Answer:
When you throw something up like a glass cup for example, it falls down and breaks, that is because of gravitational force
Explanation:
THE CUP BREAKS BECAUSE OF THE DOWN FORCE
40 POINTS PLEASE ANSWER ALL CORRECTLY
Question 1 (10 points)
The flow of electrons through wires and components is known as:
Question 1 options:
Particle Current
Static Electricity
Electric Current
Positive Current
Question 2 (10 points)
The current flows from the positive terminal to the negative terminal of a cell such as in a battery.
Question 2 options:
True
False
Question 3 (10 points)
The two main types of circuits are:
Question 3 options:
Parallel and Current
Series and Parallel
Series and Current
Series and Component
Question 4 (10 points)
The type of circuit in which there is only one path for an electric current to flow is known as a _____ circuit.
Question 4 options:
Component
Parallel
Series
Light
Question 5 (10 points)
Which type of circuit would allow an electric current to continue to flow even if a single path is broken?
Question 5 options:
Series
Parallel
Open
Box
Question 6 (10 points)
Which diagram is an example of a series circuit?
Question 6 options:
Neither
Diagram B
Diagram A
Question 7 (10 points)
Four 3-Ω resistors placed in series would provide a resistance that is equivalent to one _____-Ω resistor.
Question 7 options:
3
6
9
12
Question 8 (10 points)
The purpose of fuses and circuit breakers is to
Question 8 options:
protect equipment by allowing more electric current through
protect equipment by stopping the flow of electric current
cause damage to equipment by allowing more electric current through
cause damage to equipment by stopping the flow of electric current
Question 9 (10 points)
The following symbol is used to represent ____ in a circuit diagram.
Question 9 options:
cell
switch
lamp
wires
Question 10 (10 points)
The purpose of a cell (battery) is to:
Question 10 options:
store chemical energy only when a circuit is connected
store chemical energy and transfer it to thermal energy when a circuit is connected
release chemical energy and absorb thermal energy when a circuit is connected
store chemical energy and transfer it to electrical energy when a circuit is connected
Answer:
1. Electric current
2. In fact it is electrons that flow through a metallic conductor, and they flow from the negative terminal to the positive terminal
3. Series and parallel
4. Series
5. Parallel
6.
7.
8.A fuse is a small, thin conductor designed to melt and separate into two pieces for the purpose of breaking a circuit in the event of excessive current. A circuit breaker is a specially designed switch that automatically opens to interrupt circuit current in the event of an overcurrent condition.
9.
10. The power of batteries in a circuit. The key functions of a battery and bulb in a circuit are explained. A battery is a source of energy which provides a push - a voltage - of energy to get the current flowing in a circuit. A bulb uses the electrical energy provided by the battery, but does not use current.
The flow of electrons through wires and components is known as electric current.
What is meant by electricity ?Electricity is defined as a form of energy occurring naturally due to motion and interactions of electrons.
Here,
1. The flow of electrons through wires and components is known as electric current. Or simply, electric current is the rate of flow of charge.
2. Since, the electrons are attracted to the positive terminal of the battery, they move from the negative to the positive terminal of the battery.
The direction of conventional flow of current is taken opposite to the flow of electrons. Thus electric current flows from positive terminal to the negative terminal of the battery. So, it is true.
3. The two main types of circuits are series and parallel.
4. The type of circuit in which there is only one path for an electric current to flow is known as a series circuit.
5. The type of circuit would allow an electric current to continue to flow even if a single path is broken is a parallel circuit.
6. The diagram of a series circuit is attached.
7. R' = 3 Ω
The equivalent resistance of the 4 resistors,
R(eff) = 4R' = 4 x 3
R(eff) = 12 Ω
8. The purpose of fuses and circuit breakers is to protect equipment by stopping the flow of electric current.
9. The symbol represents the cell in a circuit diagram.
10. The purpose of a cell (battery) is to store chemical energy and transfer it to electrical energy when a circuit is connected.
