Hello!
a) What is the change in momentum?
The change of the momentum is the velocity, because the velocity is reduced to zero.
We can calculate the aceleration, applicating the formula:
[tex]\boxed{a=\frac{V-Vi}{t} }[/tex]
Like you see, the final velocity will be zero, so:
[tex]a = \dfrac{0m/s-40m/s}{4s}[/tex]
[tex]a = \dfrac{-40m/s}{4s}[/tex]
[tex]a = -10\ m/s^{2}[/tex]
Like you see, the aceleration applicate by superman is of -10 m/s^2.
If the aceleration is negattive, means the velocity will decrease.
b.) What is the magnitud of the force wich superman exerts on the train?
For calculate the force applicate for superman, lets applicate the second law of Newton:
[tex]\boxed{F=ma}[/tex]
Lets replace and resolve it:
F = 8x10^3 kg * (-10 m/s^2)
F = 8000 kg * (-10 m/s^2)
F = -80 000 N
The force applicated is of -80000 Newtons.
When the force is negative means the force applicated in the another direction of the object what is traveling.
How fast is a 5 kg object traveling that has 20 kg m/s of momentum?
Answer: 100
Explanation:
What is the speed of a jet plane that flies 8100 km in 27 hours (in km/hr)
Even though you are getting closer to the sun as you ascend into the troposphere, why does the temperature drop? the lower atmosphere is heated by the ground warm air stays below cold air the troposphere is a stable layer ozone blocks the sunlight
The Sun light is reflected back by earth. On process of reflecting back the sunlight, the lower layer of troposphere absorbs the most sunlight and upper layer absorbs the least sunlight. So when We ascend to troposphere, we move towards the upper layer of troposphere where sunlight is least absorbed and is colder than lower layer where sunlight is most absorbed
In the troposphere, the temperature generally decreases with altitude. The reason is that the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.
An object with a mass of 7kg gains the speed 26 meters per second after traveling the distance 2.8m. Calculate the resulting force that acts on it.
Answer:
F = 845 [N]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f} ^{2} =v_{o} ^{2} +2*a*x[/tex]
where:
Vf = final velocity = 26 [m/s]
Vo = initial velocity = 0
a = acceleration [m/s²]
x = distance = 2.8[m]
[tex]26^{2} = 0 +(2*a*2.8) \\5.6*a = 676\\a = 120.71[m/s^{2}][/tex]
Now we have to use Newton's second law which tells us that force is equal to the product of mass by acceleration.
ΣF = m*a
where:
F = force [N]
m = mass = 7 [kg]
a = acceleration = 120.71 [m/s²]
[tex]F = 7*120.71\\F = 845 [N][/tex]
HELP ASP PLSSSSSS ASP
Answer:
heart rate increases during activity
Explanation:
You can work at 70 to 85 percent of your maximum heart rate during vigorous activity.
Which device is designed to convert chemical energy into kinetic energy ?
A.an A.C. Generator
B. A battery powered torch
C.a car engine
D.a wind-up mechanical clock
Answer:
A.C. Generator
Explanation:
The device designed to convert chemical energy into kinetic energy is an A.C generator.
The generator uses fuel to cause the mechanical motion of the pistons in the device.
Chemical energy is a form of energy found between the bonds of compounds and molecules. When the bonds are broken, energy is released. The heat energy produced drives pistons and cause mechanical motion of the body. This is a form of kinetic energy which causes the motion of a body.Electromagnetic waves differ from other types of waves because they are (2 points)
Group of answer choices
a. a continuous transfer of energy.
b. able to travel through a vacuum.
c. a visible form of energy.
d. able to move particles in a medium.
Answer:
b. able to travel through a vacuum.
Explanation:
The most distinguishing factor of an electromagnetic waves is that they are able to travel through a vacuum.
These waves do not require materials in a medium for propagation.
Electromagnetic waves are formed by the propagation of the electric and magnetic fields. They vibrate at an angle of 90° . They are unlike like mechanical waves that requires that requires materials in medium for their propagation.is aluminum foil reflecting onto something conduction, convection, or radiation?
