Proxima Centauri and the Sun are both main-sequence stars, but Proxima Centauri is a red dwarf and the Sun is a yellow dwarf. Based on the information you charted, compare the characteristics of red dwarf stars and yellow dwarf stars.
Answer:
Yellow dwarfs are small, main sequence stars. The Sun is a yellow dwarf. A red dwarf is a small, cool, very faint, main sequence star whose surface temperature is under about 4,000 K. Red dwarfs are the most common type of star. Proxima Centauri is a red dwarf.
Explanation:
Answer:
Red dwarfs are low-mass main-sequence stars. Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun.
Explanation:
50 POINTS & RLLY EASY
Which planet has the features that best describe Mars?
Select one:
A.
-has a lower density than liquid water
- circled by many rings, which are made of light and dust that reflect light easily
- second largest planet in the solar system made of gas and rock
b. has landforms made by flowing liquid water
- has many huge on its surface
- gets its red color from iron oxide present in soil and rocks on surface
- reflects light from sun
c.
- largest and most massive planet in the solar system
-has a huge permanent storm that looks like a red spot in images
- has at least 61 moons orbiting it, some of which are very large
- located closer to the sun than Kuiper Belt
d.
- methane in the atmosphere gives planet a blue-green color
- poles are oriented almost parallel to the planet's orbit
- poles experience constant daylight or darkness for 48 years at a time
- located in our solar system
Answer:
b. has landforms made by flowing liquid water
- has many huge on its surface
- gets its red color from iron oxide present in soil and rocks on surface
- reflects light from sun
Explanation:
what is motion and explain also
Answer:
the action or process of moving or being moved.
Explanation:
In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.
Please help!!!!!!!!!!!!! :((
Answer:
A.......................
Answer:
the answer you're looking for is A
Which element is located in period 3 of the periodic table?
A. He
B. K
C. C
D. Al
Answer:
From the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.
Explanation:
We know that the 3rd period contains 8 elements which are as follows:
sodiummagnesiumaluminiumsiliconphosphorussulfurchlorine, and argonThe sodium and magnesium, the first 2 elements, are members of the s-block of the periodic table, while the rest of the members are the elements of the p-block.
Thus, from the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.
To what extent do covalent compounds conduct electricity?
O always
O usually
O rarely
O never
Answer:
never....(D)
Explanation:
hope this helps, the person above me is also correct
Covalent compounds never conduct electricity as we know that these compounds are formed by the sharing of electrons where free electrons are unavailable for the flow of the electric current.
Therefore the correct answer is option D.
What is a covalent bond?Covalent bonds are formed between two atoms, whether they are similar or different when they share an extra electron.
The transport of electrons produces the ionic bond.
Intermolecular compounds are known to never carry electricity because they are created by shared electrons, which prevents free electrons from being available for the transmission of an electric current.
Option D is the right response as a result.
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A company has been in business for 40 years. It has tens of thousands of customer addresses in three different computer systems and written on paper in filing cabinets. Which of these people would be MOST helpful in organizing and securing this information?
A.
database administrator
B.
operations research analyst
C.
computer network support specialist
D.
computer user support specialist
The person in charge of information management is the database administrator.
What is a database?The term database refers to the arranging of the data that concerns clients in relevant entry point such as computers and file cabinets. This is the way by which companies are bale to keep track of their customers.
The person that is most helpful in the management of the tens of thousands of customer addresses in three different computer systems and written on paper in filing cabinets is the database administrator.
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What is the impact of age on flexibility? A. Younger people tend to develop flexibility more slowly. B. Younger people tend to be more flexible. C. Older people tend to be more flexible. D. Older people cannot maintain their flexibility.
