Answer: V = 15 m/s
Explanation:
As stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. The observed frequency the car will be experiencing will be addition of the two frequency. That is,
F = 2.1 × 10^10 + 1030 = 2.100000103×10^10Hz
Using doppler effect formula
F = C/ ( C - V) × f
Where
F = observed frequency
f = source frequency
C = speed of light = 3×10^8
V = speed of the car
Substitute all the parameters into the formula
2.100000103×10^10 = 3×10^8/(3×10^8 -V) × 2.1×10^10
2.100000103×10^10/2.1×10^10 = 3×108/(3×10^8 - V)
1.000000049 = 3×10^8/(3×10^8 - V)
Cross multiply
300000014.7 - 1.000000049V = 3×10^8
Collect the like terms
1.000000049V = 14.71429
Make V the subject of formula
V = 14.71429/1.000000049
V = 14.7 m/s
The speed of the car is 15 m/s approximately
Answer: 7.36m/s
Explanation:
(Fo- f)/fo = 2v/c
1030/2.10 x 10^10 = 2v/ 3 x 10^10
4.905= 2v/3 x 10^10
Rearrange for v
V = ((1030/2.10 x 10^10) x (3x 10^10)) / 2
V = 7.36 ( right for acellus)
Complete the sentences to describe the postulates of Einstein’s special theory of relativity.
Einstein’s special theory of relativity has two postulates.
The first postulate states that the laws of physics are the
answer: same
in all uniformly moving reference frames.
The second postulate states that the speed of light in a vacuum has the same value for all
answer: observers
, regardless of the state of
answer: motion of the observer or the source of light.
I am posting for others... feel free to take the points
Answer:
awwh thanks for the free points
The special relativity hypothesis is accepted by all physicists. Even our satellites in orbit must synchronize their clocks and transmissions with those on Earth using Einstein's calculations.
What Einstein’s special theory of relativity?According to special relativity, speed has an impact on space, time, and mass. Small amounts of mass (m) can be interchangeable with vast amounts of energy (E), as indicated by the classic equation E = mc2. This method of defining the link between energy and matter is included in the theory.
Therefore, The relationship between speed, mass, time, and space is described by Einstein's special relativity theory. It describes the equation e=mc2, which asserts that energy is equal to mass times the square of the speed of light.
Learn more about Einstein’s here:
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The reflection of a 10.0 cm object appears to be 18 cm tall and 9 cm behind the mirror.
What distance is the object from the mirror?
cm
Answer: 5cm
Explanation:
Given the following :
Image height = 18cm
Object height = 10cm
u = object distance
v = image distance = 9 cm
Using the relation:
image height/object height= v/u
18/10 = 9/u
Cross multiply
18 × u = 10 × 9
18u = 90
u = 90/18
u = 5cm
Therefore,
Object distance from mirror = 5cm
Answer:
5 cm
Explanation:
correct on edge 2020/2021
A frictionless roller coaster (22kg) is at a height h traveling with a speed v0 = 10m / s. Assume that h = 20m. The speed of the car at point B is:
Answer:
3 g
Explanation:
Four identical 2.5 mF capacitors are connected together electrically. What is the greatest possible capacitance of the combination? 0.50 mF, 0.42 mF, 0.63 mF, 10 mF, or 0.40 mF?
When capacitors are in PARALLEL, they add up. (like resistors in series)
If you connect these four capacitors in parallel, the combination behaves like a single capacitor of (4 x 2.5) = 10 mF.
That's the greatest capacitance you can make with these four pieces.
GIVING BRAINIEST TO CORRECT ANSWER
If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
Answer:
Explanation:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
The diagram shows the scales used for recording
temperatures. The labels for the scales are missing.
W
х
Y
Water
boils
212
100
373
-
Which labels complete the diagram?
W: Fahrenheit
X: Celsius
Y: Kelvin
OW: Kelvin
X: Celsius
Y: Fahrenheit
W: Celsius
X:Fahrenheit
Y: Kelvin
W:Celsius
X. Kelvin
Y. Fahrenheit
Water
freezes
_32
02
273
-273
Absolute 460
zero
Answer:
A.
W: Fahrenheit
X: Celsius
Y: Kelvin
Explanation:
this is correct, I took the test on edge.
The scales W X Y in that order are; Fahrenheit, Celsius and Kelvin.
What is a temperature scale?The temperature scales essentially provide a basis for the measurement of temperature. The three main temperature scales are; Fahrenheit, Celsius and Kelvin. The Kelvin is called the absolute scale.
Given the values of the boling points of water, the scales W X Y in that order are; Fahrenheit, Celsius and Kelvin.
