If one examines the stars on a really dark night away from the glare of city lights, some stars appear distinctly reddish in color and other appear brilliant blue. why does this happen?

Answer:

A scalar quantity is a quantity that has magnitude but does NOT have direction. An example is speed.

While a vector quantity is a quantity that has BOTH magnitude and direction. For example, force.

True - Because a sound wave carries energy; to propagate energy, energy must be applied for the sound wave to carry energy.

Option D is correct. P wave can travel through liquids. P stand for the primary of pressure wave.

A wave is a phenomenon that flows across a material medium without leaving any lasting mark. Mechanical or electromagnetic waves can be used to classify it. Transverse and longitudinal are the two main forms.

P waves are sometimes known as primary waves or pressure waves. The earliest waves of an earthquake are known as P waves.

P waves may pass through any medium, including liquids, gases, and solids. P waves can't move particles up and down or side to side.

P wave can travel through liquids. P stand for the primary of pressure wave.

Hence, option D is correct

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Answer:

currrent will be halved

Explanation:

v = ir

v/r = i      multiply both sides by  1/ 2

v / (2r) = 1/2 i  

All of the following use subjective scoring EXCEPT Archery.

Subjective scoring is an important and powerful tool you can use to add assessment items that are not easily scored.

Archery is scored based on point values that is assigned to the rings made on the target. Others are not point scoring sports.

Thus, all of the following use subjective scoring EXCEPT Archery.

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Answer:

so therefore, the comb gains electron and the hair losses electrons

Explanation:

It is known that electron contain a negative charge.

So, when an atom gain electrons then number of electrons within the atom increases. As a result, the atom acquires a negative charge.

But when an atom loses electrons, there will be deficiency of electrons within the atom. As a result, the atom becomes positively charged.

Hence,, when people use plastic combs on their hair, the combs become negatively charged. The situation which is true about this is the comb gains electrons and the hair loses electrons.

Answer:

because the book's is covered by papers

Answer:

Okay

It is electric charge

Resistance in the wire increases when the temperature of the wire is increases.

Heating the metal conductor causes atoms to vibrate more that makes more difficult for the electrons to flow through the conductor and thus increasing resistance.

So we can conclude that resistance in the wire increases when the temperature of the wire is increases.

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Answer:

Displacement will be 5m west

Distance would be 21m No direction

Answer:

See below

Explanation:

At point A    the PE = mgh = 2 * 10 * 1 = 20 J

  at point B, all of the PE , 20 J , is converted to Kinetic Energy

KE = 1/2 m v^2

20 = 1/2 (2)(v^2 )

20 = v^2     v = sqrt 20 = 4.47 m/s

for the friction part

 vf = vo t  + 1/2 a t^2      vf = final velocity = 0 (stopped)

                                       vo = original velocity = 4.47 m/s  

                                         a = -1 m/s^2

  0 = 4.47 t + 1/2 (-1) t^2

            - .5t^2  + 4.47 t = 0

                 t ( -.5t+ 4.47) = 0    shows t =  4.47/.5 = 8.9 seconds

Answer:

Explanation:

s = ut+ 0.5at²

u = 0

t = 6

a = 9.81

s = 0 + 0.5 * 9.81 * 36 = 176.58 m

v = u + at

v = 9.81* 36 = 353 m/s

Answer:

educated guesses about the outcome of an experiment

Answer:

Incorrect

Explanation:

the Proton and electron do not enter the same magnetic field

the Electron is opposite of the Proton.

So if u have a magnet with a side with Proton and a side with electron they would attract

if they are two of the same, they will separate

ur welcome:)

correct me if i’m wrong

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red having the frequency of 4.62 and at its limit 4.29 has the lowest frequency. It is the lowest before orange which has 5.00.

Answer:

The wire must be part of a closed circuit.

Explanation:

A closed circuit in electric is what we called a wire that has a complete electrical connection in which electricity flows, where electric current flow from one end to another, in order for magnetism to induce an electric current the circuit has to be closed, or no current will flow.

