what are winter flowers

Sodium (Na) is a Alkali metal so that's the answer

Answer:And the equation shows that the electrical force depends inversely upon the distance of separation between the two charged objects. So whatever change is made in the separation distance, the opposite or inverse change is made in the strength of the electrical force.

Explanation:

does this help

Answer: 3.5 × 10–1 liters

Explanation: Plato

Kinetic energy is energy that is moving

Kinetic energy is the energy an object has because of its motion. It's different from potential energy which is stored energy based on an object's position. These energies are often interconverted in many systems.

The correct option is A.

The energy an object has due to its motion is termed as kinetic energy. It can be calculated using the equation KE = 0.5mv², where 'm' is the mass of the object and 'v' is its speed. For example, a ball thrown in a field will gain kinetic energy as it moves through the air. This energy is a form of translational motion which stands true for non-rotational motion.

This is different from potential energy, which is stored energy based upon an object's position or state. A good example is a sled poised at the top of a hill, it has gravitational potential energy because of its elevated position. These types of energy are interrelated, as in many systems potential energy is transformed into kinetic energy, and vice versa.

Hence The correct option is A.

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v = d/t

v = 100/2

v=50

50 mph

If You paddle a canoe with a force of 325 N and If you and the canoe have a combined mass of 250 kg then the acceleration of the canoe would be 1.3 m/s²

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 = ma

As given in the problem if you paddle a canoe with a force of 325 N. You and the canoe have a combined mass of 250 kg

F = 325 N

m = 250 Kg

a =?

By substituting the values in the formula

325 =250×a

a = 1.3  m/s²

Thus, If a canoe is paddled with a force of 325 N and has a combined mass of 250 kg, the canoe will accelerate at a rate of 1.3 m/s².

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When a hypothesis is confirmed true by evidence from many experiments, it becomes widely accepted by scientists, and it gets a new name: 'Theory' .

M = mass of the ball A = 5.0 kg

m = mass of the ball B = ?

V = initial velocity of the ball A before collision = 20 m/s

v = initial velocity of the ball B  before collision = 10 m/s

V' = final velocity of the ball A after collision = 10 m/s

v' = final velocity of the ball B after collision = 15 m/s

using conservation of momentum

M V + m v = M V' + m v'

(5.0) (20) + m (10) = (5.0) (10) + m (15)

100 + 10 m= 50 + 15 m

5 m = 50

m= 10 m/s

The mass of unknown ball is of 10 kg.

What is Conservation of Momentum?

The conservation of momentum says that, "When there is a collision between the two objects, then the momentum of each object before the collision is equal to the momentum of objects after the collision.

Given data:

The mass of the first ball is, m = 5.0 kg.

The speed of the first ball is, u = 20 m/s.

The speed of unknown ball is, u' = 10 m/s.

Speed of first ball after collision is, v = 10 m/s (same direction).

Speed of second ball after collision is, v' = 15 m/s (same direction).

Since each ball has the same direction, before and after the collision. So, the expression for the conservation of linear momentum is,

mu + Mu' = mv + Mv'

here,

M is the mass of unknown ball.

Solving as,

(5 × 20) + (M × 10) = (5 × 10) + (M × 15)

100 + 10M = 50 + 15M

50 = 5 M

M = 10 kg

Thus, we can conclude that the mass of unknown ball is of 10 kg.

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I would say C as a primary source is a first person encounter meaning the information given should be in detail.

D is incorrect as we cannot infer a scientist written it

B is incorrect because the level of reading for a person does not depend on what type of source it is from

A would not be correct as a secondary source is a person writing about someone else's work

A combustion engine converts chemical energy (from the gasoline/kerosene/jet fuel) to mechanical/kinetic energy (in the rotating drive-shaft).

A combustion engine converts chemical energy stored in fuel into mechanical energy with an efficiency of typically 25%-30%. Gas-electric hybrid engines aim for higher efficiency, while large electrical generators and mammalian liver cells can demonstrate efficiencies from 30% to approximately 99%.