Hence,
The flow of electrons through wires and components is known as electric current.
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Your question was incomplete. Attaching the image here.
Crucible
10.00 g
Crucible and hydrate before heating
15.32 g
Crucible and hydrate after first heating
15.10 g
Crucible and hydrate after second heating
14.65 g
Cindy and Blake performed and experiment in which they were evaporating water from a compound. Their teacher told them that the accepted value for the mass of water in the compound was 0.70 grams. Use the data from the table to calculate the percent error of their experiment.
A)
4.29%
B)
6.43%
C)
31.43%
D)
56.42%
Answer:
A) 4.29%
Percentage error is 4.29%
Explanation:
From the experiment results;
The mass of water = 15.32 g - 14.65 g
= 0.67 g
Therefore;
The percentage error in the experiment will be given by;
= (0.7-0.67)/0.7 × 100
= 0.03/0.7 × 100
= 4.29%
Which condition is necessary for total internal reflection? A. The refracted ray should lie along the boundary of the two media. B. The refracted ray should turn toward the normal. C. Light in a medium is incident on a boundary with a faster medium. D. Light in a medium is incident on a boundary with a slower medium.
There are two conditions necessary for total internal reflection, which is when light hits the boundary between two mediums and reflects back into its original medium:
Light is about to pass from a more optically dense medium (slower) to a less optically dense medium (faster).
The angle of incidence is greater than the defined critical angle for the two mediums, which is given by:
θ = sin⁻¹([tex]n_{fast}[/tex]/[tex]n_{slow}[/tex])
Where θ = critical angle, [tex]n_{fast}[/tex] = refractive index of faster medium, [tex]n_{slow}[/tex] = refractive index of slower medium.
Choice C gives one of the above necessary conditions.
Answer:
C. Light in a medium is incident on a boundary with a faster medium.
Explanation:
what happens to the resistance of a wire as its length increases
Answer:
Resistance increases with length because the electrons have further to go, so suffer greater collisions with atoms in the material. Look at these wires: Electrons moving through the short wire only feel resistance for a short time compared to the longer one. This means its resistance is less.
Explanation:
Answer:
A longer length leads to a higher resistance
Explanation:
Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction?
that would be given by
f=@N
@ representing coefficient of kinetic friction.
thus 19.5/51.7 = 0.377
What type of population density dependence focuses on abiotic factors
Answer:Density-independent factors, such as weather and climate, exert their influences on population size regardless of the population's density. In contrast, the effects of density-dependent factors intensify as the population increases in size.
Explanation:
Answer:
Density independent.
Explanation:
Many factors which are physical or chemical in nature can influence the mortality of a population. They are occur by the inclusion of weather, natural disaster and pollution. A deer may be died in a forest due to fire and its chances of survival depends on the quantity of population density whether its high or low.
Density independent regulation can be affected by the various factors that affects the death rate or birth rates such as environmental factor and abiotic factors.
At constant pressure, a sample of a gas occupies 420 ml at 220 K. what volume does the gas occupy at 250 K?
Answer:
480 mL
Explanation:
Ideal gas law states:
PV = nRT
At constant pressure, nR/P is constant. Therefore:
V / T = V / T
420 mL / 220 K = V / 250 K
V ≈ 480 mL
A technique in which people use machines to learn how to control their bodies is known as __________.
A.
meditation
B.
sleep
C.
hypnosis
D.
biofeedback
Answer:
The technique in which people use machines to learn how to control their bodies is known as D, Biofeedback.
Explanation:
Biofeedback is a variety of different machines that help people learn how to control their bodies depending on their specific needs, varying from things like scalp sensors, electrocardiographs, electromyographs and more.
Answer:
biofeedback
Explanation:
A toy train has an acceleration of 1.2 m/s2. A net force of 3.0 N is acting on the train. What is the mass of the train?