(this is for science sorry if i chose the wrong catagory I don't know the fancy word for science)
Which plate undergo subduction at oceanic-continental convergent plate boundaries?Why?
Answer:
Oceanic crust may collide with a continent. The oceanic plate is denser, so it undergoes subduction. This means that the oceanic plate sinks beneath the continent. This occurs at an ocean trench.
Explanation:
The circumference of a classroom
clock is 34.5 inches. Find the diameter
of the clock. Round to the nearest
whole number.
Answer:
10.981691073341
So, 11 inches would be the diameter.
Explanation:
Please mark brainliest if correct!
The chart below shows the dates of eclipses in the years 2006 and 2007. What is the best explanation for the frequency of eclipses? The Moon's orbit is tilted relative to the plane of the Earth's orbit. About every six months, the Sun, Moon and Earth are aligned enough for a solar and a lunar eclipse to occur. The Earth and Moon orbit the Sun in opposite directions. When the Moon's orbit crosses the Earth's orbit, a lunar or solar eclipse will occur. A lunar or a solar eclipse occurs every time the Moon orbits the Earth. The Moon orbits the Earth four times a year. The atmospheric conditions that cause eclipses are only found at certain locations and times of year.
Answer:
It's A
As the Gizmo shows, the Moon orbits at an angle relative to the plane of Earth's orbit. Usually, the Moon is above or below the Earth when an eclipse could happen. Every six months or so, the Moon, Earth and Sun are lined up sufficiently to create a lunar and a solar eclipse.
Answer:
A
Explanation:
The Moon's orbit is tilted relative to the plane of the Earth's orbit. About every six months, the Sun, Moon and Earth are aligned enough for a solar and a lunar eclipse to occur.
What are the reactants in the photosynthesis chemical equation?
The photosynthesis chemical equation states that the reactants
(carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas. The single chemical equation represents the overall process of photosynthesis.
hope this help you!
PLEASE HELP ME!!!!
A. The velocity increases during the time periods labeled A and C.
B. The velocity remains constant as the ball bounces.
C. The velocity increases during the time periods labeled B and D.
D. The velocity decreases during all time periods.
Answer:c
Explanation:
Answer:
A. The velocity increases during the time periods labeled A and C.
Explanation:
What is the centripetal force needed to keep a 3.0kg mass moving in a circle of radius 0.50 m at a speed of 8.0m/s?
Answer:
384N
Explanation:
Given parameters:
Mass = 3kg
radius = 0.5m
Speed = 8m/s
Unknown:
Centripetal force = ?
Solution:
The centripetal force is the inward force that keeps a body in motion along a circular path.
It is mathematically expressed as;
F = [tex]\frac{mv^{2} }{r}[/tex]
m is the mass
v is the speed
r is the radius
Now insert the parameters and solve;
F = [tex]\frac{3 x 8^{2} }{0.5}[/tex] = 384N
Explain why common "contact forces" such as a person pushing on a wall are actually caused by the electric force. In your answer, you must discuss the role of subatomic particles in this interaction, whether the atoms in the person’s hand and the wall come into contact or not
Answer:
are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, inte
Explanation:
The contact forces, such as friction or the push force, are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, intense repuesive forces are formed that objects move. We can see that in these forces the electrons are still attached to the material and only electoral repulsion is what creates the force.
In the previous explanation, it is valid for all types of material, the only change occurs due to the strength of the bond, in the case of materials with free electrons, such as metals, the forces are small, so the sliding occurs for small bourgeois
In insulating materials such as rubber where the electronons are tightly bound, closer proximity is needed to move the electrons from their equilibrium position.
An object has a tangential velocity of 23 m/s as it moves around a circular track with a
radius of 20 meters. What is the object's acceleration
Answer:
26.5m/s²
Explanation:
Given parameters:
Tangential velocity of the object = 23m/s
Radius of track = 20m
Unknown:
Acceleration = ?
