Answer:
people separate mixtures in order to ger a specific substance that they need. 2. the other thing people separate mixtures to remove the unrequired components. 3.To get a pure substance
Explanation:
hope this helps probably don't because you asked this a week ago but have a good day :) ❤
A high speed train travels with an average speed of 227 km/h. The train travels for 2 h.how far does the train travel in meters?
2 x 227 km/h = 454 m
Answer:
[tex]\boxed {\boxed {\sf 454 \ kilometers}}[/tex]
Explanation:
Distance is the product of speed and time.
[tex]d=s*t[/tex]
The speed of the train is 227 kilometers per hour. The time is 2 hours.
[tex]s= 227 \ km/hr \\t= 2 \ hr[/tex]
Substitute the values into the formula.
[tex]d= 227 \ km/hr * 2 \ hr[/tex]
Multiply and note that the hours will cancel each other out.
[tex]d= 227 \ km* 2[/tex]
[tex]d=454 \ km[/tex]
The train travels 454 kilometers in 2 hours.
What's a refractive medium that focuses light to a single point?
Answer:
The convex lens is shaped so that all light rays that enter it parallel to its axis cross one another at a single point on the opposite side of the lens.
Explanation:
Which of the following organisms is a decomposer?
a plant
a tiger
a mushroom
a deer
Which of the following describes a lunar eclipse?
A
The Moon's shadow is on Earth.
B
Earth's shadow is on the Sun.
C
Earth's shadow is on the Moon.
D
The Moon's shadow is on the Sun.
Answer:
From our perspective on Earth, two types of eclipses occur: lunar, the blocking of the Moon by Earth's shadow, and solar, the obstruction of the Sun by the Moon. When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth.
Hopes this helps
Answer:
c
Explanation:
when earth casts it shadow on moon then moon is not visible from earth.
and lunar eclipse occurs when earth casts its shadow on moon
1. Which energy source has no greenhouse gas emissions or health impacts on humans, but is only available in certain geographic locations?
Geothermal power
Nuclear power
Hydrogen fuel
Methane gas
Answer:Nuclear power
Answer: geothermal
Explanation: I just took this test.
A _______ is a series of waves that come ashore at interval 10-45 mintues
Answer:
tsunami
Explanation:
A tsunami is a series of waves that come ashore at interval 10-45 mintues
Which statement is a conclusion ASAP
A. How can cut flowers stay fresh for a longer period of time ?
B. Florists put cut flowers in sugar water , so flowers in sugar water stay fresh longer
C. It´s better to give people balloons than cut flowers that will die
D. Cut flowers placed in sugar water stay fresh longer than flowers in regular water
One star has a magnitude of -1.5 and another star has a magnitude of +0.6. What is the ratio of brightness of these two stars?
Answer:
7
Explanation:
[tex]The \ ratio \ of \ brightness \ of \ these \ two \ stars \ is:[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(m_{(second \ star )} - (m_{first \ star } ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(0.6 - (-1.5 ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(2.1)}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 6.9[/tex]
[tex]\mathbf{\dfrac{b_{first \ star }}{b _{second \ star }} \simeq 7}[/tex]
Which of the following statements about gravity is FALSE?
B
A Gravity plays an important role in the formation of solar systems.
Gravity keeps the planets in their proper orbits around the Sun.
Stars are made of clouds of dust and gas that come together as a result
of gravity.
The Law of Universal Gravitation states that the gravitational force is
stronger as objects get farther apart.
с
D
Answer:
the last one. gravitational force is stronger as objects get further apart
The false statement about gravity among the given choices is - D. The Law of Universal Gravitation states that the gravitational force is stronger as objects get farther apart.
Gravity or the universal gravitational force is the force of attraction exerts between any two objects with mass in the universe. It is also exerted between the attraction of the earth's mass and bodies with mass near its surface.
The universal gravitational force is inversely proportional to the square of the distance between any two objects,[tex]F = \frac{1}{r^2}[/tex]So, an increase in the distance will result in the force of gravitational attraction between them also decreases make it weaker.The universal gravitational force plays an important role in making the solar system by keeping the different planets in their proper orbits around the Sun.Thus, The false statement about gravity among the given choices is - option D.
Learn more about the role of gravitational force:
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What is the elevation of point B?
What about F?
Explanation:
Since I can only do this by observation, the elevation of F is approximately 850km and the elevation of B is 925km.