Answer:
2.5 kg
Explanation:
We can solve the problem by using Newton's second law:
[tex]F=ma[/tex]
where
F is the net force acting on the train
m is the mass of the train
a is the acceleration
For the toy train in the problem,
F = 3.0 N
a = 1.2 m/s^2
So we can solve the formula for m, to find the mass of the train:
[tex]m=\frac{F}{a}=\frac{3.0 N}{1.2 m/s^2}=2.5 kg[/tex]
Answer:
2.5
Explanation:
First to answer will be the brainliest
Answer:
medium. A medium is the intervening substance through which impressions are conveyed to the senses or a force acts on objects at a distance.
A train traveling at 18.2 m/s accelerates to 39.9 m/s over a distance of 1250 m. How long did it take the train to cover this distance?
Answer:
43.4 s
Explanation:
First of all, we can find the acceleration of the train by using the equation:
[tex]v^2 -u^2 = 2ad[/tex]
where
v = 39.9 m/s is the final speed
u = 18.2 m/s is the initial speed
a is the acceleration
d = 1250 m is the distance covered
Solving for a,
[tex]a=\frac{v^2-u^2}{2d}=\frac{(39.9 m/s)^2-(18.2 m/s)^2}{2(1250 m)}=0.50 m/s^2[/tex]
And now we can fidn the time taken, by using the formula:
[tex]a=\frac{v-u}{t}\\t=\frac{v-u}{a}=\frac{39.9 m/s-18.2 m/s}{0.50 m/s^2}=43.4 s[/tex]
Suppose a charge q=+50 uC experiences a force of 0.040 N which points to the right. What is the magnitude and direction of the electric field that causes this force?
Answer:
The magnitude of the electric field is 800 N/C and the direction is positive and points to the right.
Explanation:
Ok, here is the explanation:
The magnitude of the electric field is simply defined as the force per charge on the test charge:
[tex]electric field strength=\frac{force}{charge}[/tex]
If the electric field strength is denoted by the symbol E, then the equation can be rewritten in symbolic form as:
[tex]E=\frac{F}{q}[/tex]
and this is the equation we are going to use to solve the problem
We have: E=?, q=+50μC and F=0.040N
We know that 1C=1x10-6 μC so 50μC is equal to 5x10-5 C or 0.00005 C
Then we use the equation as follows:
[tex]E=\frac{0.040}{+0.00005} =800 \frac{N}{C}[/tex]
Because the charge is positive and also the force applied, so will the electric field. And since the force points to the right, the electric field as a vector points to the right.
If an airplane is moving at a constant speed of 500 miles per hour in a straight line is it accelerating?
You just said "constant speed", and "straight line" which means constant direction.
"Acceleration" means any change of speed or direction of motion. Since neither of those is changing, no acceleration is happening.
Acceleration is the rate of change of velocity. Constant velocity, means there is no change in velocity and hence the plane is not accelerating.
What is velocity?Velocity is a physical quantity used to measure the distance traveled per unit time. Thus, velocity is the ratio of distance to the time of travel. Velocity is a vector quantity and it is expressed in the units m/s, km/h, miles/hr, ft./s etc.
The rate of change of velocity is called acceleration. Acceleration is also a vector quantity thus having both magnitude and direction. As change in velocity per time difference is the acceleration and it is expressed in the unit m/s².
Here, the plane is moving through a straight line at a constant speed of 500 mph. Thus no change in velocity indicates the plane is not accelerating in any direction.
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Which of the following statements is true of sound transmission through various mediums?
Answer:
C
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The statements ‘Sound insulators prevent sound from being transmitted better than elastic solids' is true of sound transmission through various mediums.
Answer: Option C
Explanation:
The sound insulators are the better way to prevent sound from being transmitted than elastic solids as they have a higher tendency to absorb sound waves than the elastic solids. A good sound insulation is considered in the range of 45 dB.
Mineral wool, rock wool, fibreglass etc are the best to be fit in between the studs of the walls. They absorb the sound waves and help reducing the transmission of sound from the walls, windows, fences, etc.
Based on the free-body diagram, the net force acting
on this firework is
0N. The net force acting on this firework is 0.