Answer:

C) Momentum

Explanation:

Refers to an objects mass in motion.

Answer:

Both potential energy and kinetic energy are involved.

Explanation:

As the car is rolling, its potential energy decreases and its kinetic energy increases.

Answer:

q = 1

Explanation:

 q-3/10-(7/10)=0    

        3         7

(q -  ——) -  ——  = 0

       10     10

Answer: ??? D? dont quote me on it tho <3

Explanation:

Answer:

B

Explanation:

Lines with arrows that point outward radiate from the charge in all directions.

step-1.For a positive point charge the lines will radiate out ward equally in all directions.

step-2.For a negative point charge the lines will point inward equally in all directions.

i hop this help :)

Answer:

equal

Explanation:

If all three corresponding sides are equal and all three corresponding angles are identical in measure, two triangles are said to be congruent. These triangles can be slides, rotated, flipped and turned to be looked identical. If repositioned, they coincide with each other. The symbol of congruence is' ≅'.

Congruent means equal, as it is a term used to describe two or more objects or figures that have the same shape and size.

When two or more figures or things have the same size and shape, they are said to be congruent.

When we state that two things or figures are congruent, we mean that their lengths, angles, and proportions are all the same.

The idea of congruence is that there should be no distinction or contrast between the things being compared. It denotes complete equality and a perfect match.

Congruence informs us that all geometric shapes, including line segments, angles, triangles, and others, are the same and can be placed on one another without overlap or gaps.

Thus, a fundamental idea in geometry called congruence enables us to evaluate and contrast geometric forms and their characteristics.

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Calculate the area under the line (integrate)

Quite easily you would know that Work done is force times displacement. So by finding the area under the line he could easily tell the work done

Jordan is using a graph to solve this problem, and the last step in the process would be to calculate the area under the line.  The answer is option D.

In the context of graphs, the area under the line refers to the area enclosed between a line on a graph and one of the axes. The area can be calculated by finding the product of the base of the shape formed by the line and the axis, and the height of the shape, which is the vertical distance between the line and the axis.

For example, in a force-displacement graph, the area under the line represents the work done by the force on an object as it is displaced. By finding the area under the line on this graph, you can calculate the amount of work done on the object by the force.

Here's a brief explanation of the steps involved in solving this problem using a graph:

Step 1: Draw the axes for a force vs. displacement graph.

The x-axis represents displacement and the y-axis represents force. Mark the point where the weight is released (displacement = 0, force = 0) and the point where it falls 45 meters (displacement = 45, force = 1,200 * g, where g is the acceleration due to gravity).

Step 2: Draw the line on the graph.

Draw a straight line connecting the two points on the graph.

Step 3: Calculate the gravitational force.

Calculate the force due to gravity acting on the weight by multiplying its mass (1,200 kg) by the acceleration due to gravity (9.81 m/s^2):

F = m * g

F = 1,200 kg * 9.81 m/s^2

F = 11,772 N

Step 4: Calculate the area under the line.

The area under the line represents the work done on the weight by gravity. To calculate this area, we need to find the area of the triangle formed by the line and the x-axis:

Area = (base * height) / 2

Area = (45 m * (1,200 * g) N) / 2

Area = 26,460 J

Therefore, the work done on the weight by gravity when it falls 45 meters is 26,460 J. The correct option is D i.e Calculate the area under the line.

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It is advisable that Jeff should begin to save about 5% of his income to serve as his retirement plan.

Retirement refers to such a time when one is no longer involved in actual work. It is important that a person ought to save up some money for use via a retirement plan.

It is advisable that Jeff should begin to save about 5% of his income to serve as his retirement plan since he still has many years of work ahead of him.

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Answer:

When a nucleus emits an alpha particle, the mass number of the nucleus A. decreases!!!

Explanation:

An atom releases a Alpha particle, its atomic number decreases by two and its mass number decreases by 4.

Mass is not necessary the main thing we need is Displacement

As

Or

The amount of work done is calculated as the force exerted to remove a object to D distance .