Responda:
1 metro
Explicação:
Dado que :
Tempo de reação = 0,2 segundos
Velocidade de deslocamento = 5 m / s
A distância percorrida antes da frenagem pode ser obtida usando a relação:
Distância = velocidade de viagem * tempo de reação
Distância percorrida antes da frenagem = (5 m / s) * (0,2s)
Distância percorrida antes da frenagem = 1 metro
11. A ball is thrown up and attains maximum height of 20 m. Calculate its initial speed. (g = 10 ms')
a) 19.7 m/s
b) 20 m/s
c) 25 m/s
d) 35m/s
final velocity = 0
acceleration = - 10 m/ s 2
distance. = 20 m
u = ?
v^2 - u ^2 = 2 a s
0^2 - u^ 2 = 2 * -10 * 20
-u^2 = -400
u = √ 400
u = 20m / s
an object has a weight on the surface of the earth of 370 N. What is the mass
Explanation:
The mass of the object is 370N / (9.81N/kg) = 37.7kg.
why is the horizontal component of a velocity remains constant in horizontal and inclined projection
Answer:
This is because there is no acceleration in the horizontal direction
Explanation:
This is because, the only acceleration affecting the object in horizontal and inclined projection is the acceleration due to gravity, which is directed the vertical downward direction. There is a velocity change only in the vertical direction and none in the horizontal direction because, there is no acceleration in the horizontal direction. So, its velocity remains constant.
Which of the following is true about sound waves?
1:they move faster than light
2:they make wind
3:the vibrate the air
4: they move slower in water than air
Answer:
They transmit by vibration through mediums such as air. So #3 is most logical answer.
Explanation:
It is in fact vibration of air (sound waves) which is transformed by the tympanic membrane in the ear of human to audible sounds.
++++++++++++++++++++++++++++++++++++++++++++++
Sound travels slower than light
Move faster in water than air.
Wind blowing through leaves and other objects creates sounds.
Answer:
(Question) Which type of wave needs a medium to travel?
(Answer) sound waves, because they travel by oscillating molecules
(Question) What do both sound and light waves transfer?
(Answer) energy
(Question) How does an increase in amplitude affect sound and light waves?
(Answer) louder sound and brighter light
(Question) What happens to the wavelength when the frequency increases?
(Answer) The wavelength decreases.
(Question) Which of the following is true about sound waves?
(Answer) Sound moves faster in the ocean than in the air.
Explanation:
i just did the quick check
A car starting from rest accelerated at the rate of 0.5 m/s². What would be the final velociety of the car and how much time would it take to cover 1.6kms?
Answer:
1) 800m/s
2) 2 seconds
Explanation:
Acceleration= velocity/time
Where acceleration= 0.5 m/s²
Time= 1.6kms= 1.6×10^3 seconds
If we substitute we have
0.5=v/(1.6×10^3)
V=800m/s
the final velociety of the car is 800m/s
Velocity= distance/time
800= (1.6×10^3)/ time
Time= 1.6×10^3/800
=2 seconds
Hence the time it will take to cover is 2seconds
Tycho Brahe's contribution to astronomy included: Tycho Brahe's contribution to astronomy included: inventing the telescope. proving that Earth orbits the Sun. collecting data that enabled Kepler to discover the laws of planetary motion.
Answer:
C: collecting data that enabled Kepler to discover the laws of planetary motion
Explanation:
He developed precise instruments available before telescope was discovered. Thus, option A is not part of his contribution.
Nicolaus Copernicus is the one that proved that the earth orbits the sun, thus option B is not part of Tycho's contribution.
Tycho's observations of planetary motion which had great accuracy is what proved that circular orbits could not work. Now, this detailed and accurate observations of the planet's position was fundamental in helping Kepler to discover the laws of planetary motion. So option C is correct.
Before the telescope was invented, he created precise devices. As a result, It does not constitute a contribution by Tycho because Nicolaus Copernicus was the one who established that the earth circled the sun.
Tychos accurate observations of planetary motion served as the decisive evidence against the viability of circular orbits.
Now, Kepler's ability to discover the laws of planetary motion was greatly aided by these meticulous and precise observations of the planet's position.