A combustion engine converts chemical energy to mechanical energy. This transformation occurs when a fuel, such as gasoline, is combusted inside the engine's cylinders. The chemical reaction between the gasoline and oxygen rapidly produces gaseous products that expand and exert a force on the pistons. As the pistons move, they generate mechanical energy, which moves the vehicle. However, the efficiency of this conversion is low, with most internal combustion engines converting only 25%-30% of the fuel's stored energy into work, while the remainder is wasted as heat.

Modern advancements, such as gas-electric hybrid engines, aim to increase fuel efficiency by up to 50% compared to traditional combustion engines. On the other hand, large electrical generators demonstrate high efficiency (approximately 99%) in their energy conversion from mechanical to electrical energy. In terms of everyday appliances, the traditional incandescent light bulb exhibits one of the lowest efficiencies, with only around 5% of the electrical energy turning into light, whereas mammalian liver cells can have an efficiency between 30%-50% when using fuels like glucose.

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Force = mass × acceleration = kg × m/s^2 = Newton

Answer:

Option A is the correct answer.

Explanation:

Force = Mass x acceleration

Unit of force = Unit of mass x Unit of acceleration = kg x m/s²

kg m/s² is also called as Newton (N)

Option A is the correct answer.

Δx = path difference between the waves from two speaker at the listener = difference in distance of speakers from the listener = 45 cm = 0.45 m

n =  1                     (for fundamental frequency )

λ = wavelength

v = speed of sound = 340 m/s

f = frequency of the sound = ?

using the condition for constructive interference

Δx = n λ

0.45 = 1 λ

λ = 0.45 m

frequency of sound is given as

f = v/λ

f = 340/0.45

f = 756 Hz

nearest choice is 764 Hz , hence the correct choice is A. 764 Hz

Okay so the electron configuration is [tex]1s^{2}2s^{2}2p^{5}[/tex]. Look at the periodic table. There are 2 blocks you need to know for this question: the s-block, which is comprised of groups 1 and 2, and the p-block, which is comprised of groups 13 through 18. Because your configuration ends in [tex]p^5[/tex], your element has to be in group 17, a halogen. Now, you need to know another thing - your s sub-level has 1 orbital and your p sub-level has 3 orbitals. Every orbital can fill up with 2 electrons. Now, the fact that the configuration ends in [tex]s^{2}...p^{5}[/tex] tells you that the s-orbital is filled, and your p sub-level is not completely filled. If it was, you would have 8 valence electrons, and it would end in [tex]p^6[/tex]. Now, because it ends in [tex]p^5[/tex], it has one less valence electron, so in your element you have 7 valence electrons.

The electronic configuration of an element is 1s²2s²2p⁵, it will have 7 valence electrons. The correct option is C.

An element's electrical configuration is 1s²2s²2p⁵. We need to take into account the outermost energy level, which is the second energy level (marked by the number "2"), in order to calculate the amount of valence electrons.

There are a total of three sublevels in the second energy level: 2s, 2px, 2py, and 2pz. The maximum number of electrons that can be held by the 2s sublevel is 2, and the same is true for the 2p sublevels (2px, 2py, and 2pz).

As can be seen from the electrical structure, there are 2 electrons in the 2s sublevel (1s²2s²) and 5 electrons in the 2p sublevels (2p⁵). Thus, there are seven valence electrons in all for the element.

Thus, the correct option is C 7.

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Your question seems incomplete, the probable complete question is:

The electronic configuration of an element is 1s22s22p5. How many valence electrons does it have?

A. 4

B. 5

C. 7

D. 9

I took the test and this is the answer key showing I got it right..

Hope this helps!

Answer: The nitrogenous bases are complementary to each other which means the complementary bases will bind with each other. Example: Adenine will bind with Thymine and Guanine will bind to Cytosine.