The key to solve this problem is using the net force formula based on the diagram shown in the image. Fnet = F1 + F2.....Fn.
Based on the free-body diagram, we have:
The force of gases is Fgases = 9,452N
The force of the rocket Frocket = -9452
Then, the net force acting is:
Fnet = Fgases + Frocket
Fnet = 9,452N - 9,452N = 0N
Based on the free-body diagram, the net force acting on this firework is 0 Newton.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The mathematical expression for Newton's second law is as follows
F = m*a
where F represents the force applied
m is the mass of the object
a is the acceleration of the object
By using the equilibrium of the forces
The net horizontal forces acting on the firework should be zero.
as well the net vertical forces acting on the firework should be zero.
As there is no horizontal force acting on the rocket then the net horizontal force is already zero and has no significance in this problem.
Fh=0
For balancing the vertical force, the net vertical force on the firework is zero as both the upward force and downward force are equal in magnitude but opposite in direction.
Net vertical force= Net upward force - net downward force
= 9452-9452
=0 N
Thus, we can conclude on the basis of the free-body diagram, that the net force acting on this firework is 0 Newton.
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Look at the two wave diagram.Which best describes the difference between wave A and wave B
Answer:
B. Wave B has greater intensity and transfer more energy.
Explanation:
Amplitude of wave B is more and it seems to be compact in less period of time as compared to Wave A.
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A 1000kg car has a speed of 32m/s. If it takes 7s to stop the car, what is the impulse and the average force acting in the car
1) Impulse: -32,000 kg m/s
The impulse acting on the car is equal to the change in momentum of the car:
[tex]I= \Delta p = m (v-u)[/tex]
where in this problem we have
m = 1000 kg is the mass of the car
v = 0 m/s is the final velocity of the car
u = 32 m/s is the initial velocity of the car
Substituting values into the equation, we find
[tex]I=(1000 kg)(0-32 m/s)=-32,000 kg m/s[/tex]
2) -4751 N
The impulse exerted on the car is also equal to the product between the average force, F, and the duration of the collision, t:
[tex]I=Ft[/tex]
where in this situation we know
[tex]I=-32,000 kg m/s[/tex] is the impulse
t = 7 s is the duration of the collision
Solving the formula for F, we find the average force:
[tex]F=\frac{I}{t}=\frac{-32,000 kg m/s}{7 s}=-4,571 N[/tex]
and the negative sign means that the force is in the opposite direction to the motion of the car.
A 25-kg wagon has a momentum of 300kg m/s. What is it’s acceleration?
The answer is 12 ....
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A sound wave has a frequency of 250 Hz and a wavelength of 0.35 m?
1: Write out the equation
2: List out your known variables
3: Plug the numbers into the equations
4: solve
5: Write your solution statement that includes the answer with the units
Answer:
The frequency, f, is 250 Hz. Hz is cycles per second. Hence a number divided by seconds.
The wavelength, λ, is 1.5 m.
The speed is v. Which is frequency times wavelength.
v = f xλ
Hence 250Hz*1.5m= 375 meters per second or 375 m/s
Explanation:
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Explanation:
The expression for the speed of the sound in terms of frequency and the wavelength is as follows;
[tex]v=\nu \lambda[/tex]
Here, v is the speed, [tex]\nu[/tex] is the frequency of the wave and [tex]\lambda[/tex] is the wavelength of the wave.
It is given in the problem that a sound wave has a frequency of 250 Hz and a wavelength of 0.35 m.
Calculate the speed of the sound wave.
[tex]v=\nu \lambda[/tex]
Put [tex]\nu= 250 Hz[/tex] and [tex]\lambda= 0.35 m[/tex].
[tex]v=(250)(0.35)[/tex]
v= 87.5 m/s
Therefore, the speed of the sound wave is 87.5 m/s.
The absolute index of refraction of medium Y is twice as great as the absolute index of refraction of medium X. As a light ray travels from medium X into medium Y, the speed of the light ray is
Answer:
The speed of the light ray is halved
Explanation:
The index of refraction of a medium is the ratio between the speed of light in a vacuum (c) and the speed of light in the medium (v):
[tex]n=\frac{c}{v}[/tex]
For medium X, we have
[tex]n_x=\frac{c}{v_x}[/tex] (1)
For medium Y, we have
[tex]n_y=\frac{c}{v_y}[/tex] (2)
Dividing (1) by (2), we find
[tex]\frac{n_x}{n_y}=\frac{v_y}{v_x}[/tex] (3)
In this problem, the index of refraction of medium Y is twice as great as the index of refraction of medium X:
[tex]n_y = 2 n_x[/tex]
Substituting this into eq.(3), we get
[tex]\frac{n_x}{2n_x}=\frac{v_y}{v_x}\\v_y = \frac{v_x}{2}[/tex]
So, as a light ray travels from medium X into medium Y, the speed of the light ray is halved.
From the calculation, the speed of the light ray is halved.
What is refractive index?
The term refractive index refers to the ratio of the speed of light in one medium to the speed of light in another medium. We are told that the speed of light in medium Y is twice as great as the absolute index of refraction of medium X.
Let;
refractive index of X be nx
refractive index of y be ny
speed of light in x by vx
speed of light in y be vy
nx/ny = vx/vy
But ny = 2nx
nx/2nx = vx/vy
1/2 = vx/vy
vy = vx/2
Hence, we can see that the speed of the light ray is halved.
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Can anyone help??????????????
I think the answer should be the last one. Magnets attract magnets with unlike poles and repel magnets with like poles
DESCRIBE floods and droughts. What are their effects? EXPLAIN how they can be prevented
Answer:
EFFECTS: ( doughts)
There would be less water in the river for you and other people who live along the river to use. If we use too much water during times of normal rainfall, we might not have enough water when a drought happens.EFFECTS:( FLOODS)
The immediate impacts of flooding include loss of human life, damage to property, destruction of crops, loss of livestock, and deterioration of health conditions owing to waterborne diseases. power plants, roads and bridges are damaged and disrupted, some economic activities may come to a standstill, people are forced to leave their homes and normal life is disrupted.How to prevent from flooding is :
Construct buildings above flood levels. Tackle climate changeHow to prevent from droughts :
drought trends that may occur based on statistical and actual weather forecasts.In the U.S., the U.S. Drought Monitor provides a day-by-day visual of the drought conditions around the country.* Hopefully this helps:) Mark me the brainliest:)!!!
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A ray diagram is shown.
What does the letter X represent?
angle of incidence
angle of reflection
normal
medium
Answer:
Angle of incidence
Explanation:
The diagram shows the reflection of a light ray.
When a light ray undergoes reflection:
- The incident ray, the reflected ray and the normal to the surface all lie in the same plane
- The angle of reflection is equal to the angle of incidence
The two angles are defined as follows:
- The angle of incidence is the angle between the incident ray and the normal to the surface (1)
- The angle of reflection is the angle between the reflected ray and the normal to the surface
In the picture, we see that the angle marked with X corresponds to the angle defined in (1), so it is the angle of incidence.
Match each rock with the correct description.
1. cools quickly on the earth's surface
metamorphic rock
2. cools slowly beneath the earth's surface
organic sedimentary rock
3. formed from the remains of living organisms
intrusive igneous rock
4. formed from pieces of other rocks cemented together
extrusive igneous rock
5. formed when dissolved minerals harden
clastic sedimentary rock
6. formed from heat and pressure
chemical sedimentary rock
Answer:
Explanation:
1. cools quickly on the earth's surface
Extrusive igneous rock
2. cools slowly beneath the earth's surface
Intrusive igneous rock
3. formed from the remains of living organisms
Organic sedimentary rocks
4. formed from pieces of other rocks cemented together
Clastic sedimentary rock
5. formed when dissolved minerals harden
Chemical sedimentary rock
6. formed from heat and pressure
Metamorphic rocks
Answer:
1- Extrusive igneous rock
2- Intrusive igneous rock
3- Organic sedimentary rocks
4- Clastic sedimentary rocks
5- Chemical sedimentary rock
6- Metamorphic rock
Explanation:
Extrusive igneous rock- This are the igneous rocks that are formed when magma ejects out to the surface and quickly solidifies. Since they comes out to the surface, so they are considered to be extrusive igneous rocks. This type of rocks are comprised of smaller crystals due to the faster rate of cooling. For example, basalt.