Solution:
The acceleration of the body is its centripetal acceleration. It is given by;
a = [tex]\frac{v^{2} }{r}[/tex]
v is the tangential velocity
r is the
a = [tex]\frac{23^{2} }{20}[/tex] = 26.5m/s²
Write your reflection about the three levels of perfection of mahayana Buddhism. Your reflection paper must contain 100 words?............please help me
Answer: Mahayana is a term for Buddhist culture. It is considered as existing branches of Buddhism.
Explanation:
The mahayanas is a major movement typically in the history of Buddhism. It was originated in Northern India. It comprises of many schools. It involves the reinterpretation of the fundamental human beliefs. This also involves the interpretation and teaching of Buddhism.
The three-level of perfection of Mahayana Buddhism are:
generositymorality, andpatienceThese three are mainly related to the virtuous practices for anyone, for a better and happy life in society. There are three more perfections those are-energy, meditation, and wisdom.
Mahanayan is a term under the Buddhist culture and is considered as the present or existing branch of Buddhism. It was originated in Nothern India, which comprises many schools.
The three main perfections state how the human being should live. The perfection of generosity is said as the entryway to dharma, it is the beginning of the aspiration to realize enlightenment for all beings. The perfection of morality guides us until we find our own balance, and the perfection of patience literally means "able to withstand."
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Gravity causes all falling objects to accelerate at a rate of 98 m/s2.
O True
O False
Long-Distance Space Travel
Many scientists and engineers are working toward the goal of sending astronauts to Mars. The trip is estimated to take about 9 months each way. It is very expensive to take enough oxygen to last the whole trip. The astronauts also need enough food, and there has to be a way to get rid of excess carbon dioxide created by their cellular respiration.
Present a plan for the astronauts. Explain how growing food during space flight will help regulate carbon dioxide and oxygen levels. List the supplies the astronauts would need.
Answer:
Green house
Explanation:
You could build a little green house sorta thing bc plants produce oxygen and then the plants you can eat also you are supposed to have water so there s the plants water!
Air. Plants are necessary for the creation of breathable air on Earth. During photosynthesis, plants convert carbon dioxide into oxygen and improve the air we breathe.
What food during space flight help regulate carbon dioxide?They can serve as food or as a cooling environment for astronauts traveling in space. Plants can help regulate cabin humidity by metabolizing atmospheric carbon dioxide to produce useful oxygen.
The crews of human spacecraft may experience psychological benefits from growing plants in space. The ISS could benefit from plant growth by producing oxygen for astronauts to breathe and removing carbon dioxide from the atmosphere.
According to the researchers' findings in their article, eating these fresh foods is also thought to have the additional advantages of reducing stress and boosting morale.
Therefore, The ability to grow vegetables in greenhouses in space could help astronauts supplement their diets.
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What is it called when an unwanted material that contains radioactive atoms is present on another material?
Answer:
Radioactive contamination
Explanation:
radioactive contamination is when radioactive atoms are present on somethingWhen an unwanted material that contains radioactive atoms is present in another material is known as Radioactive contamination.
What are radioactive atoms?The process of radioactive decay is how an unstable atomic nucleus loses energy through radiation. A substance that has unstable nuclei is regarded as radioactive. Alpha, beta, and gamma decay are three of the most prevalent forms of decay, and they all entail the emission of one or more particles.
According to the statement, "For a given time, the number of nuclei of the elements existing at that moment is exactly proportional to the rate of radioactive decay of an atom." This may be expressed as, where N is the total number of nuclei, d N d t N.
When radioactive particles are deposited on, inside of, or around an individual or a business, nuclear radiation results. When radioactive materials are discharged into the environment, they have the potential to contaminate the air, water, surfaces, soil, plants, buildings, people, and animals.
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Based on the law of conservation of energy, which statement is correct?
A Energy is always being added to all parts of the Universe.
B. Energy is often destroyed in some parts of the Universe.
O C. Energy in a closed system cannot change forms.
D.
Energy in an isolated system remains constant.
Answer:
D. Energy in an isolated system remains constant
Explanation:
I recently took this test and this was the correct answer. Please like if this helped you! :)
The statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.
What is the law of conservation of energy?The law conservation of energy can be defined as the energy that cannot be created either it cannot be destroyed it only can change from one state to another state.
