PLEAASSEEEE HELLLPPP !

Answer:

3 to 4

Explanation:

By the time they reach 3 they have achieved speaking 200 or even more

Answer:

C

Explanation:

Edge2020

Machine weights are safer when used correctly, but free weights can be dropped and cause injury. These are safety considerations to keep in mind whether using free weights or machine weights. But because they aren't big, complicated machinery, free weights are less expensive.

Resistance machines and free weights are very different from one another in terms of how they work and the results they can create.

Machines are set in place and can only move in a few directions, whereas free weights can be moved in whatever direction the user selects. This is the main distinction between machines and free weights. Free weights require you to utilize more stabilizing muscles to control them, whereas resistance machines help you by stabilizing you while you move.

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Answer:

Av = 25 [m/s]

Explanation:

To solve this problem we must use the definition of speed, which is defined as the relationship between distance over time. for this case we have.

[tex]Av=\frac{distance}{time}[/tex]

where:

Av = speed [km/h] or [m/s]

distance = 180 [km]

time = 2 [hr]

Therefore the speed is equal to:

[tex]Av = \frac{180}{2} \\Av = 90 [km/h][/tex]

Now we must convert from kilometers per hour to meters per second

[tex]90[\frac{km}{h}]*1000[\frac{m}{1km}]*1[\frac{h}{3600s} ]= 25 [m/s][/tex]

Answer:

newtons law of force

newtons law of force explains that something may or can or canot move depending on the objexts mass.

Answer:

C. Inverted

Explanation:

When a negative magnification is obtained, it means that the image is inverted. When an object is placed far away from a converging lens than the focal length, the image is formed on the opposite side of the lens. In this case, a screen is introduced at image position for viewing. The image is focused up-side down. It is real and inverted.

Answer:

My answer was A not sure if its correct as i am still doing the rest of the questions.

Explanation:

The particles will have more space between them and will be moving at higher speeds as steam compare to water.

The quantity of heat (in joules or calories) per mole or unit mass of the substance undergoing a change in state is the typical way to represent latent heat.

The latent heat involved in melting solids or freezing liquids is referred to as the "heat of fusion," while the latent heat involved in vaporizing solids or liquids or condensing vapor is referred to as the "heat of vaporization."

When water boils at 100°C and turns into steam, water vaporizes into steam by absorbing heat of vaporization. This heat energy remains in the steam as kinetic energy and makes their movement fast.

So, The molecules will have more space between them and will be moving at higher speeds as steam compare to water.

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Answer:

All objects emit and absorb infrared radiation. The hotter an object is the more energy it radiates per second. Infrared radiation can travel through a vacuum. When infrared radiation hits an object some of the energy is absorbed, making the objects temperature increase, and some is reflected.

Explanation:

Answer:

As ice melts into water, kinetic energy is being added to the particles. This causes them to be 'excited' and they break the bonds that hold them together as a solid, resulting in a change of state: solid -> liquid.

Explanation:

As the ice melts into liquid water, the kinetic energy of the particles in the sample increase. The temperature of the sample is directly proportional to the kinetic energy of the particle.

The kinetic energy of an object is the energy which it possesses due to the motion of the object. Kinetic energy is defined as the work which is needed to accelerate a body of a given mass from the rest position to its stated velocity. The body of an object maintains the same amount of kinetic energy which it gained during its acceleration unless its speed changes.

The temperature is directly proportional to the kinetic energy of the object. As the temperature of the object increases the phase of the object changes from solid to liquid.

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Answer:

their masses and their distances from Mars

Explanation:

Hope this helped

Also can u pls mark me brainliest

Answer:

Explanation:

Using the efficiency formula;

Efficiency = Work done by the machine (output)/work done on the machine (input) ×100%

Efficiency =w/50 ×100

90 = 100w/50

Cross multiply

90×50 = 100W

4500 = 100W

W = 4500/100

W = 45Joules

Hence the lever does 45Joules of work on its load

2) Mechanical Advantage= Load/Effort

Given

MA = 4

Load = 500N

4 = 500/Effort

Effort = 500/4

Effort =125N

Hence the effort required to lift the load is 125N

1. The work done by the lever on its load is 45 J

2. The force needed to exert to lift the load is 125 N.

1. Determination of the work done by the lever on the load.

Work Input = 50 J

Efficiency = 90%

[tex]efficiency \: = \frac{work \: output}{work \: input} \times 100 \\ \\ 90\% = \frac{work \: output}{50} \\ \\ cross \: multiply \\ \\ work \: output \: = 90\% \: \times 50 \\ \\ work \: output = 0.9 \: \times 50[/tex]

Therefore, the work done by the lever on the load is 45 J

2. Determination of the force needed to lift the load

Mechanical advantage (MA) = 4

Load (L) = 500 N

[tex]mechanical \: advantage \: = \frac{load}{effot} \\ \\ 4 \: = \frac{500}{effort} \\ \\ cross \: multiply \\ \\ 4 \: \times effort \: = 500 \\ \\ divide \: both \: side \: by \: 4 \\ \\ effort \: = \frac{500}{4} \\ [/tex]

Therefore, the force needed to lift the load is 125 N

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Answer:

Treatment options include medications, particularly tricyclic antidepressants and SSRIs,21,22 and psychotherapy. Nonpharmacologic treatment strategies (e.g., massage, acupuncture) may also be beneficial. patients initially presented with symptomatic pain due to a shoulder injury.