Answer:
the answer is b
Explanation:
Calculate the force between two objects that have masses of 70 kilograms and 2,000 Kilograms separated by a distance of 1m
Answer:
The gravitational force between two objects = F = 9.3 x 10⁻⁶ N
Explanation:
Given
m₁ = 70 kg
m₂ = 2000 kg
distance r = 1 m
Thus, the gravitational force between two objects = F = Gm₁m₂ / r²
as
Gravitation constant = G = 6.67430×10⁻¹¹ N⋅m²/kg²
Thus, putting the values
F = Gm₁m₂ / r²
= (6.67430×10⁻¹¹ × 70 × 2000) / 1²
= 9.3 x 10⁻⁶ N
Thus, the gravitational force between two objects = F = 9.3 x 10⁻⁶ N
7. A 1.5 N force is applied to an air hockey puck with a mass of 0.10 kg. With what
acceleration does the puck move across the air table?
Answer:
15m/s²
Explanation:
According to Newton's second law;
Force = mass * acceleration
Given
Force = 1.5N
mass = 0.10kg
Required
acceleration
Substitute into the expression;
1.5 = 0.1a
a = 1.5/0.1
a = 15m/s²
Hence the acceleration that the puck move across the air table is 15m/s²
A iron crowbar weighing 85 N is lying on the ground. What force is required to lift one end of it?
Answer:
F L = W * L/2
F = W / 2 = 42.5 N
The crowbar is uniform and can be replaced by a point mass of 85 N at distance of L/2 and the applied force is at a distance of L
All BUT ONE statement provides evidence supporting plate tectonics, through data collected at the sites of sea floor spreading. That is
All BUT ONE statement provides evidence supporting plate tectonics, through data collected at the sites of sea floor spreading. That is... paleomagnetic reversals in specific areas of the sea floor.
Paleomagnetism, often known as palaeomagnetism, is indeed the study of magnetic field records found in rocks, silt, and other prehistoric materials. When magnetic minerals occur in rocks, they may record the strength and direction of the magnetic field.
Hence, paleomagnetic reversals in specific areas of the sea floor, Paleomagnetism is related to mid-ocean ridges since it is among the most trustworthy techniques for scientists to make a magnetic history of the evolution of the Earth's magnetic field. New rock is continuously formed at an ocean's bottom rift as a result of seafloor spreading.
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A barbel weighing 215N is raised to a height of 2.0 M above the ground. It is then dropped from that height.
A. What is the kinetic energy of the barbell as it hits the floor?
B. What is the velocity of the barbell as it hits the floor?
Answer:
430 J6.26 m/sExplanation:
A. The kinetic energy is the same as the initial potential energy:
PE = mgh = (215 N)(2.0 M) = 430 J
__
B. The velocity achieved by falling from a height h is given by ...
v = √(2gh)
v = √(2·9.8 m/s^2·2 m) = √(39.2 m^2/s^2)
v ≈ 6.26 m/s
A hollow copper tube carries a current along its length. Why is B=0 inside the tube? Is B nonzero outside the tubes
Yes, because B=0 inside the tube so, B is non-zero outside the tubes.
Explain cylindrical symmetry?A surface or solid of revolution exhibits circular symmetry around an axis in three dimensions. This property is also known as cylindrical symmetry or axial symmetry.
Apply Ampere's law to the circle in the image with the number 1 on it. The magnetic field inside the tube must be zero because the current has a cylindrical symmetry about its central axis, which causes the line integral to reduce to the magnetic field's strength times the path's circumference.
However, this is equal to zero because there is no current flowing along this path. On the other hand, if the conductor's current is the current flowing through channel 2, the line integral will not equal zero, indicating that there is a magnetic field outside the tube.
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1a. for the free body diagram below, are the forces balanced or unbalanced?
Answer:
i think its unbalance because one side has 25 newtons and the other is 20 newtons there not the same
An earthquake can produce a seiche in a lake in which the water sloshes back and forth from end to end with remarkably large amplitude and long period. Consider a seiche produced in a farm pond. Suppose the pond is 9.15 m long and assume it has a uniform width and depth. You measure that a pulse produced at one end reaches the other end in 2.50s. (b) What should be the frequency of the ground motion during the earthquake to produce a seiche that is a standing wave with antinodes at each end of the pond and one node at the center?