Intrusive igneous rock- This are the type of igneous rocks that are formed due to the crystallization of magma at a certain depth. This rocks are made up of coarser crystals due to the slow rate of cooling. For example, granite.
Organic sedimentary rocks- This are the type of sedimentary rocks that are comprised of fossil or organic compound. These fossils are trapped about millions of years back. This type of rocks containing fossils are important for determining the past environment, climate and food habitat of these fossil organisms. For example Limestone.
Clastic sedimentary rocks- This are the sedimentary rocks that are formed from the compaction and lithification of loose sediments or broken rock materials. For example, sandstone.
Chemical sedimentary rock- This are the type of sedimentary rocks that are formed from the minerals (crystals). This minerals are made up of the elements that undergoes dissolution in water. For example, oolitic limestone.
Metamorphic rock- This are the secondary rock, either derived from the igneous, sedimentary or other metamorphic rock. These rocks are formed due to the extreme pressure, temperature condition. They are also known as the secondary rocks. For example, Quartzite.
A: the period of the wave
B: frequency of the wave
Answer:
Period of the wave: [tex]T = 0.4 \text{ seconds}[/tex]
Frequency of the wave: [tex]f = 2.5 \text{ Hz}[/tex]
Explanation:
Period of the wave:To calculate the period of a wave from a displacement vs time graph we identify the amount of time it takes for one cycle to be completed. According to the graph, 1 cycle is completed in 0.4 seconds, so:
[tex]T = 0.4 \text{ seconds}[/tex]
Frequency of the wave: To find frequency we simply calculate the inverse of the period because we know the relationship [tex]T= \frac{1}{f}[/tex] or [tex]f = \frac{1}{T}[/tex]
[tex]f= \frac{1}{T}= \frac{1}{0.4 s}= 2.5 \text{ Hz}[/tex]
What organs are involved in caring out these functions?
The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones. It is responsible for our thoughts, feelings, memory storage and general perception of the world.
The human heart is a responsible for pumping blood throughout our body.
The job of the kidneys is to remove waste and extra fluid from the blood. The kidneys take urea out of the blood and combine it with water and other substances to make urine.
The liver has many functions, including detoxifying of harmful chemicals, breakdown of drugs, filtering of blood, secretion of bile and production of blood-clotting proteins.
The lungs are responsible for removing oxygen from the air we breathe and transferring it to our blood where it can be sent to our cells. The lungs also remove carbon dioxide, which we exhale.
Skin is important in creating a physical barrier to protect the body from pathogens.
FOOD PIPE, STOMACH.INTESTINES,ETC..
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The speed of a tennis ball that is served is 73.14 m/s. During a serve, the ball typically starts from rest and is in contact with the tennis racquet for 30 milliseconds. Assuming constant acceleration, what is the average force exerted on the tennis ball during the serve, expressed in terms of the ball’s weight w?
450w
150w
250w
350w
Answer: Third option
F = 250w
Explanation:
The impulse can be written as the product of force for the time interval in which it is applied.
[tex]I = F (t_2-t_1)[/tex]
You can also write impulse I as the change of the linear momentum of the ball
[tex]I = mv_2 -mv_1[/tex]
So:
[tex]F (t_2-t_1) = mv_2 -mv_1[/tex]
We want to find the force applied to the ball. We know that
[tex](t_2-t_1) = 30[/tex] milliseconds = 0.03 seconds
The initial velocity [tex]v_1[/tex] is zero.