Tycho's highly accurate observations of planetary motion served as the decisive evidence against the viability of circular orbits. Now, Kepler's ability to discover the laws of planetary motion was greatly aided by these meticulous and precise observations of the planet's position.
Thus, Before the telescope was invented, he created precise devices. As a result, It does not constitute a contribution by Tycho because Nicolaus Copernicus was the one who established that the earth circled the sun.
Learn more about Tychos, refer to the link:
https://brainly.com/question/29442423
#SPJ6
What would happen if the gravitational force between the moon suddenly disappeared?
2. Explain how the number of batteries and the number of coils of wire affect the strength of an electromagnet.
Answer:
The more the number of batteries and coils, the more the electromagnetism.
Explanation:
An electromagnet is a structure formed by passing electricity through a good conductor. Due to the 'Magnetic Effect Of Electric Current', the object functions as an electromagnet, that is, by attracting magnetic objects to it.
This intensity of electromagnetism is greatly dependent on the Electric flow or Current as well as the Number of coils on the electromagnet.
By increasing the number of coils in the electromagnet, you actually increase the electric flow per area or the Magnetic Induction, helping to broaden its magnetic field.
The more batteries you connect to a circuit, the more will be its voltage. Similarly, the more batteries you connect to an electromagnet, the greater will be its strength, due an increased flow of electrons.
If you are holding a stack of books at your waist and then you walk across the room your hands did?
1) efficiency
2) power
3) work
4) no work
Answer:
3. Work
Explanation:
Number 1 isn't correct because you are not using efficiency to hold books and walk across the room.
Number 2 could be correct but isn't in this situation because you use power only to hold the books but not to walk across the room.
Number 4 is not correct because you need to do work to do something.
Take some time to research a utility plant. If there is one in your area, you may even visit it. Otherwise, look up a type of plant that produces energy - such as a nuclear power plant, a hydroelectric plant, or a coal-burning plant. Find out what energy resources are brought into the plant. Then find out what energy and what “waste” is produced by the plant. Describe how the two Laws of Thermodynamics apply to what you find out in your research. Be thorough. You will be using the information you gather to engage in a debate with your class about thermodynamics.
Answer:
bro we cant do this
Explanation:
Answer:
The energy resource brought into a coal power plant is coal.
Found the answer at: https://www.tva.com/energy/our-power-system/coal/how-a-coal-plant-works#:~:text=Coal%2Dfired%20plants%20produce%20electricity,to%20start%20the%20process%20over.
The waste produced by coal power plants is coal ash and the energy produced by coal power plants is electricity.
Answers found at: http://www.groundtruthtrekking.org/Issues/AlaskaCoal/Coal-Ash-Combustion-Wastes.html and https://www.tva.com/energy/our-power-system/coal/how-a-coal-plant-works#:~:text=Coal%2Dfired%20plants%20produce%20electricity,to%20start%20the%20process%20over.
The two laws of thermodynamics apply to what I found out in my research because I know that the entropy increase due to the combustion of conventional fuels is much larger than that resulting from that of nuclear fuels, and is therefore much more dangerous. Also, I know that heat is used to burn coal and create energy.
Found answer at: https://www.encyclopedie-energie.org/en/energy-consumption-and-entropy-release-in-the-biosphere/
Explanation:
Hope this helps, i got an okay score on it but better than nothing i guess lol
A rope hangs between two cliffs, edge A and edge B. There is a 250 kg hiker sliding across and is closer to
edge A than edge B. The angles that the ropes make below the horizontal are 35° below edge A and 65° below
edge B. What is the Tension in both ropes?
Answer:
1655.5 N
Explanation:
We resolve the forces on the rope into horizontal and vertical components. Since the only vertical force exerted on the rope is the weight of the man, this weight equals the vertical components of the tensions on both sides of the rope .
The only horizontal forces acting on the rope are horizontal components of both tensions on both sides. Since the hiker doesn't move sideways, they cancel out and he is balanced. So, the net horizontal force is zero.
Let T be the tension in the rope. So, each vertical component on side A is Tsin35° and that on side B is Tsin65°. Let the weight of the man be W = mg where m = mass of hiker = 250 kg and g = acceleration due to gravity = 9.8 m/s².
