Please help me with this I’m stuck!

We know that in a change of state heat is used to break the links between the molecules or atoms of the substance but the temperature remains the same; in the graph shown we notice that we have two portions where the temperature remains constant 20° and 120°. Since vaporizing happens at greater temperature that solid to liquid change of state we conclude that the region where this happens is 120°; therefore, the answer is A.

Answer: b and c

Explanation: most scientific naswer

Magnetic fields and electric circuits are connected via inductance. When a sine wave's peak and zero axis crossing occur at the same time, it is said to be in-phase.

For the inductance calculation, use the formula L = V*Ton/Ipk. All of the numbers needed should be right there on the oscilloscope.

Inductance is a property of an electric circuit by which a changing magnetic field creates an electromotive force, or voltage, in that circuit or in a nearby circuit.

An Inductor is equivalent to a short circuit to direct current, because once the storage phase has finished.

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Answer:

3,033,276 J

Explanation:

The work can be calculated as

W = Fd

Where F is the force and d is the distance.

Replacing F by 29,738 N and d by 102 m, we get:

W = (29,738 N)(102 m)

W = 3,033,276 J

Then, it has done 3,033,276 J

Two possible source of error in measuring speed is when there is error in measuring time or the distance.

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

To measure speed of the body is we have to measure distance and time so when there is error in measurement of the distance and time.

Two possible source of error in measuring speed is when there is error in measuring time or the distance.

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The value of the spring constant of this spring will be 50,000 N/m, which has a equilibrium length of 0.100m applied by 40N force.

Formula for the spring force is given as-

F = (1/2) kx²

where, F = force, k= spring constant and x = change in length of the spring.

Change in length of the spring = Changed length - equilibrium length

Change in length of the spring(x) = 0.140m - 0.100m = 0.040m

Putting the values as F = 40.0 N, x = 0.040m, k =?

F = (1/2) kx²

40 = (1/2) × k × (0.040)²

k = 80/0.0016

k = 50,000 N/m

Hence, the value of the spring constant of this spring will be 50,000 N/m.

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2)

Explanation

the electrostatic force between two forces is given by:

then, complete the table we need to use this equation

where

k, q1 and q2 are ginven in the table, so

Step 1

Let

so,replace

hence, for tha row

Step 2

now, do the same for the next Fe, so

b)Let

so,replace

hence, for tha row

Step 3

now, do the same for the next Fe, so

c)Let

so,replace

hence, for that row

Step 4

now, do the same for the next Fe, so

c)Let

so,replace

hence, for tha row

Step 5

now, do the same for the next Fe, so

c)Let

so,replace

hence, for that row

Step 6

find the electrostastic force betweeen electrons

let

as the distance is not give, let's use

distance =1

replace in the formula

therefore, the electrostaic force is

I hope this helps you

When two objects of identical mass begin from rest at the same height at the top of two different hills - hill a and hill b, then both of the balls will have the same speed at the bottom of the incline. It is because, earth provides same amount of gravity to both of the balls. Therefore both will have same speed.

In Physics, the relation between gravity and mass is described as that both mass and gravity are directly proportional to each other.

In other words, if an object has less mass it will experience lesser amount of gravity and vice versa.

In our case, we are provided with two balls having same mass, as both have same mass so both will experience same amount of gravity which means the gravity will have zero effect on the speed with which they move.

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The satement is true.

This comes from the fact that, according to Einstein:

and since c² is a very large number then, if we find a way to convert all the mass in energy a small amount will produce a large amount of energy.

The distance is 12m

The direction of movement of the body or object is defined by velocity. Speed is fundamentally a scalar quantity. Velocity is, in essence, a vector quantity. It is the rate at which distance changes. It is the displacement rate of change.

Given a river is flowing north at 2 m/s and you swim straight across east at 1.5 m/s,

We have to determine how far up shore will be from your starting point once you reach the other side when the river is 9 m wide

First, solve for the time it takes you to reach the other side. Let's let north be the y-direction and the direction across the river be the x-direction.