The final speed [tex]v_2 = 73.14\ m / s[/tex]
So
[tex]F * 0.03 = 73.14m[/tex]
[tex]F * 0.03 = 73.14m\\\\F=\frac{73.14m}{0.03}\\\\F=2438m[/tex]
We must express the result of the force in terms of the weight of the ball.
We divide the expression between the acceleration of gravity
[tex]g = 9.8\ m / s ^ 2[/tex]
[tex]F=\frac{2438m*g}{g},\ \ m*g=w\\\\g=9.8\ m/s^2\\\\F=\frac{2438w}{9.8}\\\\F=249w[/tex]
The answer is the third option
The average force exerted on the tennis ball during the serve in terms of its weight is closest to 250w, calculated using the equations of motion and Newton's second law.
In this case, the initial velocity is 0 m/s, and the final velocity is 73.14 m/s, with the ball in contact with the racquet for 30 milliseconds (0.03 seconds). The ball's weight w is the product of its mass m and the acceleration due to gravity g (w = mg).
First, we calculate the acceleration a using the equation:
a = (v - u) / t
where v is the final velocity, u is the initial velocity, and t is the time. Substituting the known values, we get:
a = (73.14 m/s - 0 m/s) / 0.03 s = 2438 m/s2
Now, to find the force F exerted on the ball, we use Newton's second law F = ma. However, we want F in terms of the ball's weight w. We know w = mg and F = ma, and by substituting for m from w, we get:
F = (w/g)a
Substituting for a and the acceleration due to gravity (approximately 9.81 m/s2), we find:
F = (w/9.81 m/s2)(2438 m/s2) = 248.72w
Therefore, the average force exerted on the ball in terms of its weight is closest to 250w.
Two soccer players kick the same 1-kg ball at the same time in opposite directions. One kicks with a force of 25N the other kicks with a force of 10N . What is the resulting acceleration of the ball in m/s^2
Answer:
15
Explanation:
1. Different constellations are visible at different times of year because of?
A. The relative motion between Earth and the sun.
B. The relative motion between Earth and the moon.
C. The celestial equator.
D. The celestial sphere.
2. A galaxy is composed of stars and?
A. Interstellar medium.
B. Plasmatic medium.
C. Nebular medium.
D. Gaseous medium.
3. Once the Big Bang occurred, everything in the universe started to?
A. Live and thrive.
B. Expand.
C. Attach itself to each other.
D. Gravitate toward the sun
4. Which stars are the most common?
A. Red giants
B. White dwarfs
C. Low-mass main sequence
D. High-mass main sequence
5. Unlike Jovian planets, the terrestrial planets are small, dense, and?
A. Rocky
B. Gaseous
C. Metallic
D. Tilted
6. How does gravitational force of the moon affect earth?
A. The moons gravity is too small to affect earth
B. The moons gravity pulls on earths oceans, causing tides
C. The moons gravity is so large that it causes large tsunami waves.
D. The moons gravity is slowly pulling earth closer to the moon
1. A. The relative motion between Earth and the Sun
The Earth is constantly moving, be it around its own axis, or around the Sun. As it moves around the Sun over the course of one year, the Earth changes its relative position toward the constellations. This results in different positions of the constellations in different periods of the year, when it comes to viewing them from the Earth of course. It looks for the ordinary observer that the constellations are making lot of movement throughout the year and change their positions, and they do move, just not in that manner, but in fact it is the relative motion between the Earth and the Sun that gives that effect on the night sky.
2. A. Interstellar medium
The galaxies are composed of multiple basic things, with the stars and the interstellar medium being the dominant ones. Apart from these two there are also gases and dust. The galaxies are massive, and even the smallest of them are so big that we can not even imagine in our minds as we don't have a scale in our minds for something so large. They have trillions of stars in them, and the majority of the space between the stars is filled with interstellar medium.