Explanation:

ACTGGAT→    TGACCTA

GCGTACA→   CGCATGT

CGGTTAA→   GCCAATT

AATGGCC→   TTACCGG

ATTGCGT→   TAACGCA

This is how the nitrogenous bases are paired in DNA(deoxyribonucleic acid) which makes one individual different from other.

Answer:

C

Explanation: got it right on plato

The action does peter take that meet the new boy’s parents and tell them to keep their kid away from his daughter. Thus, option D is correct.

The parents generally ask his daughter to stay away from the new boy and raise an issue with the school administrators over admitting students from another culture as well as encourage his daughter to make friends the new boy and they meet the new boy’s parents and tell them to keep their kid away from his daughter.

They also not bother much with the new boy because he is from a different culture and Peter notices that his eight-year-old daughter frequently mentions the unusual habits of a new boy, who is from a different culture, at her school. Raise an issue with the school administrators over admitting students from another culture.

Therefore, The action does peter take that meet the new boy’s parents and tell them to keep their kid away from his daughter. Thus, option D is correct.

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The question is:

"What is the angle of incidence ?"

Answer: angle of reflection

Explanation: the angle made by a reflected ray with a perpendicular to the reflecting surface.

Answer:

(A) Perform another experiment to test their conclusions

Explanation:

Assuming both scientists are not making logical mistakes in their reasoning, if the data set permits two reasonable but different conclusions, then there is a need to improve such a data set. An improvement could comprise adding new/more samples, increasing accuracy of the measurement, or adding new aspect to the data sampling. This is repeated until there is a reasonable consensus among the scientists.

Kayakers wax their boats to

c) reduce their input force

Wax is applied by the kayakers to reduce the force of friction between the water and surface of boat. reducing the force of friction between the water and surface of boat reduces the amount of force needed to gain a particular amount of acceleration. hence the input force is greatly reduced by waxing the surface of boat.

Answer:

A) 37 m

Explanation:

The car is moving of uniformly accelerated motion, so the distance it covers can be calculated by using the following SUVAT equation:

[tex]v^2 -u^2 = 2ad[/tex] (1)

where

v = 0 m/s is the final velocity of the car

u = 24 m/s is the initial velocity

a is the acceleration

d is the length of the skid

We need to find the acceleration first. We know that the force responsible for the (de)celeration is the force of friction, so:

[tex]F=ma=-\mu mg[/tex]

where

m = 1000 kg is the mass of the car

[tex]\mu = 0.80[/tex] is the coefficient of friction

a is the deceleration of the car

g = 9.8 m/s^2 is the acceleration due to gravity

The negative sign is due to the fact that the force of friction is against the motion of the car, so the sign of the acceleration will be negative because the car is slowing down. From this equation, we find:

[tex]a=-\mu g[/tex]

And we can substitute it into eq.(1) to find d:

[tex]v^2 -u^2 = 2(\-mu g) d\\d= \frac{v^2-u^2}{-2 \mu g}=\frac{0-(24 m/s)^2}{-2(0.80)(9.8 m/s^2)}=36.7 m \sim 37 m[/tex]

The length of skidding marks will be of 37 m. Hence, option (A) is correct.

Given data:

The mass of car is, [tex]m = 1000\;\rm kg[/tex].

The initial speed of car is, u = 24 m/s.

The final speed of car is, v=0.  (Car stops finally due to friction)

The coefficient of friction between the tires road is,  [tex]\mu = 0.80[/tex].

The linear force acting on the car is opposed by the frictional force. Therefore,

Linear force = frictional force

[tex]F = -f\\ma= -\mu mg\\a= -\mu g\\a = -0.8 \times 9.8\\a =-7.84 \;\rm m/s^{2}[/tex]

Now, apply the third kinematic equation of motion as,

[tex]v^{2}=u^{2}+2as\\0=24^{2}+2(-7.84)s\\s \approx 37 \;\rm m[/tex]

Thus, the length of skidding marks will be of 37 m. Hence, option (A) is correct.