The frequency of the ground motion is 0.2 Hz
What should be the frequency of the ground motion during the earthquake to produce a seiche that is a standing wave with antinodes at each end of the pond and one node at the center?The frequency of the ground motion f = 1/T where T = period of ground motion.
Now, the pond is 9.15 m long and assume it has a uniform width and depth. You measure that a pulse produced at one end reaches the other end in 2.50s.
Since this is a standing wave with antinodes at each end of the pond and one node at the center, we have that the distance between two antinodes is half the wavelength.
Also, the time between two antinodes is half the period.
So, t = T/2
Now, since a pulse produced at one end reaches the other end in 2.50s, this is the time between both antinodes.
So, the period, T = 2t where t = time between antinodes = 2.50 s
So, T = 2t
= 2 × 2.50 s
= 5.0 s
Since the frequency of the ground motion f = 1/T substituting the value of T into f,we have
f = 1/T
= 1/5.0 s
= 0.2 Hz
So, the frequency of the ground motion is 0.2 Hz
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When you cook a steak, what kind of energy do you increase in the steak?
O A. Sound energy
OB. Thermal energy
O C. Nuclear energy
O D. Elastic energy
Answer:
B im pretty sure.
Explanation:
two skateboarders of mass 50 kg and 60 kg push each other with force 70N.what is the acceleration of each skaters
Answer:
0 m/s²
Explanation:
Since each skater pushes the other with a force of 70 N, according to Newton's third law, there is an equal reaction and thus the other pushes back with a force of 70 N in the other direction, so we have forces of +70N and -70 N respectively. So, the net force on each skateboarder is F = + 70 N + (-70 N) = + 70 N - 70 N = 0 N.
Since force, F = ma where a = acceleration and m = mass,
a = F/m.
So, since for each skater, F = 0N,
a = 0 N/m
= 0 m/s²
So, the acceleration of each skater is 0 m/s²
Which equation can be used to solve for acceleration?
t=v/a
vf=at-vi
a=d/t
v=a/t
Answer:
t=v/a
Explanation:
Acceleration is defined as the rate of change of velocity with time. It is mathematically expressed as;
Acceleration = [tex]\frac{Final velocity - Initial velocity}{time}[/tex]
The change in velocity per unit of time is the acceleration
From this equation;
time = [tex]\frac{change in velocity }{acceleration}[/tex]
This expression is analogous to the expression chosen.
2.
What can you infer by looking at the electromagnetic spectrum (see image)? please get it right :(
A car starts from rest and accelerates at 4 m/s2 until it reaches 36 m/s. How far did it travel in this time?
The distance of a car that starts from rest and accelerates at 4 m/s² until it reaches 36 m/s is 162m.
How to calculate distance?The distance moved by a body can be calculated using the following formula:
S = ut + ½at²
Where;
S = distanceu = initial velocityt = timea = accelerationHowever, the time taken for the car to complete the acceleration can be calculated as follows:
4 = 36/t
t = 9seconds
S = 0 × t + ½ × 4 × 9²
S = 0 + 162
S = 162m
Therefore, the distance of a car that starts from rest and accelerates at 4 m/s² until it reaches 36 m/s is 162m.
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a 87 kg block is pulled across the table by the horizontal force of 43N with a fictional force of 7.3 opposing the motion calculate the acceleration of the object
Answer:
a = 0.41 [m/s²]
Explanation:
To solve this problem we must use Newton's second law which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = force [N]
m = mass = 87 [kg]
a = acceleration [m/s²]
The frictional force will be taken as negative, since it opposes the movement of the block.
[tex]43-7.3 = 87*a\\35.7 = 87*a\\a=0.41[m/s^{2} ][/tex]
A tuning fork is known to vibrate with frequency 262Hz. When it is sounded along with a mandolin string, four beats are heard every second. Next, a bit of tape is put onto each tine of the tuning fork, and the tuning fork now produces five beats per second with the same mandolin string. What is the frequency of the string? (a) 258Hz (b) 258Hz (c) 262Hz (d) 266 Hz (e) 267 Hz
The supplied tuning fork has a frequency of 262Hz.