Learn more aout temperature sclaes: https://brainly.com/question/10095561
An airplane flies 40km directly south in 10 minutes and 20 km directly east in five minutes, its average speed is:
a)2.98km/min
b)2km/min
c)8km/min
d)4km/min
Answer:
D. 4km/min
Explanation:
Since the question deals with "speed" and not "velocity", the direction does not matter.
the plane covers 40 + 20 km=60km in 10mins +5 mins=15mins
60 km - 15 mins
1min- 60÷15= 4 mins
therefore, your answer is D. 4km/min
In the table below, which statement would best fill the missing box under “Closed System”? Open System Closed System Matter freely moves Matter does not freely move Energy freely moves Energy is unknown Energy is destroyed Energy does not freely move Energy freely moves
Answer:
energy moves freely
just guessing
Answer:
C: Energy does NOT move freely
Explanation:
a closed system does not allow energy to flow, open systems do.
Which statements accurately describe the motion map?
Check all that apply.
-The objects are moving in the same direction
-The objects are moving in opposite directions.
-Object A has a greater velocity than object B.
-Object B has a greater velocity than object A.
-Objects A and B have the same velocity
Answer: B & D
Explanation:
The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
It is a vector quantity to be displaced. This means that it is visually represented as an arrow that points from the starting position to the ending position and that it has both a direction and a magnitude.
The total distance traveled by an object is different than the total displacement covered by it because the displacement is a vector quantity and it is calculated on the basis of the shortest distance traveled by the body or object.
Thus, The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B
Learn more about displacement here
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Steroid use in females can cause masculine characteristics, such as lower voice and increased body hair." True False
Answer:
True
Explanation:
Side affects can range from
Problems with periods to Loss of breasts
On February 6, 1971, Alan Shepard made history by becoming the first astronaut to play golf on the Moon. Using only one hand to swing the club because of his bulky space suit, Shepard still managed a long drive. Given the lack of an atmosphere on the moon and a gravitational acceleration of 1.6 m/s2, how far would the shot go with an initial velocity of 25 m/s and a launch angle of 35∘?
A. 367 m
B. 375 m
C. 382 m
D. 391 m
Answer:
Horizontal distance travelled by the ball.
A. 367m
Explanation:
Projectile motion is a motion in which an object moves in a parabolic path due to the action of gravity on it. Projectile motion only occurs when there is one force which is applied at the beginning, after that the only interference is from gravity. e.g the path of a golf ball after hit by a golfer.
Range of the projectile can be defined as the horizontal distance given by the ball. We need to find Range in this question.
The Range of a projectile is given by:
[tex]R = \frac{v^2\cdot{sin2}\theta}{g}[/tex]
where
v = initial velocity = 25 m/s
θ = 35°
g = 1.6 m/s²
Substitute the values in formula of R:
[tex]R= \frac{(25)^2\cdot{sin(2\cdot35)}}{1.6}\\R= \frac{(625)\cdot{sin(70)}}{1.6}\\R=367m[/tex]
A tungsten-filament lightbulb emits light based on the temperature of the
filament. Which phenomenon does this demonstrate?
A. Photoelectric effect
B. Blackbody radiation
C. Quantum mechanics
D. Emission spectra
Which of the following is the most effective relaxation technique?
A.
It varies from person to person.
B.
Deep breathing
C.
Eating right
D.
Exercising
Answer:
A
Explanation:
It varies from person to person.
Answer:
A.
It varies from person to person.
Explanation:
i just look the test
What is the average temperature of the city, 89.6 Fahrenheit, on the Celsius scale?
Answer:
thrity-two degrees Celsius
NEED HELP ASAP!!!!!!!!!!!!!
Which of the following is NOT a side effect of smoking:
Decreased ability to use oxygen
Decreased lung function
Decreased risk of heart attack
Increased asthmatic symptoms
Answer: Decreased risk of heart attack
Explanation:
thats the answer because it actually
increase rish of heart attack
Hope this helps :)
Answer:
the answer is C. It wont decrease your probability of a heart attack it will increase it
Explanation:
3. What are two common effects of driving on open highways?
A. Speeding and highway hypnosis
B. Fatigue and visual effects
C. Velocitation and fatigue
D. Velocitation and highway hypnosis
Answer:
Explanation:
Special problems: Rural areas can be twice as dangerous as their city counterparts. ... Two common effects of driving on open highways are velocitation and ... Avoid speeding on rural roads or after you exit the freeway by checking your ... for a long period of time, be aware of a condition known as "highway hypnosis".
Driving on wide highways frequently results in velocitation and tiredness. The phenomena of accidentally raising speed on roads as a result of repeated exposure to greater speeds is known as velocitation.
It happens when drivers become acclimated to the faster speeds and may unintentionally go over the speed limit, endangering their safety.
Another frequent impact is fatigue, which can occur as a result of extended lengths of repetitive driving on wide-open highways. Fatigue can make it difficult to focus, respond quickly, and make decisions, which makes accidents more likely.
Despite the fact that highway hypnosis and visual effects can also happen when driving, open roads are uniquely linked to velocitation and weariness.
To know more about velocitation :
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which of the following best describes a mathematical wave
A: A transfer of energy
B: A movement of matter
C: When energy is converted from one form to another
D: A periodic disturbance of a medium
Answer: D:
A periodic disturbance of a medium
Explanation:
A wave can be Mathematically defined by periodic disturbance of a medium. That is, oscillations of the waves about a fixed position or change in position from the resting equilibrium position. The wave oscillate from equilibrium position with amplitude periodically.