Somatoform disorders can be treated by psychotherapy and through medications.

Somatoform disorders are a group of psychiatric disorders whereby patients have a wide variety of clinically significant but unexplained physical symptoms.

The treatment options for somatoform disorders include:

Therefore, somatoform disorders can be treated by psychotherapy and through medications.

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Answer:

constellation is just a name for a set of stars that are perceived, from an earth viewpoint, to make a form in tge night sky…. the Plough, the Great Bear, for example. A galaxy is a formation of stars that are revolving around a centre, our own solar system lies in the outer edge of the galaxy known as the Milky Way.

Explanation:

Answer:

same weight

Explanation:

because same

Answer:

speed are different at different places

Explanation:

because it's top speed is 50km/h,so it's initial speed may be less. when it covers some distance it's speed changes again. then we have given a mean speed .mean speed means sum of all speed divided by sum of total time.so the mean speed and final speed differs from each other

Answer:

run

Explanation:

run - less wet

walking - more wet

Answer: KE= 1/2 m v^2

KE= 1/2 2500 (0)^2

KE= 0

Explanation: since initial velocity is 0, the KE is 0.

The initial kinetic energy, in [J], of car 1 is 0.

KE= 1/2 m v^2

KE= 1/2 2500 (0)^2

KE= 0

Kinetic energy is a form of energy that an object or a particle has by means of reason of its movement. If paintings, which transfer strength, are carried out on an object via making use of an internet pressure, the object hastens and thereby gains kinetic energy.

The kinetic strength of an object depends on its velocity. To trade its pace, one must exert pressure on it. It turns out there's a connection between the pressure one applies to an object and the resulting change in its kinetic electricity: KE(very last) - KE(initial) = (force) (distance)

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Answer:

d = 4.47 [m]

Explanation:

To solve this problem we must make a free body diagram, where we can see the direction of the force acting with the appropriate angles. In the attached image we can see the free body diagram mentioned.

So in the image, we can see an angle of 65° with respect to the horizontal, therefore we can calculate the horizontal component of the force.

Fx = 22.4*cos (65)

Fx = - 9.46 [N] (it's negative because the force is pointing in the negative direction).

We can obtain the same result using 115° as the angle.

Fx = 22.4*cos (115)

Fx = 9.46 [N]

Now we know that work is defined as the product of the force by the distance, therefore we have.

Note: Always the work must be calculated with the force parallel

to the movement

W = F*d

Where:

W = work = 42.3 [J] (units of joules)

F = force parallel to the movement = 9.46 [N]

d = distance [m]

d = W/F

d = 42.3/9.46

d = 4.47 [m]

Answer:

Explanation:

the person on top of me is right it’s 4.47

Answer:

Explanation:

The weight of the crate will e equal to its normal reaction R

Since R = mgsin theta = W

W = mgsintheta ( resolved along the vertical perpendicular to the plank

Fy = 523sin22°

Fy = 195.92N

Since the weight is acting along the negative y direction,

Fy = -195.92N

The force parallel to the plank will be the force acting in the horizontal direction.

Fx = Fcos theta

Fx = 523cos 22°

Fx = 484.9N

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Actually Welcome to the Concept of the Rays of light.

Since we know that, The light ray on a shiny surface makes a angle with the normal, hence The Angle of incidence is equal to angle of reflection made with Normal Axis in the middle.

Thus Option c.) is correct.

C.) is the Answer.

The angle of reflection given the incident ray from the given diagrams is option C.

When a light ray strikes the shining surfaces, the part of the light gets refracted. The bouncing back of the light is called reflection. When the light strikes the surface is called an incident ray.

When the light ray incident on the surface, the light returns back to the same medium is called reflection. The laws of reflection are, the angle of incidence is equal to the angle of reflection, and the incident ray, reflected ray, and normal takes place in the same plane. The speed of light remains the same in the process of reflection.

The reflected light ray changes the path of direction in the same medium. When a light ray enters from one medium to another, the speed of light gets decreases.

Thus, the ideal solution is option C.

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The answer to the question is an orgamisn

Answer:

The thing having life are called living things

Answer:

D carries water from the roots to the leaves.

is the answer.

Explanation:

Xylem is the specialised tissue of vascular plants that transports water and nutrients from the plant–soil interface to stems and leaves, and provides mechanical support and storage.

Answer:

D carries water from the roots to the leaves

Explanation:

have a nice day

Answer:

both

Explanation:

because when it is hot in summer 5hat is the air and the sund u can warm things up and then it get hot

Answer: You can easily find out the beginning point of the line by using dot representation. When it comes to position vector, it expresses the exact position of certain object from the starting point of the coordinate system. The vector is a straight line that has a certain end which is fixed to its body.

brainliest please :)

Answer:

We can easily find out the beginning point of the line by using dot representation. When it comes to the position vector, it expresses the exact position of a certain object from the starting point of the coordinate system. The vector is a straight line that has a certain end that is fixed to its body.

Answer:

18joules

Explanation:

1/2 of 4=2

2 multiply by 9= 18 joules

Answer:

because if the plant that produced that type of energy broke down you would need another type of energy to replace it.

Explanation: