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Answer:
a magnet is a material with a North and South pole
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what is the rotational kinetic energy of the earth? assume the earth is a uniform sphere. data for the earth can be found inside the back cover of the book.
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The rotational kinetic energy of the earth is 2.587 × 10²⁹ J
The rotational kinetic energy of the earth is given by K = 1/2Iω² where I = rotational inertia of earth = 2MR²/5 where M = mass of earth = 5.972 1× 0²⁴ kg and R = radius of earth = 6.4 × 10⁶ m. ω = angular speed of earth = 2π/T where T = period of earth = 24 hours = 24 × 60 × 60 = 86400 s = 8.64 × 10⁴ s
So, K = 1/2Iω²
K = 1/2 × 2MR²/5 × (2π/T)²
K = 4π²MR²/5T²
Substituting the values of the variables into the equation, we have
K = 4π²MR²/5T²
K = 4π² × 5.972 × 10²⁴ kg × (6.4 × 10⁶ m)²/[5(8.64 × 10⁴ s)²]
K = 4π² × 5.972 × 10²⁴ kg × 40.96 × 10¹² m²/[5(74.6496 × 10⁸ s)²]
K = 4π² × 244.61312 × 10³⁶ kgm²/373.248 × 10⁸ s²
K = 9656.93890286 × 10³⁶ kgm²/373.248 × 10⁸ s²
K = 25.87 × 10²⁸ kgm²/s²
K = 2.587 × 10²⁹ J
So, the rotational kinetic energy of the earth is 2.587 × 10²⁹ J
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The brain itself does not contain nerves. How is it part of the central nervous system?
A.
It sends the signals out to the nerves.
B.
It is not—it is part of the endocrine system.
C.
Only parts of the body that move have nerves.
D.
It is a central part of the body, so it is in that system.
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The brain is part of the central nervous system because it sends the signals out to the nerves.
option A.
What is central nervous system?
The central nervous system is made up of the brain and spinal cord.
The brain controls how we think, learn, move, and feel.
The spinal cord carries messages back and forth between the brain and the nerves that run throughout the body.
Thus, we can conclude that the brain itself does not contain nerves, but it sends the signals out to the nerves hence it is part of the central nervous system.
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Which of the following is not an element of installment credit?
A. Fixed loan amount
OB. Repayment schedule
C. Line of credit
D. Fixed payment
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Answers
Answer:
I believe it's A. An installment credit has an interest rate, repayment terms and fees, and fixed payment.
Answer:
C.line of credit
Explanation:
An object is thrown upwards with a velocity of 15 m/s. How long will the ball take to reach it’s starting point ?
Answers
Answer:
about 2s or 3s,
Explanation:
15 m/s - 9.8 m/s = 5.2 m/s (1 sec)
5.2 m/s - 9.8 m/s = -4.6 m/s (2 sec)
if temperature is constant, the relationship between pressure and volume is
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Answer: inversely proportional
Explanation:
The Sankey diagrams below show the energy transfers in two light bulbs. What is the efficiency of light bulb 2? Give your answer to the nearest 0.5 percent
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Answer:
Divide the useful energy by the total energy and you will get the efficiency which should be between 0 and 1. Multiply by 100 to find the percentage efficiency.
Explanation:
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Susan can row a boat at 4.0 m/s in still water. While trying to row
directly across a river from west to east, Susan is pulled by a current
flowing southward at 3.0 m/s. How fast does Susan row relative to the
shore?
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The velocity of Susan's boat relative to the offshore when she encountered the water current is 5 m/s.
The given parameters;
Velocity of the Susan's boat in still water, Vb = 4 m/sVelocity of the water current, Vw = 3 m/sThe velocity of Susan's boat relative to the offshore when she encountered the water current is calculated as follows;
[tex]V_{b/o} ^2 = V_b^2 + V_w^2\\\\V_{b/o} = \sqrt{V_b^2 + V_w^2} \\\\\V_{b/o} = \sqrt{4^2 + 3^2}\\\\V_{b/o} = 5 \ m/s[/tex]
Thus, the velocity of Susan's boat relative to the offshore when she encountered the water current is 5 m/s.