Michael is the captain of his school's soccer team. What skill does Michael exhibit when he decides which player will take the penalty kick?
A.
conflict resolution
B.
sportsmanship
OC.
leadership
D.
teamwork
PLEASE HELP <3
what is the mass of mr. thomson’s prius if his kinetic energy is 641300 J when he is driving at a velocity of 22 meters per second on the highway? please show work
Answer:
The mass of Mr. Thomson’s prius is 2650 kg.
Explanation:
We are given with, the kinetic energy of Mr. Thomson’s prius is 641300 J
He is moving with a velocity of 22 m/s
It is required to find the mass of Mr. Thomson’s prius.
Due to his motion, a kinetic energy will possess by him. The mathematical form of kinetic energy is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Solving for m
[tex]m=\dfrac{2K}{v^2}[/tex]
Plugging all the values, we get :
[tex]m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 641300}{(22)^2}\\\\m=2650\ kg[/tex]
So, the mass of Mr. Thomson’s prius is 2650 kg.
A horizontal force of 50 N is applied to the object.
Answer:
Mass of object (m) = 5.102 kg
Explanation:
Given:
Horizontal Force (F) = 50 N
Find:
Mass of object (m) = ?
Computation:
We know that, acceleration due to gravity (g) = 9.8 m/s²
⇒ Horizontal Force (F) = mg
⇒ 50 N = m (9.8 m/s²)
⇒ Mass of object (m) = 50 / 9.8
⇒ Mass of object (m) = 5.102 kg
Mass of object (m) is 5.1 kg (Approx)
What recommendations would you give to the global governments to help decrease the global effects of human impact on the environment? List 2 recommendations and how they will positively impact our planet.
Answer:
he scientific and political arguments surrounding the health of our planet can make the whole topic seem beyond the grasp of the individual. How fast is the climate changing? Exactly what effect to humans have? And what will the government do about it?
How we treat Earth also involves trillions of little decisions by billions of individuals.
That in mind, on this Earth Day, LiveScience presents 10 ideas for saving energy and otherwise cutting down on your impact on the planet. The list was compiled by the Earth Day Network organization and republished here with permission
hope this helps u stay safe
Answer:
promote green energy.
Explanation:
Explain the process by which cell phones transmit data using energy and waves
Answer:
Radio active waves
Explanation:
It transmits it by invisible waves to connect to internet or to use wireless headphones or wireless charger.
WILL GIVE BRAINIEST TO CORRECT ANSWER
Define loudness and intensity of sound. How are the two concepts related?
Answer:
Hey mate, here's ur answer
-------------------------------------------------------------
Loudness refers to how a sound seems to a listener, whether it's loud or soft.
___________________________
Intensity is the sound power per unit area. It is independent of the sensitivity of the human ears.
___________________________
The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. It is measured in decibels (dB).
___________________________
Hope this helps
#stayhomestaysafemate
:D
State the section of the graph (A, B, C, or D) where the car is moving the slowest.
Explain your answer.
b) Calculate the average speed of the car over the whole journey.
100 points and brainliest
Answer:
D 15m/s
Explanation:
1)you find the speed covered in all the points e.g on speed=distance covered
time taken
a)300m\15s=20m/s
b)rest no distance covered
c)(1000-300)=700m time=(60-35)=25. 700m/25s=28m/s
d)(1200-1000)=300m time=(80-60)=20s
200m/20s=10m/s
thus the lowest speed was 10m/s at D
Average speed=average distance
average time
=1200m/80s. =15m/s
hi:) anyone able to explain why it’s easier to lift something on moon compared to earth? thanks:)
Because the moon has much less mass than the Earth has. This makes the gravitational forces between the moon and any object much less than the forces between the Earth and the same object, when the object is the same distance from the center of the moon or the Earth.
To talk about an actual number, we usually talk about being on the surface of the Earth or the moon:
A person or object on the surface of the moon weighs about 17% as much as he/it weighs on the surface of Earth. That's about one-sixth as much. So naturally, it's easier to lift something on the moon than it is to lift the same thing on Earth, because when it's on Earth, it's about six times as heavy.
When an object rolls over a surface, the kind of friction that occurs is called
friction.
Answer here
Answer:
Rolling Friction
Explanation:
But only write rolling on the blank space
Answer:I miss her
Explanation:
A dog walks along The ground. If the dog applies an action force on the ground, what is the reaction force?
Please HELP
Explanation:
Action and reaction are two forces that are equal in magnitude but the direction is opposite.
When a dog walks along the ground, the action force is the force that dog applies on the ground. On the other hand, the reaction force is the force that the ground applies on the dog. It is based on Newton's third law of motion.
Is the Phosphorus element a metal?
Answer:
No phosphorus is not a metal.
Explanation:
Which of the following atoms has the smallest radius?
The Periodic Table
Is there gravity in space. True False
True. There IS gravity in space. Tons of it.