∆X =Vxt

9m = 1.5m/s  x t

T = 9/1.5

T= 6sconds

Now use the time you are in the water to find

∆Y= Vyt

∆Y= 2m/s x 6s

= 12m

Therefore the distance is 12m

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ANSWER:

STEP-BY-STEP EXPLANATION:

Using the concept of thermodynamics, we got heat as an output when we stir the liquid occasionally.

Actually, according to the Clausius statement of the second law of Thermodynamics: Heat can transfer from a hot body to a cold body, but it cannot transfer from a cold body to a hot body unless any external work has been done on the system.

Thus when you stir a hot liquid, due to the phenomenon of the convection (It is a heat transfer process that can occur only in fluids), part of the heat from the hot liquid goes to the medium which you are stirring (Eg. spoon) and another part of heat flows to the surrounding which is at a room temperature. Thus due to these things heat energy is liberated at a higher rate

But when you went on to stir a cold liquid (let’s say it is at 19 °C), you are giving mechanical work on the system. As mentioned in the second law of Thermodynamics the heat gets transferred from cold liquid to the surrounding air (let's say 30 °C ) due to the work given (stir). But the transfer of heat is very small which could make the liquid warm only to a little amount due to which the temperature of the liquid increases (let’s say it is at 25 °C), and convection (heat transfer process in fluids. In here it is from a cold liquid to at air) also occurs a little amount. So to make this hot even more work has to be done on the system (cold liquid) if the system is closed the work to be done can also be reduced.

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135 miles represents the distance the faster car traveled.

Distance is an object's overall movement, regardless of direction. Regardless of an object's starting or ending point, distance can be defined as the amount of ground it has travelled.

If we call the slower vehicle's speed S, the other vehicle's speed is S + 10 mph.

They've been on the road for three hours as of 5:00 p.m. The faster car travels 3(S+10) miles, while the slower one travels 3S miles.

However, the sum of the two distances has to be 240 miles, so 3S+3(S+10)=240,

3S+3S+30=240,

6S=210, and

S=35 mph.

The faster vehicle travels at 45 mph. We can see that 3S is equal to 3x, which means that x=S=35 mph and that the faster vehicle travels 3×45=135 miles.

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looking at the graph,

1) Displacement includes direction

Displacement from 8s to 16s = 15 - 6 = 9

Displacement fbetween 16s and 24s = 0 - 15 = - 15

Displacemet between 8s and 24s = 9 - 15

Displacemet between 8s and 24s = - 6m

2)

Distance does not include direction

from 8s to 16s,

distance travelled = 15 - 6 = 9 m

From 16s to 24s,

distance travelled = 15 - 0 = 15

Total distance between 8s and 24s = 9 + 15

Total distance between 8s and 24s = 24 m

The result would have been different with the temperature being constant if the energy transferred between the hot objects and cold water were 100%.

This is referred to as the degree of hotness or coldness of a substance or body and is influenced by thermal energy and the unit is Kelvin.

The process of heat transfer which is known as conduction is used in this process and some are lost to the environment or surroundings but in a situation where the energy transferred between the hot objects and cold water were 100% then there will be a constant temperature.

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Given:

• Acceleration of rocket = 28.0 m/s²

• Mass of astronaut = 95 kg

Let's find the apparent weight of the astranaut.

In a direct rocket motion, as we are coming towards the Earth the weight reduces while as the rocket is going up, you feel more weighted.

Now, to find the apparent weight of the astranaut, apply the formula:

Where:

Aw is the apparent weight

m is the mass = 95 kg

g is acceleration due to gravity = 9.8 m/s²

a is the acceleration of the rocket = 28.0 m/s²

Thus, we have:

Therefore, the apparent weight of the astranaut is 3.591 kN

ANSWER:

3.591 kN

Answer:

1200 N

Explanation:

First, we need to calculate how much time the force was applied. If the stone traveled at 20.0m/s and made a 0.20 cm deep dent, the time is equal to

Where the distance is 0.20 cm = 0.0020 m and the average speed can be calculated as:

Therefore, the time is equal to

Then, the force can be calculated using the following equation for impulse

Where m is the mass, v is the speed and t is the time, so replacing m = 0.012 kg, v = 20 m/s and t = 0.0001 s, we get

So, the average force was 1200 N

During autumn, the storm travels at a speed of 20 m/s, then the average force the car has to exert to stop the damaging hail storm is 1200 N.