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HELP PLEASEE VERY URGENTT !! POINTS WILL BE GIVENN
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Answer:
D
Explanation:
Trong chân không khi hai điện tích cách nhau lần lượt là d và d+10cm thì lực tương tác điện giữa chúng có độ lớn tương ứng là 2.0-6 N và 5.10-7 N tính giá trị của d
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Answer:
H2O is also known as for water
The temperature decreases 5°C in one hour and then decreases another 3°C in the next hour. Does this fit the definition of weather? Why or why not?
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The temperature decreases 5°C in one hour and then decreases another 3°C in the next hour fits the description of weather.
What is Weather?This is defined as the atmospheric condition of a place within a short period of time and is influenced by a lot of factors in the environment.
In this scenario, the temperature was taken every hour which is a short period of time and is thereby denoted as weather.
On the other hand, climate is the condition of a place over a long period of time which is usually up to a year which is why weather fits the definition provided.
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i am asking this question again because the quality of the pictures. answer the following 2 questions :)
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what is the frequency of a wave that has a wavelength of 3m that is traveling at a speed of 9m/s
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Answer:
3 m/s
Explanation:
Hunger and thirst are examples of external stimulus true or false
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Hunger and thirst are examples of external stimulus true or false
false External stimulus. The external stimulus includes touch and pain, vision, smell, taste, sound, and balance (equilibrium)
When there is a horizontal wire, the needle of a compass placed beneath the wire comes to rest at right angles to the wire, pointing from left to right. In which direction will the compass needle point if it is held above the wire ? Explain your answer.
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Explanation:
Imagine a conducting wire lying on top of the page with a current going from left to right. This current produces a magnetic field of closed field lines concentric around the wire coming out of the page above the wire and going into the page below the wire. When you put your compass above the wire, the needle will align with the magnetic field pointing out of the page, Moving the compass to below the wire the needle will flip 180 degrees and now point into the page. I don’t want to begin the discussion of north and south poles, etc. Just know that the compass needle will turn 180 deg.
pls help the image is down below
Answers
Answer:3 go to 2 and 4 go to 4 and 1 go 2 2 go to 1
Explanation:
You used a telescope and other mathematics to discover that Jupiter is 5. 20 au from the sun. Use the equation to find its orbital period. Round to the nearest tenth of a year. Jupiter’s Orbit: years.
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The second one is 9.55
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A race car traveling at 10 meters per second accelerates at a rate of 1.5 meters per second squared while travelling a distance of 600 meters. The final speed of the race car is approximately
Answers
Answer: 44m/s
Explanation:
A 400g ball moving toward the east at 3.7m/s suddenly collides head-on with a 200g ball sitting at rest. Determine the velocity of the first ball just after collision
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The final velocity of the first ball after the collision is 1.167 m/s to the west.
The given parameters;
mass of the moving ball, m₁ = 400 g = 0.4 kgvelocity of the moving ball, u₁ = 3.7 m/smass of the ball at rest, m₂ = 200 g = 0.2 kgLet the velocity of the first ball after collision = v₁
Let the velocity of the ball at rest after collision = v₂
Apply the principle of conservation of linear momentum;
[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2\\\\0.4(3.7)+ 0.2(0) = 0.4(-v_1) + 0.2v_2\\\\1.48 = -0.4v_1 + 0.2v_2[/tex]
Apply one-directional velocity formula;
[tex]u_1 + v_1 = u_2 + v_2\\\\3.7 - v_1 = 0 + v_2\\\\v_2 = 3.7 -v_1[/tex]
substitute the value of v₂ into the above equation;
[tex]1.48 = -0.4v_1 \ + \ 0.2(3.7 -v_1)\\\\1.48 = -0.4v_1 + 0.74 - 0.2v_1\\\\0.74 = -0.6v_1\\\\v_1 = \frac{-0.74}{0.6} \\\\v_1 = -1.167 \ m/s[/tex]
[tex]v_2 = 3.7 + 1.167\\\\v_2 = 4.867 \ m/s[/tex]
Thus, the final velocity of the first ball after the collision is 1.167 m/s to the west.
