When a sound enters a new medium where the sound travels faster, it means the vibration of particles is high, and the wavelength of the waves increases which means the speed of the wave has increased. The frequency on the other hand will remain constant.
How much power does it take to lift 20.0 N 5.0 m high in 5.0s?
Answer:
Explanation:
20 watts
A car with a mass of 1400 kg moves along the ice with a constant velocity of 18.0 m/s. What is the car’s momentum?
Answer:
M= mv= 1400 x 18= 25200 kg x m/s
Identify the relationship between kinetic energy and gravitational potential energy for the cyclist at each position
Answer:
follows are the responses to the given question:
Explanation:
The kinetic energy of every object moving. [tex]PK=m \times v^2[/tex] any entity lifted against the strength of gravity stores elastic potential of gravity.
[tex]PE = height \times mass \times g[/tex]
Its total power of an independent device stays constant underneath the Mass conservation on Energy and it is, the kinetic energy plus potential energy is just like a fixed [tex](KE+PE=Standard)[/tex]. So, if KE improves, it is valid that PE declines.
If the PE is now at least then KE has been at the highest. It is also valid that KE is reduced as PE is increased as well as the maximum PE, the minimum KE.
What happens to a digital signal sent using electromagnetic waves as it travels farther from its source?
Answer:
Please find the answer in the explanation
Explanation:
What happens to a digital signal sent using electromagnetic waves as it travels farther from its source?
Solution.
To transmit a signal, the analogue signal is first modulated and converted to digital signals.
The digital signals transmitted through electromagnetic waves like radio wave or microwave can experience attenuation over a long distance as they tend to pass through tissues and wall.
The frequency and the intensity of wave continue to decrease as the wave tend to propagate through the wall and tissues.
To correct this, there must be a device to amplify the signal at the strategic points.
After this, the signal will be demodulated back to the analogue signal.
Therefore, attenuation may occur as the signal tend to pass through the tissues and office walls.
Answer:
The signal becomes weaker and more difficult to detect
Explanation:
got it right on my quiz
Which of the following statements is true of gravity?
A. Gravity decreases rapidly as the distance between two objects increases, especially when considering distances between objects in space
B. Gravity is affected by the weight of two objects that attract each other and the distance between them.
C. Both A and B are correct.
D. Neither A or B is correct.
can someone help me answer the questions 1-6 please ?!
Answer:
1- when carbon dioxide concentrations rise, air temperatures go up, and more water vapor evaporates into the atmosphere—which then amplifies greenhouse heating
2-Human activities emit 60 or more times the amount of carbon dioxide released by volcanoes each year. ... In fact, several individual U.S. states emit more carbon dioxide in a year than all the volcanoes on the planet combined do. On the scale of carbon dioxide emissions, human sources far outweigh volcanoes
3-Human activities such as the burning of oil, coal and gas, as well as deforestation are the primary cause of the increased carbon dioxide concentrations in the atmosphere.
4-rising maximum temperatures.
rising minimum temperatures.
rising sea levels
your choice u can write this too (Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns)
5-It leads to a decrease of ozone, which protects the Earth from the Sun's heat. ... It includes greenhouse gases, which trap heat in the Earth's atmosphere again u can write this aswell(Global warming is primarily caused by emissions of too much carbon dioxide (CO2) and other heat-trapping gases into the atmosphere when we burn fossil fuels to generate electricity, drive our cars, and power our lives. These heat-trapping gases spread worldwide and remain in the atmosphere for decades to centuries)
6-CO2 levels are determined by the imbalance between carbon sequestration (burial in sediments, capture by plants), and carbon emissions (rock weathering and volcanic activity). Imbalances in this system created a downward trend in CO2 levels, leading to a glaciation period around 300 million years ago.
Explanation:
What is the mass of an apple with a potential energy of 8 Joules that is on a shelf that is 4 meters high?
A; 32kg
B; 15Kg
C;4kg
D:2kg
I need help asap
What is a homopolar motor?
a. The first electric motor ever made.
b. A motor made by in the North Pole.
c. A motor used in homes in the winter.
Answer: The answer is A
Explanation:
Electromagnetic waves moving through time and
space produces what type of energy?
Answer:
motion example of kinetic energy charged particle such as electrons and protons create electromagnetic field when they move in this field transport the type of energy vehicle electromagnetic radiation or light
I NEED HELP PLEASE !!!!
Find the impulse that acts on the object during the time interval 10s to 20s
Answer:
I guess it's force hope this answer helps
When does a metal atom stop reacting
Answer:
When a metal element reacts with a non-metal element an ionic compound is formed. An understanding of the way the elements are bonded allows us to explain their typical properties.