A force in physics is an effect that has the ability to modify an object's motion. A bulk object's velocity can vary, or accelerate, as a result of a force. Intuitively, a push or a pull can be used to describe force. Being a vector quantity, a force also has magnitude and direction. The SI unit of newton is used to measure it (N). The letter F symbolizes for force.

As per Newton's second law's original formulation, an object's net force is equal to the speed at which momentum is changing over time.

According to the given information in the question,

Speed, s= 20 m/s

Average speed, s = Distance/Time

s = [v(i) + v(f)] / 2

s = (20 + 0)/2

s = 10 m/s

Now calculate the time,

Time, t = 0.0020/10

t = 0.0002 seconds.

Use the equation for impulse,

f × t = mv

⇒f = mv/t

f= (0.012 × 20)/0.0002

f = 1200 N

Therefore, the force applied is 1200 N.

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The density (in kg/m³) of a woman who floats in freshwater with 4.35% of her volume above the surface is 960 kg / m³

If the density of a woman who floats in freshwater with 4.35% of her volume above the surface, the density of the woman is 4.35 % less than the density of fresh water. Let ρw be the density of the woman and ρf be the density of fresh water.

In equation it can be written as

ρw = ρf - 0.04 ρf

ρf = 1000 kg / m³

ρw = 0.96 ρf

ρw = 0.96 * 1000

ρw = 960 kg / m³

Therefore, the density of the woman is 960 kg / m³

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The testicles are the female gonads, whereas the ovaries are the male gonads. The production of gametes is one of the special traits and functions of gonads.

The gonads in males are the testes, whereas those in females are the ovaries. They both work to produce sex hormones and gametes (eggs and sperm). The ovaries are responsible for producing progesterone and estrogen as well as eggs. Sperm and the hormone testosterone are produced by the testes.

By secreting steroid hormones and creating gametes, adult testes and ovaries both perform crucial functions in the reproductive system (Hossain et al., 2012). The healthy growth of both the gonadal somatic cells and germ cells is necessary for gonadal functional maintenance and gametogenesis.

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The maximum induced emf on the circular loop is = Bπr²ω.

When no current is flowing, electromotive force (EMF) equals the terminal potential difference.

Despite the fact that both EMF and terminal potential difference (V) are expressed in volts, they are not the same thing. EMF is the quantity of energy (E) that the battery supplies to each coulomb of charge (Q) that passes through.

Let, the radius of the circular loop is = r.

Angular frequency of rotation is = ω.

And, magnitude of uniform magnetic field = B.

Then, magnetic flux; Φ = B·A = Bπr² cosωt

So, induced emf : ε =  dΦ/dt = Bπr²ω sinωt

Hence, the maximum induced emf is = Bπr²ω.

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Given:

To find:

Fill in the blanks

Explanation:

1) Energy can undergo conversion, changing from one form to another. For example, a wind turbine converts the mechanical energy of the wind into electric energy in the power grid. This power grid can then be converted into thermal energy by an electric heater.

2) Solar panels generate electrical energy by taking radiant energy from the sun and having it undergo conversion. This process does obey the law of conservation of energy because energy isn't randomly created, but it is simply converted.

The magnetic flux through the coil if the component of the field perpendicular to the plane is 0.12t, and the component parallel to the plane is 0.05t is 0.0048 Wb

Φ = B A cos θ

Φ = Magnetic flux

B = Magnetic field

θ = Angle between magnetic field and normal of the surface

A = 0.04 m²

For the component of the field perpendicular to the plane,

B = 0.12 T

θ = 0

Φ = 0.12 * 0.04 * cos 0

Φ = 0.0048 Wb

For the component parallel to the plane,

B = 0.05 T

θ = 90°

Φ = 0.05 * 0.04 * cos 90

Φ  = 0

So, to calculate magnetic flux through this coil, the component of the field perpendicular to the plane needs to be used.