How many neutrons does potassium have?
Answer:
the answer is 20 neutrons
Explanation:
Answer:
20 neutrons
The nucleus of an atom of potassium contains 19 protons and 20 neutrons.
An Indy 500 race car's velocity increases from 4.0 m/s to +36
m/s over a 4.0 s time interval. What is its average
acceleration?
Answer:
The average acceleration is [tex]8\ m/s^2[/tex]
Explanation:
Uniform Acceleration
When an object varies its velocity at the same rate, the acceleration is constant.
The relation between the initial and final speeds is:
[tex]v_f=v_o+a.t[/tex]
Where:
vf = Final speed
vo = Initial speed
a = Constant acceleration
t = Elapsed time
The acceleration can be calculated by solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
The Indy 500 race car increases its speed from vo=4 m/s to vf=36 m/s in t=4 s. Thus, the average acceleration is:
[tex]\displaystyle a=\frac{36-4}{4}=8\ m/s^2[/tex]
The average acceleration is [tex]8\ m/s^2[/tex]
2 forces of magnitude, 5N and 8N respectively act at the same point and are inclined at 45 degree. Calculate the magnitude of the resultant force
Answer:
F = 36.956 N
Explanation:
The magnitude of the resultant force will be;
F = F1 × F2 × cosθ.
We are given;
F1 = 5 N
F2 = 8 N
The angle between the 2 forces is 45°
Thus, angle between each force and the vertical axis is 45/2 = 22.5°
F = 5 × 8 × cos 22.5
F = 40 × 0.9239
F = 36.956 N
What is a magnet in your own words
An outfielder with a mass of 86 Kilograms catches a baseball with a mass of 0.15 kilograms.The velocity of the ball just before being caught is 40 meters per second.What is the impulse imparted by the ball onto the outfielder?
A. 6.00 Ns
B. 3,440 Ns
C. 2.00 Ns
D. 3,434 Ns
Answer:
C
Explanation:
Isabella has lived in Miami, Florida, all her life, and she knows the weather is warm and humid much of the time. What factors play a part in determining the climate found in Florida? Choose the three that apply
A-Ocean currents
B-Latitude
C-High altitude
D-Prevailing winds
E-Long distance from water
Answer:
B,A, and D
Explanation:
WILL GIVE BRAINLIEST IF CORRECT
How much heat is needed to raise the temperature of 100 g of water by 50 K, if the specific heat of water is 4184 J/kg°K
Answer:
Q = 20900 [J]
Explanation:
We must use the following energy equation to determine heat transfer, based on specific heat, mass, and heat transfer.
[tex]Q=m*C_{p}*DT[/tex]
where:
Q = heat energy [J]
Cp = specific heat = 4184 [J/kg*K]
m = mass = 100 [g] = 0.1 [kg]
DT = temperature change = 50 [K]
[tex]Q= 0.1*4180*50\\Q=20900[J][/tex]
Which statement is accurate about how the aurora borealis is formed?
When the electrons jump to a higher energy state, they release energy as electromagnetic radiation, light.
When electrons are excited, they move to a lower energy level.
An electron in an energy level closest to the nucleus has greater energy.
When the electrons fall to a lower energy state, they release energy as electromagnetic radiation, light.
Answer:
When the electrons jump to a higher energy state, they release energy as electromagnetic radiation, light.
Explanation:
When the solar wind gets past the magnetic field and travels towards the Earth, it runs into the atmosphere. As the protons and electrons from the solar wind hit the particles in the Earth's atmosphere, they release energy – and this is what causes the northern lights.
What is the value of the GPE store for a 10 kg object held 50 m above the surface of the Earth (assume g = 10 N/kg)?
Answer:
5,000J
Explanation:
GPE = mass x gravity x height
GPE = 10 x 10 x 50
= 5,000
In a perfectly elastic collision, a 0.400 kg ball moving toward the east at 3.7 m/s suddenly
collides head-on with a 0.200 kg ball sitting at rest.
importance of electric circuit
Answer:
It is important because it carries useful energy through your house that you can use for a variety of tasks.
Explanation:
Hope this helped !
The speed of a sound wave depends on....