So, since the hiker balances, Tsin35° + Tsin65° = mg
0.5736T + 0.9063T = 250 kg × 9.8 m/s²
1.4799T = 2450 N
dividing both sides by 1.4799, we have
T = 2450 N/1.4799
T = 1655.52 N
T ≅ 1655.5 N
So, the tension in the rope equals T = 1655.5 N
Which source should you NOT consult to validate an advertisement's claim?
A.
peer-reviewed scientific journals
B.
websites of government agencies
C.
your doctor
D.
website of the product manufacturer
Answer:
I believe D
Explanation:
Of course the manufacturer would most likely be biased to the product the have created, but the other sources would have no reason to. Hope this helps!
the multimeter functions as an ammeter
Answer: What?
Explanation:
Fossils are rare because certain conditions are needed to preserve an organism in order for it to fossilize, and those conditions themselves are rare. Which of these conditions is LEAST likely to result in fossilization? A) Organism has an exoskeleton. B) Organism lives in or near water. C) Organism lives in a colder climate. D) Organism is prey to several species.
Answer:
D
Explanation:
The least of the conditions that can result in fossilization would be when an organism is a prey to several species.
Fossils are remains or traces of organisms that have been geological preserved and a prey is an organism that is often hunted and serves as food to bigger organisms. When an organism is eaten, the probability of it becoming a fossil becomes low. Unless such an organism is usually partially eaten by predators, there would not be any remains, let alone being fossilized.
The correct option is D.
A car was moving a 14 m/s. After 30 seconds, it’s speed increased to 20 m/s. What was its acceleration during this time?
Answer:
acceleration = 0.2 m/s/s
Explanation:
initial velocity u = 14
final velocity v = 20
time = 30
acceleration = ?
v = u + at
20 = 14 + 30a
30a = 6
a = 0.2 m/s/s
Answer:
For the aceleration we have:
V = Vi + a * t
Being:
V = 20 m/s
Vi = 14 m/s
a = ?
t = 30 s
Then, lets replace acording the formula:
20 m/s = 14 m/s + a * 30 s
Clear "a":
a = (20 m/s - 14 m/s) / 30 s
a = (6 m/s) / 30 s
a = 0,2 m/s²
The aceleration of the car is 0,2 meters per second squared.
What is the kinetic energy of a 2000 kg car that is traveling 10 m/s
Answer:
100,000 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 2000 \times {10}^{2} \\ = 1000 \times 100 \\ = 100000[/tex]
We have the final answer as
100,000 JHope this helps you
Suggest a form of renewable energy that could be used to power an electric ticket machine that only needs to work during daylight hours.
Answer:
solar panel or wind turbine
Explanation:
Because solar panel gives energy to electricity by sun and wind turbine gives energy through wind and both are renewable
Renewable energy that could be used to power an electric ticket machine that only needs to work during daylight hours is solar energy.
What is solar energy?Solar energy is the term for solar radiation that can create heat, trigger chemical reactions, or create electricity. The total solar energy incident on Earth is far greater than the global energy needs at the moment and in the future. This highly distributed source has the ability to meet all future energy demands if properly exploited.
Due to its limitless supply and lack of pollution, solar energy is predicted to become a more appealing renewable energy source in the twenty-first century than the finite fossil fuels coal, petroleum, and natural gas.
Although sunlight is by far the most potent energy source that Earth receives from the Sun, its intensity at the surface of the planet is actually rather modest.
This is primarily due to the massive radial radiation propagating from the far-off Sun. Earth's atmosphere and clouds, which absorb or scatter as much as 54% of the incoming sunlight, cause a comparatively small additional loss.
Learn more about solar energy here:
https://brainly.com/question/9704099
#SPJ2
A student presses her palm by her thumb with a force of 75 N . What would be the pressure under her thumb having contact area is 1.5 cm2
Step 1: Identify the knowns.
[tex] F=75 N [/tex]
[tex] A= 1.5 cm^2[/tex]
Step 2: Determine.