Therefore, the magnetic flux through this coil is 0.0048 Wb

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The energy of the metal d orbitals increases due to an increase in electrostatic repulsion.

Silica nanoparticles that are hydrophilic by themselves are not surface active. However, they establish a potent electrostatic contact with ionic surfactants, which influences the surface behavior of those substances. We describe the interactions between n-heptane and anionic surfactant solutions when hydrophilic silica nanoparticles are present. The utilized particles' sizes are 9 and 30 nm, and the surfactants are sodium dodecyl sulfate (SDS) and dodecyl benzene sulfonic acid (DBSA).

We demonstrate via experimental tensiometry that, in the presence of surfactants, nanoparticles maintain their non-surface-active nature, and that the surface activity of the surfactant directly rises with the concentration of nanoparticles. This phenomenon was explained by the electrostatic repelling contact between the molecules of anionic surfactant and the negatively charged nanoparticles.

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4.4 kg is  the mass, M of the planet​.

m=200 kg

M=?

F= 1200 N.

r= 700m

G=6.674×10^−11

F=GMm/r²

M=Fr²/Gm

M=5.8×10^8/1.310^−8

M=4.4 kg

Mass is used in physics to express inertia, a fundamental characteristic of all matter. Essentially, it is a mass of matter's resistance to changing its direction or speed in response to the application of a force. The change that an applied force produces is smaller the more mass a body has. The kilogram, the unit of mass in the International System of Units, corresponds to 6.62607015 1034 joule seconds using Planck's constant (SI). One joule is produced by multiplying one kilogram by one square meter per second. The kilogram is determined by exact measurements of Planck's constant since the second and the meter have previously been defined in terms of other physical constants.

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Explanation:

Thermocouples are used in applications that range from home appliances to industrial processes, to electric power generation, to furnace monitoring and control, to food and beverage processing, to automotive sensors, to aircraft engines, to rockets, satellites and spacecraft.

Answer:

it is true

Explanation:

Answer:

True, changes of heat can be Endothermic or Exothermic only.

Explanation:

Answer: energy level 2

Explanation:

i did this before

Answer: Magnesim’s electrons are in 3 energy levels .

Explanation: since magnesium has 12 electrons and first shell can only accommodate up to 2 electrons , as shown in picture too, magnesium will have 2 electrons in this first shell or energy level.

Now about rest 10 electrons, 8 will be in 2nd energy level and remaining 2 will be valance electrons and will occupy 3rd shell.

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The trailer hand valve works the trailer brakes. The trailer hand valve must be used handiest to check the trailer brakes. Do now no longer use it in riding due to the hazard of creating the trailer skid.

Pop-off valve - A time period on occasion used to explain the protection valve. Primary reservoir - A tank that generally components air to the brakes at the rear axle(s).

The reason of the hand valves is to permit greater or much less inlet steam nozzles for use at some point of operation. Optimizing the steam nozzles used keeps turbine performance at some point of load changes.

A Safety Relief Valve is designed to open and relieve extra stress from vessels or equipment …after which to re-near and save you the similarly launch of fluid, gas, or steam as soon as everyday situations had been restored. There are some of motives why the stress in a vessel or device can exceed a predetermined limit.

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That is acceleration due to the horizontal component of velocity is 0

When the body is on the projectile we tend to take components on the initial velocity for ease of calculation. The velocity is then divided into its components u sinФ and u cosФ where the horizontal component of the velocity of the projectile is shown by u cosФ while the vertical component of the velocity of the projectile is shown by u sinФ

To calculate the acceleration of either component of the velocity is very easy. In this case, we use the third equation of Newton's Equation of motion.

[tex]V^{2}[/tex]-[tex]U^{2}[/tex]=2as

When we calculate the acceleration of the horizontal component of velocity, we find that since the velocity remains the same at both the endpoint and the start no acceleration takes place.

[tex]U^{2}[/tex][tex]Sin^{2}[/tex]Ф-[tex]U^{2}[/tex][tex]Sin^{2}[/tex]Ф=2as

Thus, 2as=0

That is acceleration due to the horizontal component of velocity being 0

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