Reactions between metals and non-metals include:
sodium + chlorine → sodium chloride
magnesium + oxygen → magnesium oxide
calcium + chlorine → calcium chloride
Explanation:
In all of these reactions, the metal atoms give electrons to the non-metal atoms. The metal atoms become positive ions and the non-metal atoms become negative ions.
A metal atom often stop reacting when it has lost all of its outer electrons.
Metal atoms often have few electrons in their outer shell.
Non-metal atoms does have plenty of electrons in their outer shell.
A Metal atoms lose the electron, or electrons, when in their highest energy level and tend to be positively charged ions.
Non-metal atoms often gain an electron, or electrons, so as to be negatively charged ions.
The loss or gain of valence electrons make ions to work with the octet rule and become more stable.
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Arrange these source charges in order from least to greatest magnitude.
A. A, B, C, D
B. B, D, C, A
C. C, A, B, D
D. D, B, A, C
Answer:
option c is the right answer
Answer:
D, B, A, C
Explanation:
The more lines, the greater the charge.
How can you determine if a circuit is a series circuit or parallel circuit
Answer: A circuit is said to be a parallel circuit if the electrical components are connected in a parallel configuration or their end are connected to a common point. It forms multiple loops or pathways for the current to flow. A circuit is said to be a series circuit if the components are connected in a series configuration or cascaded formation in a single line. A series circuit forms a pathway that has only one loop, therefore, the current flowing through components is the same and the voltage divides depending on the resistance of each component.
Explanation:
Draw the currect electric lines for the following charge
what is the mass of vertical column of air that exerts pressure of 1 atm over a10m by 10m square surface
Answer:
[tex]m=1.01\times 10^6\ kg[/tex]
Explanation:
Given that,
Pressure, P = 1 atm = 101325 Pa
Area of the square surface, A = 10² = 100 m²
We need to find the mass of vertical column of air. We know that, pressure is equal to the force acting per unit area. So,
[tex]P=\dfrac{mg}{A}\\\\m=\dfrac{PA}{g}\\\\m=\dfrac{101325\times 10^2}{10}\\\\m=1.01\times 10^6\ kg[/tex]
So, the required mass of the vertical column of air is [tex]1.01\times 10^6\ kg[/tex].
What type of planets does the asteroid belt orbit?
Answer:
Main Asteroid Belt: The majority of known asteroids orbit within the asteroid belt between Mars and Jupiter, generally with not very elongated orbits. The belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 mile) in diameter, and millions of smaller ones.
Explanation:
Hi!Most of these objects, called planetoids or asteroids meaning "star-like" orbit between Mars and Jupiter in a grouping known as the Main Asteroid Belt.
What do we mean when we say that momentumis a vector
Answer:
it has both magnitude and direction.
Explanation:
I need help! anyone trynna help?
Answer:
300 pascals
Explanation:
P=F/A
P=15N/0.05
P=300 pascals
When a 0.38 kg block is suspended on a vertical spring, it causes it to stretch 3.5 cm. If the block is now pulled 7.5 cm below its equilibrium position and released, what is the speed of the block when it is 4.2 cm below the equilibrium position?
Answer:
w = 16.73 rad / s, v = - 1.04 m / s
Explanation:
This is an exercise in oscillatory motion of a system of a spring and a mass, the angular velocity is
w = [tex]\sqrt{ \frac{k}{m} }[/tex]
To calculate the spring constant we use the data that Δx = 3.5 cm = 0.035 m with a mass of m = 0.38 kg, let's write Hooke's law
F = -kx
in this case the applied force is the weight of the body
F = W
we substitute
mg = k x
k = m g / x
k = 0.38 9.8 / 0.035
k = 106.4 N / m
let's find the angular velocity
w = Ra 106.4 / 0.38
w = 16.73 rad / s
the movement of this system is described by the expression
ax = A cos (wt + Ф)
the quantity A is called the amplitude of the movement in this case A = 7.5 cm = 0.075 m
to encode the constant we use that the system is released from its position of maximum displacement (x = A)
we substitute
A = A cos (0 + Ф)
cos Ф = 1
Ф = cos-1 1
Ф = 0º
by substituting in the equation of motion
x = 0.075 cos (16.73 t)
Let's find the time it takes to reach the desired position x = 4.2 cm = 0.042 m
cos 16.73 t = 0.042 / 0.075 = 0.56
16.73 t = cos -1 0.56
remember that angles must be expressed in radians
t = 0.976 / 16.73
t = 0.0583 s
body velocity is
v = [tex]\frac{dx}{dt}[/tex]
v = -0.075 16.73 sin 16.73t
let's calculate for the time found
v = - 1.25475 sin (16.73 0.0583)
v = - 1.04 m / s
Conservation of momentum
Answer:
8.6 m/s
Explanation:
From the question,
applying law of conservation of momentum
Total momentum before collision = Total momentum after collsion
mu+m'u' = mv+m'v'....................... Equation 1
make v' the susbject of the equation
v' = (mu+m'u'-mv)/m'.................. Euqation 2
Where m = mass of the ball, m' = mass of the can, u = initial velocity of the ball, u' = initial velocity of the can, v = Final velocity of the ball, v' = final velocity of the can.