A: both the medium's temperature and the density of the medium
B: the density of the medium
C: the medium's temperature
D: the frequency
plz help help me i have one minute
Answer:
the answer is C
Explanation:
this is because pressure is defined as the force acting per unit area thus,
the lower the area the higher the pressure
this can be explained by This,
will you experience pain if touch the tip of the needle or your pen
the area in the needle is less thus, more pressure
hope this helps,
The speed of sound in water is less than that in air. *
True
False
Answer:
The speed of sound in water is two times slower than that in air. Sound travels much faster in space than in water. Warmer water allows sound to travel faster so i think true
Explanation:
Convert 50,000 ML to mL
1. 5 x 10^5 mL
2. 5 x 10^-5 mL
3. 5 x 10^13 mL
4. 5 x 10^-13 mL
All of following are types of kinetic energy EXCEPT for: *
O sound energy
O thermal energy
Olight energy
O chemical energy
O mechanical energy
According to Coulomb's law, the force of attraction or repulsion between two charges is
A.
directly related to the magnitudes of the charges and the square of the distance between them.
B.
inversely related to the magnitudes of the charges and the square of the distance between them.
C.
directly related to the magnitudes of the charges and inversely related to the square of the distance between them.
D.
inversely related to the magnitudes of the charges and directly related to the square of the distance between them
Answer:
B is the answer
Explanation:
thank you I hope it helps you
The force is directly related to the magnitudes of the charges and inversely related to the square of the distance between them. Then the correct opption is C.
What is the Coulomb's law?The Coulomb's law states that the electrostatic force is the ratio of the product of the charges and square of the distance between them.
Let the cherges be q and Q and the distance between them is r. Then the force is given as,
F = kqQ / r²
The power is straightforwardly connected with the extents of the charges and contrarily connected with the square of the distance between them. In this way, the right choice is C.
Thus, the correct option is C.
Learn more about Coulomb's law:
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Can you please tell me the answer
Answer:
Explanation:
s=d/t
7.5 times 10^10/8.0 times 10^6=9.375 times 10^15
Hope this helps
A 10-kg box Initially at rest and moves along a frictionless horizontal surface. A Horizontal force to the right as applied to the box. The magnitude of the box change of the function of time as shown
b. What is the velocity of the box at 10 seconds? Show your work.
c. If you want to apply at constant force starting at 10 seconds, that would stop the box at exactly 20 seconds. What would the magnitude and direction of that force be? Show your work
Answer:
b. 1.1 m/s c. -1.1 m/s
Explanation:
b.
m x v=f x t
The mass is 10 kg
10 x v (equation for momentum) = f x t (impulse)
you would find the impulse by finding the area under the graph, and then dividing by the mass
So in this case:
10 x v = 11
then divide by the mass
v = 11/10
v= 1.1 m/s
c.
F x t = impulse
we are trying to find force (magnitude)
impulse/t = F
we said that in order for it to stop the impulse for b would be 11, so if thats the case it would be 11 but it would be negative because when going in a positive direction and suddenly stopping the direction changes.
-11/t = F
to find t all we need to do is find the amount of seconds between 10 and 20, that would be 10.
-11/10 = F
F= -1.1 m/s
Answer B:
The velocity of the box at 10 seconds is :
Formula :m x v=f x t
Given Information :
Mass(m)=10kg
10 x v (equation for momentum) = f x t (impulse)10 x v = 11v = 11/10v= 1.1 m/sTherefore, the velocity of the box at 10 seconds is 1.1m/s.
Answer C:
The magnitude and direction of that force be :
Formula:F x t = impulse
impulse/t = F-11/t = FTo find t all we need to do is find the amount of seconds between 10 and 20, that would be 10.
-11/10 = FF= -1.1 m/sThe magnitude and direction of that force will be -1.1m/s.
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Two conducting spheres rest on insulating stands. Sphere B is smaller than Sphere A. Both spheres are initially uncharged and they are touching. A third conducting sphere, C, has a positive charge. It is brought close to (but not touching) Sphere B as shown. What is the net charge (positive, negative, or zero) on Sphere A?
Answer:
Explanation:
Sphere B and sphere A are touching so they will act as a single body . A positively charged sphere C is brought near sphere B . So there will be induction of charge on sphere B and sphere A . Opposite charge will be induced on nearer sphere and same charge will be induced on distant sphere . Hence sphere B will be negatively charged and sphere A will be positively charged. The amount of charge induced on sphere B and A will be same and it will remain as long as sphere C is kept near sphere B . As soon as sphere C is removed , induced charges will also neutralize each other .
