Answer:
Isolated or Closed system, both are correct
Multiple choice: Sunspots appear dark because
(a) they are patches of the photosphere that occasionally burn up, creating soot;
(b) the changing magnetic polarity of the Sun causes gas in the sunspot to cool down substantially;
(c) they are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere;
(d) they are much hotter than the surrounding area, so their emission peaks at ultraviolet wavelengths, which our eyes cannot see; or
(e) they are holes in the photosphere through which the cooler interior of the Sun is visible.
Answer: C. They are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere
Explanation:
Sunspots appear dark because they are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere.
Sunspots are typically cooler than their surroundings. For example, the temperature of a large sunspot can be about 4,000 Kelvin which is lower than the temperature of the photosphere around it which is about 5,800 Kelvin.
Think Critically Suppose your teacher gave you a slide of an unknown cell. How would you tell whether the cell was from an animal or from a plant?
Answer:
You will be able to tell whether the unknown cell is from an animal or from a plant through the knowledge of difference between plants and animal cells.
Explanation:
A cell can be defined as the simplest bit of living matter which exhibits a variety of shapes and sizes and that can exist independently.
When a slide of an unknown cell is studied under a microscope, different cell structures would be observed which would be used to conclude if the cell on the slide is a plant or animal cell.
The following features are observed in a plant cell:
--> cellulose cell wall is present
--> Chloroplast is present
--> A large central vacuole is present
--> Centriole is absent
The following features are observed in animal cell:
--> Cellulose cell wall is absent
--> Chloroplast is absent
--> Small vacuoles is present
--> Centriole is present
The difference between a plant and an animal cell can be seen from the features above and a clear knowledge of this will help the student tell whether the unknown cell is from an animal or from a plant.
A student analyzes the data and concludes that one bird flies at a speed of 20 meters per second during a portion of its migration. Select the two types of data that the student needed to form this conclusion
Answer:
The answer is "The location of the bird and time interval between pieces of information".
Explanation:
Please find the complete question in the attached file.
The Radar is the instrument used to gather data from birds by researchers. This would be the primary tool to study the flight behavior of migrating birds with the impact of environmental influences including the ecology of migratory movements, from the broad population group for both the distribution of land areas and geomorphology as well as meteorological systems to the shift in the behavior of airlines of particular birds, especially when responding to lead routes.
Two men push a bobsled with a total force of 250 Newtons. The
combined mass of the men and the bobsled is 230 kilograms.
Ignoring friction, what is the acceleration of the bobsled??(
F = ma)
Answer:
[tex]0.78m \: per {s}^{2} [/tex]
Which of the five themes of geography would a person most likely use to study the importation of Chinese goods into the United States?
A.
places and regions
B.
movement
C.
human systems
D.
physical systems
If an equation is balanced,it demonstrates the law of conservation of mass
True or False
Answer: True
Explanation:
Please help!!!
The Ice cube melting on the conducting plate
What is the main type of thermal energy...
. Conduction
.Convection
. Radiation
Answer:
conduction, convection, and radiation
Explanation:
when you hold an ice cube, heat is transferred from your warm hand to the cold ice and melts it. Your hand feels cold because it is losing heat energy. There are three ways that heat can be transferred: by conduction, convection, and radiation. heat through solids.
4
Students are using an air rocket to investigate the relationship
between force and an object's motion.
Students pump air into the rocket, then release the rocket, and the
compressed air pushes the rocket upward.
A. The length of the hose attached to the pump
B. The distance traveled by the rocket
C. The amount of air pumped into the rocket
D. The height of the rocket from fins to cone
If the car goes exits a freeway and goes from 65
mph to 35 mph is it accelerating?
Answer:
No, the car is decelerating
Explanation:
No the car is decelerating if it exits a freeway and goes from 65
mph to 35 mph since the change in velocity is negative.
change in velocity = final - initial
change in velocity = 35 - 65
change in velocity = -30mph
Since the change in velocity is negative, hence the car is decelerating. Deceleration is a negative acceleration
2. A hanging wind-chime on a calm day would have kinetic or potential energy?
kinetic
potential
Answer:
it would have potential energy
Calculator
What is the value of x?
Enter your answer in the box.
Х
24
x =
7
2
3
4 5 6 7 8
9
Answer:
25
Explanation:
By Using Pythagoras Theorem,
h^2=p^2+b^2
or, x^2=(24)^2+7^2
or, x^2=576+49
or, x^2=625
or, x=√625
•°• x=25
The value of x in this figure is 25.
What is Pythagorean theorem ?
Pythagorean theorem is applicable to only right angle tringle. it is defined as square of the hypotonias is equal to the square of sum of base and height.
i.e. hypotonias² = base² + height².
In this figure given values are,
Base = 7
Height = 24
hypotonias x = ?
according to Pythagorean theorem,
hypotonias² = base² + height²
hypotonias² = 7² + 24²
hypotonias² = 625
hypotonias = 25
Hence the value of x is 25.
To know more about Pythagorean theorem click :
https://brainly.com/question/14930619
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Find the electric field a distance z above the midpoint between equal and opposite charges,a distance d apart
Answer:
Ex = [tex]2 k q \frac{x}{(x^2 + z^2) ^{3/2}}[/tex] , E_z =0
Explanation:
To find the electric field of each charge, let's use
E = k q / r²
where the field for a positive charge is outgoing and for a negative charge it is incoming.