[tex] P= \frac {F} {A}\ [/tex]
[tex] P = \frac {75 N} {1.5 cm^2}\ = 50 Pa [/tex]
Answer:
50 Pascal
Explanation:
Pressure= Force/Area
P=75/1.5
=50 Pascal
MARK ME AS BRAINIEST IF MY ANSWER HELPED YOU :):)
Which type of fault is shown by the illustration below where the hanging wall moves down relative to the foot wall?
A. normal fault
B. reverse fault
C. strike slip fault
D. thrust fault
Answer:
A. normal fault NOT
B. reverse fault YES IT IS
Explanation:
I hope this helps
Have a Blessed Day
The boy a projects a ball downwards with velocity v ,where it reaches the boy b after 0.5 s . So the ball the reaches the ground after time ...... from the moment of projection (g=10 m/s2)
Answer:
the answer i
Explanation:
PLEASR HELP ME, WILL GIVE BRAINLIEST
a sportsman rushed the circle 15 times in 1/6 hour. distance of this running track 0.4 km. what is the average speed of sportsman?
a) 20 m/s
b) 50 m/s
c) 35 m/s
d) 10 m/s
e) 25 m/s
f) 20.5 m/s
(an answer with explanation would be great)
Answer:
d. 10 m/s
Explanation:
where would you expect light waves to move faster?
a - in space
b- through an iceberg
c- under the sea
d- on a mountain top
Answer:
a
Explanation:
is love really a feeling or is it just mental?
Answer:
i really don't know anything about love ,because i have never experienced this .but love is just a person feeling and emotion about someone ,that we name as love.
Explanation:
HELP ASAP!!!!!!! PLEASE WILL GIVE BRAINLIEST
Name the three major parts of a cell and their functions
Answer:
Cell Membrane (Plasma Membrane)
Cytoplasm.
Nucleus.
Explanation:
The cytoplasm is home to many activities of the cell as it contains molecules, enzymes that are crucial in the break down of the waste. The cytoplasm also assists in metabolic activities. Cytoplasm provides shape to the cell. It fills up the cells thus enabling the organelles to remain in their position.
The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. And that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
what is this Regeneration
Answer:
Regeneration means that an organism regrows a lost part, so that the original function is restored.
How high must you lift a 25 Newton book for it to have the same increase in potential energy as a 20 Newton book that was lifted to 0.5 meters?
Given :
An object with weight 20 N was lifted to 0.5 meters.
To Find :
How high must you lift a 25 Newton book for it to have the same increase in potential energy as the given book.
Solution :
Since both have same potential energy :
[tex]P.E_2 = P.E_1\\\\W_2h_2 = W_1h_1[/tex]
Putting all given values in above equation :
[tex]25h_2 = 20\times 0.5\\\\h_2 = \dfrac{20\times 0.5}{25}\\\\h_2 = 0.4\ m[/tex]
Therefore, book with same potential energy is at a height of 0.4 m.
which property makes radio waves ideal for carrying and transmitting data?
a.) having long wavelengths
b.) having high frequencies
c.) transferring high amounts of energy
d.) traveling faster than the speed of light
Answer:
a.) having long wavelengths
Explanation:
Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.
Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data. Some examples of communication technologies that uses radio waves are radio set, mobile phones, television etc.
Hence, the property which makes radio waves ideal for carrying and transmitting data is that, it is having long wavelengths.
Answer:
A. having long wavelengths
Explanation:
What is the MAIN idea of the section "Green Loses Its Power In Fall"?
who is the best soccer player?
Which characteristic of a sound is affected by the amount of energy used to create that sound? In what direction the sound will travel how fast or slow the sound travels in a particular medium how high or low the sound's pitch is how loud or soft the sound is
Answer:
The correct option is;
How loud or soft the sound is
Explanation:
The loudness of a sound wave is given by the amount of energy that the pressure wave carries and it is measured in decibels (dB) which is the relative intensity of the pressure wave of a sound to the standard pressure
A loud sound has a high amplitude and a soft sound has a low amplitude, such that as the amplitude of the sound is increased, due to increased energy input, the sound becomes louder, and as the amplitude of the sound is decreased due to reduced energy input, the sound becomes softer.