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A chemical lab isolates a gaseous element from the atmosphere that does not form chemical compounds. In which group of the periodic table is this element most likely found?
A. 18
B. 17
C. 1
D. 2
Answers
Answer:
A- 18
Explanation:
It wont let me explain how
what is angle of dip?
Answers
Answer:
The angle of dip is called the magnetic dip.
Explanation:
It is defined as the angle which is made by the earth's magnetic field lines with the horizontal. When the component that is horizontal and the vertical component of the earth's magnetic field are equal the angle of dip is equal to 45°.
Answer: Angle of dip is also known as the magnetic dip and is defined as the angle that is made by the earth’s magnetic field lines with the horizontal.
The angle of dip varies from point to point by providing the information related to the movement of the earth’s magnetic field. The angle of dip is said to be positive when the magnetic field points downwards. When the magnetic field points upwards, the angle of dip is said to be negative.
The angle of dip is 0° when the dip needle rests horizontally while the angle of dip is 90° when the dip needle rests vertically.
When the horizontal component and the vertical component of the earth’s magnetic field are equal, the angle of dip is equal to 45°.
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what happens as a result of an increase in the intensity of a sound wave?
A. the frequency of the sound wave increases.
B.the velocity of the sound wave decreases
C. the energy of the sound wave increases
D. the amplitude of the sound decreases
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As the intensity increases the energy increases.
Answer:
C. the energy of the sound wave increases
why does an elliptical galaxy look like one giant star
Answers
Explanation: An Elliptical galaxy looks like one giant star because the stars in the elliptical galaxy are often close together, making the center seem to be one giant star.
Hope this helps
Solve the science problem
Answers
Answer:
What is the problem I cant help unless you have the problem.
Explanation:
Answer:
what is the science problem??
are dimensionless quantities always unitless
Answers
Important thing is that all unitless quantity is dimensionless quantity. .A dimensionless physical quantity may have an unit
Lichens are not single organisms, but algae and fungi that function together. The algae use photosynthesis to make food for both organisms. The fungi produce digestive chemicals and absorb nutrients for both organisms. How does the biological activity of lichens cause weathering in rocks? Answer options with 4 options A. Lichens cause friction as they grow, which weathers the rocks. B. Lichens produce chemicals, which dissolve and weather the rocks. C. Lichens take in water, which freezes in cracks and weathers the rocks. D. Lichens absorb heat during photosynthesis, which weathers the rocks.
Answers
Answer:
The correct answer is B
Lichens produce chemicals which dissolve and weather the rocks.
different between clinical And laboratory thermometer.give me 4 points of each
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The lifecycle of a star, including the sun, is controlled by the blank of the star. A. Ending mass B. Ending density C. Initial density D. Initial mass
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What could have happened to Earth's ozone layer without the Montreal Protocol?
Answers
Answer:
Plants all around the world would have withered and wilted without the Montreal Protocol, according to a study published this week in the journal Nature. Many of them would have died and disappeared altogether. They would have been zapped by the harmful UV rays piercing through the planets damage ozone layer.
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When you learn to lift weights with the proper body mechanics, good form becomes a habit.
A.
True
B.
False
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Answer:
when you learn to lift weights with the proper body mechanics good form becomes a habit It's true
A group of students is investigating whether wheels affect the force of friction. The students push two boxes each with the same force on a table. One box has wheels and the
other does not have wheels. The distance traveled by each box is shown.
Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by box with wheels
24 cm
22 cm
20 cm
23 cm
Distance traveled by box without wheels
12 cm
14 cm
15 cm
13 cm
Which step should the students take next?
Make a hypothesis
Test another variable
Analyze the results
Share their conclusion
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analyze the results