Given: m = 1.2 kg, m' = 0.7 kg, u = 14 m/s , u' = 0 m/s (at rest), v = 9 m/s.
Substitute these values into equation 2
v' = [(1.2×14)+(0.7×0)-(1.2×9)]/0.7
v' = (16.8-10.8)/0.7
v' = 6/0.7
v' = 8.6 m/s
Explain what must be true of component waves for reinforcement or interference to occur.
The answer is the component of waves must have same frequency and phase.
A dog and a cat sit on a merry-go-round. The dog sits 0.3 m from the center. The cat sits 1.5 m from the center. The whole merry-go round rotates with an angular speed of 5 rad/s. Which animal, if either, is experiencing a higher velocity? Which animal, if either, is experience a higher angular speed?
Answer:
hope that pic helps!! let me know!!
Explanation:
or this expert answers from expert
what happens inside of a star?
Answer:
In the centre of a star, the temperature and pressure are so high that four protons can fuse to form helium, in a series of steps.
Explanation:
A motorist wishes to travel 40 kilometers at an average speed of 40 km/h. During the first 20 kilometers, an average speed of 40 km/h is maintained. During the next 10 kilometers. however, the motorist averages only 20 km/h. To drive the remaining 10 kilometers and average 40 km/h, the motorist must drive
a) 60 km/h. b) 80 km/h. c) 90 km/h. d) faster than the speed of light
poste en français s’il vous plaît
A train whistle is 580 Hz when
stationary. It is moving away from
you at 18.8 m/s. What frequency
do you hear?
(Speed of sound = 343 m/s)
(Unit = Hz)
HELP PLS!!
Answer:
Did you find the answer for this?
Explanation:
Answer:
550Hz
Explanation:
Give examples to show that friction is both friend and foe ?
Answer:
friction as friend
It helps us to hold or catch any objectit alos helps us to walk easilyfriction as foe
It causes wear and tear of tyresit also cause great damages to parts of machinehope it helps
Answer:
Wear and tear of soles of our shoes is due to friction.
When a tyre deflates, it is difficult to move the vehicle because of increased friction between the tyre and the road surface.
Machines get heated up and produce noise because of friction.
Which statements best describe displacement? Check all that apply.
Displacement is measured along the path an object travels.
Displacement is a measurement that includes direction.
Displacement is the difference between a starting point and an ending point.
Displacement is how far an object travels from starting point to ending point.
Displacement is measured as a straight line between a starting point and an ending point.
Pls help,Will mark brainliest if correct :)
Answer:
the last one, the third one, and the first one.
Answer:
Displacement is a measurement that includes direction, displacement is the difference between a starting point and an ending point, and displacement is measured as a straight line between a starting point and an ending point.
Explanation:
A car travels 52 mph for 6 minutes, 46 mph for 3 minutes, 40 mph for the remaining time during a 30 minute journey. find the total distance travelled
Answer:
21.5 miles
Explanation:
Distance = Speed * time
Distance traveled in first 6 minutes = 52 * [tex]\frac{6}{60}[/tex] = 5.2 miles
Distance traveled in next 3 minutes = 46 *[tex]\frac{3}{60}[/tex] = 2.3 miles
Remaining minutes = 30 - 6 -3 = 21 minutes
Distance traveled in 21 minutes = 40 * [tex]\frac{21}{60}[/tex] = 14 miles
Total distance traveled = 5.2 + 2.3 + 14 = 21.5 miles
all of the following describe the motion of an object except
mass
speed
velocity
acceleration
Which two factors affect the electric force between two particles?
A. Gravitational force
B. The strong nuclear force
C. Their charges
D. The distance between them
E. Their mass
Answer:
A. Gravitational force
C. Their charges
Explanation:
As we'll discuss in this lesson, he found that the force between charged particles was dependent on only two factors: the distance between the particles and the amount of electric charge that they carried.
Hope it help you
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