnet

Answers

Answer:

A. A motor

Explanation:

The diagrams show two planets of different masses with identical orbiting satellites. Select all the conditions that would increase the gravitational force between each pair.
A. move the satellites closer to the planet
B. move the satellites farther from the planet
C. Add mass to the satellites
D.Remove mass from the satellites

Answers

Answer:

C I think but I'm not sure

Explanation:

Because by adding mass it would add more gravitational pull

what is frictional less pulley​

Answers

Answer:

Conditions under which the belt and pulleys are operating – The friction between the belt and pulley may decrease substantially if the belt happens to be muddy or wet, as it may act as a lubricant between the surfaces.

Explanation:

I hope that this would be helpful

ASAPPPPP NO LINKS PLSSSS *FOR TEST TOMORROW*
Meanings for:
- Automation
- Fulcrum
- Consumerism

Answers

Automation:

1. The creation and application of technology to monitor and control the production and delivery of products and services.

2. The use of machines and technology to make processes run on their own without manpower.

Examples to make you understand better:

Automations are in Meetings, Hiring Process, Employee Analytics.

Quote:

"In manufacturing, a system or method in which many or all of the processes of production, movement, and inspection of parts and materials are automatically performed or controlled by self-operating machinery, electronic devices, etc."

Fulcrum:

Picture Included.

1. The support about which a lever turns

2.The support or point of support on which a lever turns in raising or moving something

Consumerism:

Quote:

"Consumerism has a good and bad side. Although consumerism drives economic growth and boosts innovation, it comes with a fair share of problems ranging from environmental and moral degradation to higher debt levels and mental health problems."

Definition:

1. "The growth of consumerism has led to many organizations improving their service to the customer"

2. Spending money and consuming goods is good for the economy.

3. The protection or promotion of the interests of consumers.

I hope this helped!+*♡

A 50,000 kg train is rolling on its own down the track at 5 m/s. You grab the rope trailing behind it, and exert a stopping force of 2000 N. How long does it take to stop the train?

Answers

Answer:

t = 125 seconds

Explanation:

Given that,

The mass of a train, m = 50,000 kg

Initial speed, u = 5 m/s

Stopping force, F = 2000 N

We know that,

Force, F = ma

Where

a is acceleration

[tex]F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{50000(0-5)}{-2000}\\\\t=125\ s[/tex]

So, it will take 125 seconds to stop the car.

Which of these statements explains why we have day and night? [1] The Earth orbits the Sun once a day The Sun orbits the Earth once a day. The Sun spins on its axis once a day. The Earth spins on its axis once a day.

Answers

Answer:

The Earth spins on its axis once a day.

Explanation:

In simple words,The Earth revolves on its axis once every 24 hours and circles the sun once every 365 days. The Earth's rotation on its axis, not its orbit throughout the sun causes day as well as night. The word 'one day' refers to the period it requires the Earth to spin entirely on its axis, which involves both day as well as night.


A sound wave is called a longitudinal wave? why?Give reason

Answers

Answer:

A sound wave is called a longitudinal wave because compressions and rarefactions in the air produce it. The air particles vibrate parallel to the direction of propagation.

A rollercoaster cart that has a mass of 4500 kg has 67.5 kJ (kilojoules), or 67,500 J (joules), of gravitational potential
energy. What is its height above the ground?
PT.2
The same 4500 kg rollercoaster cart is moving with 63.0 kJ (kilojoules), or 63,000 J (joules), of kinetic energy at the
bottom of its biggest hill. What is its velocity?

Answers

Answer: The height of rollercoaster cart above the ground is 1.53 m.

The velocity of rollercoaster cart is 5.29 m/s.

Explanation:

Potential energy is the energy occupied by a substance due to its position. Formula for potential energy is as follows.

P.E = mgh

where,

m = mass of substance

g = gravitational constant = [tex]9.8 m/s^{2}[/tex]

h = height

Substitute the values into above formula as follows.

[tex]P.E = m \times g \times h\\67500 J = 4500 kg \times 9.8 m/s^{2} \times h\\h = \frac{67500 J}{4500 kg \times 9.8 m/s^{2}}\\= 1.53 m[/tex]

Hence, the height of rollercoaster cart above the ground is 1.53 m.

Kinetic energy is the energy occupied by the motion of a substance. Formula for kinetic energy is as follows.

[tex]K.E = \frac{1}{2}m \times v^{2}[/tex]

where,

m = mass of substance

v = velocity of substance

Substitute the values into above formula as follows.

[tex]K.E = \frac{1}{2}m \times v^{2}\\63000 J = \frac{1}{2} \times 4500 kg \times v^{2}\\v^{2} = \frac{63000 J \times 2}{4500 kg}\\v = 5.29 m/s[/tex]

Hence, the velocity of rollercoaster cart is 5.29 m/s.

The Voltmeter reads 16 V. The ammeter reads 0.25 A. The resistance must be

Answers

Answer:

64 ohms =R

Explanation:

R is directly proportional to V

R is inversely proportional to I(Current

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