3. B. Expand
The Big Bang theory is the most widely accepted theory about the formation of the universe, even though it doesn't really has proper explanations for certain things. This theory suggests that everything managed to get dragged into a single miniature spot and once the gravity became way to big, an explosion occurred. This explosion was so big, and everything moved so quickly, that in literary thousands of parts of a second millions of light years of space were filled in. Everything was practically expanding from the spot of explosion, expanding outwards, giving the basis for the formation of everything we see in the universe. The process of expanding is still continuing, as we can see with the quasars, and it is expected to do so in the future.
4. C. Low-mass main sequence
From what has been observed from the space until now, it seems that the low-mass main sequence stars are the once that dominate the universe by far, at least in numbers. These stars are also called red dwarfs. They are small stars, having reddish color, and their mass is also relatively low compared to the bigger stars. It is estimated that around three quarters of the stars are actually of this type. Unfortunately, because they are small and their low luminosity, individual stars of this type can not be seen from the Earth with naked eye.
5. A. Rocky
The terrestrial planets are planets that are small in size. They are closer to the Sun, thus they are warmer because of it. Unlike their Jovian counterparts, the terrestrial planets tend to be denser, but also what is a striking distinction is that they are rocky. These planets have rocky surfaces, thus their surfaces are solid, covered with numerous types of geologic features, while the Jovian do not have rocky surface, but instead it is gaseous or icy. The fact that these planets are rocky, also gave big advantage to them when it came to providing conditions for life, and the Earth was the lucky one that had all other things in place and boomed with life.
6. B. The Moon's gravity pulls on Earth's oceans, causing tides
The Moon is very close to the Earth, and it is actually a very large moon for the size of the Earth. It has its own gravity of course, and the sheer proximity means that it will influence on something. Since the gravitational pull of the Earth is stronger, the gravitational pull of the Moon can not do something spectacular, but at least it manages to pull the ocean waters. As it pulls the ocean waters, the Moon's gravity actually cause the high tides and low tides.
Final answer:
The different constellations visible during the year result from Earth's motion around the sun. Galaxies contain interstellar medium alongside stars. After the Big Bang, the universe began expanding. Low-mass main sequence stars are the most common. Terrestrial planets are rocky and affected by the moon's gravitational pull, which causes tides.
Explanation:
Different constellations are visible at different times of year because of A. The relative motion between Earth and the sun.
A galaxy is composed of stars and A. Interstellar medium.
Once the Big Bang occurred, everything in the universe started to B. Expand.
The most common stars are C. Low-mass main sequence stars.
Unlike Jovian planets, the terrestrial planets are small, dense, and A. Rocky.
The gravitational force of the moon affects Earth as B. The moon's gravity pulls on Earth's oceans, causing tides.
Alkali metals are extremely reactive because they a. have very small atomic masses. b. are not solids at room temperature.
c.have one valance electron that is easily removed to form a positive ion.
Answer:
a.
Explanation:
Alkali metals, including elements like sodium and potassium, are extremely reactive due to each having a single valence electron in their outermost shells. This electron is easily removed to form a relatively stable, singularly positive ion, thus making them highly reactive.
Explanation:Alkali metals, being part of Group 1 of the periodic table, are known for their high reactivity due to their atomic structure. This family includes elements like sodium and potassium. They all share an atomic feature which is having a single valence electron in the outermost shell (s electron in ans configuration). This specific feature is what makes alkali metals highly reactive.
The single valence electron is loosely held by the atom and can be easily removed. When this happens, the alkali metal atom forms a relative stable and singularly positive ion (cation). The ease of losing this valence electron, paired with the large atomic radii and the lowest first ionization energy in their periods, gives alkali metals their characteristic high reactivity.
A common trait within the group is that the reactivity increases with higher atomic numbers due to the decreasing ionization energy. In contrast to alkali metals, alkaline earth metals of Group 2 have a completed s subshell in outermost shell, making them less reactive, but still amongst the most reactive elements.
Learn more about Alkali Metals here:https://brainly.com/question/5063184
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