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Answer:

The reactance of the capacitor

Explanation:

In an AC circuit containing different elements (capacitors, resistors and inductors), we cannot simply calculate the equivalent resistance of the circuit, so another quantity is used, which is called reactance.

For a capacitor, the reactance is given by:

[tex]X=\frac{1}{2 \pi f C}[/tex]

where:

f is the frequency of the AC current in the circuit

C is the capacitance of the capacitor

The reactance has a similar meaning to that of the resistance for a DC current. In fact, we notice that:

- When f=0 (which means we are in regime of DC current, because the current never changes direction), the reactance is infinite. This is correct: in a DC circuit, the capacitor does not let current pass through it, so it like it has infinite resistance (=infinite reactance)

- When f tends to infinite, the reactance becomes zero: in such situation, the current in the circuit changes direction so quickly that the capacitor has no enough time to "block" the current in the circuit, so it like it has almost zero resistance (zero reactance).

Answer:

Explanation:

Capacitive reactance is  the opposition offered to the passage of alternating current.

The capacitive reactance is defined as

[tex]X_{C}=\frac{10^{6} }{2 \pi f C}[/tex]

Where [tex]X_{C}[/tex] is the capacitive reactance in ohms, [tex]f[/tex] is the AC frequency in hertz and [tex]C[/tex] is the capacitance in microfarads.

This mathematical definition stablish a relation between capactivie reactance and frequency, actually these two are inversely proportional, that is, more frequency means less capacitive reactance.

Therefore, the word that completes the statement is reactance.

It is very difficult for an atom to accept a proton. It can only be done under very special circumstances. So A and C are both incorrect. I don't see how D is possible. The atom does lose 1 electron, but how it gets 21 is think air.

The answer is B which is exactly what happens.

Answer:

B. The atom loses 1 electron, to make a total of 18.

Explanation:

Since proton lies inside the nucleus of the atom so it is bounded strongly by the nuclear forces

So it is very difficult to charge an atom by transfer of protons as it need to work against nuclear forces

But electrons orbit around the nucleus in different energy state so all those electrons which are lying at the outermost orbit is loosely bound and hence it is easy to remove that electron.

Since potassium ion has atomic number 19

so for a neutral ion it has 19 electrons and 19 protons in it

now in order to make it a charge of +1

so we can remove one electron from it so that it has 19 protons and 18 electrons it so due to which it will have +1 charge on it

so correct answer will be

B. The atom loses 1 electron, to make a total of 18.

Answer

Another wave

Explanation

Diffraction is the is the change of direction of a wave due to an obstacle or an opening in the media. It results in to a disturbance.

It occurs when a wave goes through a gap or meets a barrier in a media such as a small island, a large ship or a protruding rock.

The correct answer is another ship.

B. another wave

is the correct choice

Mass = density * volume

m = ???

d =3.2 grams / cm^3

V = 5.5 cm^3

Mass = 3.2 grams/cm^3 * 5.5 cm^3

Mass = 17.6 grams

Answer: a. Identify and describe TWO environmental problems associated with fracking.

The two environmental problems associated with fracking are:

1. The natural gas liberated after fracking contaminates the ground water and the atmosphere. Hence, causes water and air pollution.

2.The chemicals used along with application of pressure to cause fracking will contaminate ground water.

b. Describe one economic benefit to society of using fracking to obtain natural gas from shale.

The fracking process is beneficial as it provided with natural gas from a shale. Natural gas is required to generate electrical energy and to meet transportation and household needs.

c. Describe which earthly sphere (or spheres) are impacted by fracking.

Geosphere and hydrosphere are the earth spheres which are impacted by fracking.

Earth revolves around the sun, (and rotates on its axis).

The first and third choices on the list will attract, because UNlike poles are facing across the gap.

Choice #1: . . . [S]-----[N] . . . [S]-----[N]

Choice #3: . . . [N]-----[S] . . . [N]-----[S]

the first and the third chooses are the answer