As we know, from the definition of the law of conservation of energy,
The energy that cannot be created either cannot be destroyed.
According to the rule of conservation of energy, the energy in an isolated system doesn't change.
Thus, the statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.
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Which is a characteristic of all ions? They are made of one type of atom. They have one overall charge. They are made of two or more types of atoms. They have two or more overall charges.
Answer:
They are made of one type of atom.
Explanation:
Answer:
The answer is A
Explanation:
Why hasn't scientific inquiry displace faith, intuition, and dreams?
Answer:
scientific inquiry has not displaced faith, intuition, and dreams. These traditions and ways of knowing have emotional value and provide moral guidance to many people. But hunches, feelings, deep convictions, old traditions, or dreams cannot be accepted directly as scientifically valid.
Why Don't Birds Get Electrocuted When They Land on Electric Wires?
Answer:
There is a thick layer of rubber coating on the wires.
Explanation:
This isn't just the case with birds, your headphones, if you notice closely have a layer of rubber coating as well, to protect you from accidentally touching the wires inside and hurting yourself.
Learning Task No. 3:
Use the diagram showing the relationship among current,
resistance and voltage. Explain the relationship between
current and voltage;
voltage and resistance;
current and resistance.
Write your answer below
Answer:
There is no diagram in this question, however, the question can be answered based on general understanding.
1. current and voltage; direct relationship
2. current and resistance; inverse relationship
3. voltage and resistance; direct relationship
Explanation:
The relationship between current (I), resistance (R) and voltage (V) has been explained by Ohms in his law. In Ohms law, which states that the current flowing through a circuit is directly proportional to the voltage and inversely proportional to the resistance.
This further means that if the voltage (V) increases, then the current (I) also increases and vice versa while if the resistance (R) is increased, the current (I) decreases and vice versa.
The equation represented by this law is:
V = IR or I = V/R or R = V/I
Likewise, the when the resistance is increased, the voltage increases and vice versa.
Therefore;
- Current (I) is directly proportional to the Voltage (V)
- Current (I) is inversely proportional to the Resistance (R)
- Voltage (V) is directly proportional to the Resistance (R)
1. In this activity, you will be looking for a relationship between the mass of the cart and the acceleration of the cart.
Which variable do you need to keep constant during this experiment?
Mass of the cart
The fan force on the cart
The acceleration of the cart
Answer:
Mass of cart
Explanation:
A cycler rides 27.0 km in 13 minutes, then 33.0 km in 17 minutes. What is the jogger's average speed in km per minute?
Answer: 9
Explanation: because you would add 13+4=17, then you would add 27+5=33, so then 4+5=9 so there's your answe
An owl has a mass of 4.00 kg. It dives to catch a mouse, losing 800.00 J of its GPE. What was the starting height of the owl, in meters?
Answer:
h=20
Explanation:
gpe=mgh
800=4×10×x
x=20 hope it helps
When the sun first formed, small bodies of matter called _____ surrounded the newly born sun.
Answer: comets
Explanation:
5. A pendulum is 0.25 m long. What is the frequency of its oscillations?
Answer:
I would say your answer is: The frequency of oscillations is 1 HZ { 1 cycle per second}.
The frequency of pendulum oscillations which is 0.25 m long is 1 HZ (1 cycle per second).
What is frequency?The quantity of waves leaving a spot in relation to time is known as its frequency. Hertz units are used to measure frequency. Humans with typical hearing abilities can hear frequencies between 20 Hz and 20 kHz. The frequency is defined mathematically as the time period divided by the factor of one. The number of rotations or vibrations that a body in periodic motion makes in a given amount of time.
A moving disturbance is referred to as a wave. The waves that must pass through a medium like air or water are referred to as mechanical waves. Other forms of waves, such as electromagnetic waves, can pass through both mediums and a vacuum.
Given:
The length of the pendulum, l = 0.25 m,
Calculate the frequency by following the formula:
f = [tex]1/T[/tex] =ω / 2[tex]\pi[/tex]
Therefore, the frequency of pendulum oscillations which is 0.25 m long is 1 HZ (1 cycle per second).
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