A recurring event's frequency is measured by how many times it occurs in a unit of time. To emphasize distinctions with spatial and angular frequencies, respectively, it is also sometimes referred to as ordinary frequency or temporal frequency.
Additionally, it is claimed that when it is played on a mandolin, four beats can be heard every second.
Together, the beats produced by a vibrating mandolin string and tuning fork are referred to as beat frequencies.
Frequency of beat= Frequency of tuning fork + Frequency of mandolin string
Given that a tuning fork's frequency is 262 Hz
String frequency equals 4 beats per second (4Hz).
Therefore, Frequency of beat = 262Hz +4 Hz = 266Hz
Hence, the correct answer for the given question is option (D) 266Hz
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The boat moves forward due to A. a forward thrust from the propeller that is greater than the backward force of the water current. B. a forward thrust from the propeller that is equal to the backward force of the water current. C. a backward thrust from the propeller against the water that is greater than the force of gravity. D. a backward thrust from the propeller against the water that is less than the force of gravity.
Answer:
(B). a forward thrust from the propeller that is equal to the backward force of the water current.
Explanation:
A boat generates thrust when the propellers are turned to accelerate water forward. According to Newton's third law, the resulting thrust pushes the boat in the opposite direction (i.e. backward direction) which is equal in magnitude.
So, the boat moves forward due to a forward thrust from the propeller that is equal to the backward force of the water current.
Hence. option (B) is correct.
Which of the following situations has more kinetic energy than potential energy?
Answer: I think its C
Explanation:
Answer:
a rolling bowling ball
Explanation:
a rock at the edge of a cliff, an archer’s bow that is drawn back, a rolling bowling ball, a car waiting at a red light
moving is kinetic energy a rolling bowling ball is the only one with movement
If an equation is already balanced, how would you express that in an answer?
A. Write 'balanced as written.'
B. Add a tick next to it.
C. Do not write anything next to it.
Answer:
C. Do not write anything next to it.
Explanation:
If an equation is already balanced there is no need to provide information of that.
Glands in the body send out chemical messages through hormones to control growth, development, and metabolism. The system that helps regulate the body to maintain homeostasis is the-
Answer:
The nervous and endocrine systems exert the ultimate control over homeostasis because they coordinate the functions of the body's systems.
Explanation:
At extreme position, velocity is zero but acceleration is maximum in SHM.how can you theoretically explain it?
At extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because of maximum displacement of pendulum.
Why acceleration is maximum when velocity is zero in SHM?At extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because at extreme points the motion of the pendulum is at zero which means that velocity is zero but the pendulum attains maximum displacement. Acceleration is maximum when it gets the extreme position because the displacement is maximum at extreme position. If the velocity of the simple harmonic motion is maximum, the acceleration must be equal to zero and we know that the acceleration is equal to zero only when the particle or object is at initial position.
So we can conclude that at extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because of maximum displacement of pendulum.
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a pitcher throws a .015 kg baseball from rest to a final velocity of 45. what is the magnitude of the change in momentum of the baseball
Answer:
0.675 kg m/s
Explanation:
Momentum = mass x velocity
= 0.015 x 45 = 0.675 kg m/s
P.S. I'm not sure of this answer, so it might be a good idea to check this with some other sources.
Change in momentum = 0.675 kg m/s
What is momentum ?
Momentum is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity
change in momentum = final momentum - initial momentum
final momentum = m*v = 0.015 * 45 = 0.675 kg m/s
initial momentum = m* v = 0.015 * 0 = 0
change in momentum = 0.675 kg m/s
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4 Generators are used to convert chemical energy into electrical energy. One company
that designs generators claims that their newest design can convert 1,000 joules of
chemical energy into 1,200 joules of electrical energy. What conclusion can you draw
about this company's design?
A No conclusion can be drawn without more information.
B It has a very good and realistic efficiency.
C It is impossible to convert chemical energy into electrical energy.
D It is impossible to create more energy than was input.
Answer:
fg
Explanation:
bbjtvnjj