Since the electric field is a vector magnitude, let's add its components at the point z
X axis
Eₓ = E₁ₓ + E₂ₓ
Eₓ = 2 E₁ₓ
Z axis
E_z = E_{1z} -E_{2z}
E_z= 0
Let's find the expression for the electric field
the distance from the charge to the test point, using the Pythagorean theorem is
r² = (x-0) ² + (0-z) ²
E = [tex]k \frac{q}{x^2 + z^2}[/tex]
with trigonometry we can find its components
cos θ = E₁ₓ / E
E₁ₓ = E cos θ
we substitute
Eₓ = 2 E cos θ
where the cosine
cos θ = x / r
Ex = [tex]2 k \frac{q}{x^2 + z^2} \ \frac{x}{\sqrt{x^2 + z^2} }[/tex]
Ex = [tex]2 k q \frac{x}{(x^2 + z^2) ^{3/2}}[/tex]
E_z = 0
Expresa en notación científica los siguientes números en notación científica estándar: a) 9367421= b) 7241= c) 0.0005519= d) 0.02=
Answer:
so yeah it is Respuesta
Which of the following organs are found in the
lower gastrointestinal tract? Check all that apply.
answers are above
Answer:
small intestine, tongue and large intestine
Explanation:
The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.
what made the dinosaurs instinct
Answer:
Eruptions/Volcano
Explanation:
poop fell from the sky
35) Kinetic energy in flowing water drives
A watermill. B. windmill
to generate electricity.
C. turbines. D. generator
Answer:
C) Turbines
Explanation:
C. because as the water flows, its kinetic energy is used to turn a turbine.
michael's house is 5.0 km away from his school. How long would it take him to go ti school, riding a bus, if its velocity is 25 km/h?
Pleaseee answer correctly
I mark brainliest who answer this
Answer:
12 mins
Explanation:
The distance covered is 5 km, divide this by 25 to get the fraction of an hour it takes. Doing this you get .2, times this by 60 min (1 hour) to get how many mins it takes
Which statement best describes the difference between atoms and molecules
Answer:
Atom
It is a smallest component of element.
may or maynot have possessed.
Molecule
it is a group of two or more Atoms.
alway posses the properties of matter.
The components of vector A are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A?
Answer: [tex]314.28^{\circ}[/tex]
Explanation:
Given
X component of the vector is [tex]A_x=3.9[/tex]
Y component of the vector is [tex]A_y=-4[/tex]
From the figure, we can write
[tex]\Rightarrow \tan x=\dfrac{4}{3.9}\\\\\Rightarrow x=45.72^{\circ}[/tex]
Thus, the angle measured counterclockwise from the x-axis to vector A is
[tex]360^{\circ}-45.72^{\circ}=314.28^{\circ}[/tex]
GIVING BRAINLIEST PLEASE HELP ME!!!
-If you answer correctly ill give you brainliest which will give you 25 points-
Answer:
Explanation:
1. Conduction
2. Convection
3. Radiation
A driver starts his parked car and within 4.6 seconds, reaches a velocity of 15 m/s. What is his acceleration?
Determine both the mass and the charge of a block of material consisting of 3 x 10^27 protons, 3 x 10^37 neutrons, and 3.1 x 10^27 electrons.
Answer:
The mass of the block of material is 3 x 10³⁷ g/mol
The charge of the material is 4.8 x 10⁸ C
Explanation:
Given;
number of protons of the material, P = 3 x 10²⁷
number of neutrons in the material, N = 3 x 10³⁷
number of electrons in the material, E = 3 x 10²⁷
The mass of the block of material is calculated as follows;
M = P + N
M = 3 x 10²⁷ + 3 x 10³⁷
M = 3 x 10³⁷ g/mol
The charge of the material is calculated as follows;
charge of 1 electron = 1.6 x 10⁻¹⁹ C
charge of 3 x 10²⁷ electrons = 3 x 10²⁷ electrons x 1.6 x 10⁻¹⁹ C
= 4.8 x 10⁸ C
HELP ASAP Which statement describes the water particles when condensation takes place?
A. The particles gain heat energy and move closer to each other
B. The particles lose heat energy and move closer to each other
C. The particles gain heat energy and move away from each other
D. The particles lose heat energy and move away from each other
please help me answer
D. 55 Kg mass moving at 1 m/s, is the correct answer.
The more mass the object has, the greater inertia is. It doesn't matter how fast the object is going because inertia is depended on mass.
A jet plane travels east for
661.8 meters in 6 seconds.
What is the velocity of the plane?
velocity = distance = time
3,970.8
Explanation:
v=661.8×6
3,970.8
Light waves travel at 3 × 10 8 m/s. If the light wave has a particular wavelength of 400 nm (400 × 10 –9 m), calculate its frequency.
Answer:
[tex]f=7.5\times 10^{14}\ Hz[/tex]
Explanation:
Given that,
The wavelength of light, [tex]\lambda=400\ nm=400\times 10^{-9}\ m[/tex]
The speed of light, [tex]c=3\times 10^8\ m/s[/tex]
We need to find the frequency of light. We know that,
[tex]c=f\lambda[/tex]
Where
f is the frequency
So,
[tex]f=\dfrac{c}{\lambda}\\\\f=\dfrac{3\times 10^8}{400\times 10^{-9}}\\\\f=7.5\times 10^{14}\ Hz[/tex]
So, the frequency of light is [tex]7.5\times 10^{14}\ Hz[/tex].
If the radius increased between the two objects what would happen to gravitational force between them?
Answer:
The Gravitational Force would decrease
Explanation:
The equation Gm1m2/r^2 is the equation for gravitational force. If you look, as we increase the radius, the overall value will decrease as we move further apart.
Waldo needs to know how much force to apply in order to move a 4000-kg object at 2 m/S2. Which law should he refer to
Answer:
Newton's second law of motion?
HELP PLS
Explain what happens when two light waves travelling from the same direction of displacement meet.
Answer:
When two light waves traveling from opposite directions meet they experience wave interference. This happens when they are traveling along the same medium!
Explanation:
Hope it help! (Please mark brainliest!)
How do food molecules compare to each other?