what is meant by the statement" the melting poin of glycerine is 13 degree celsius​

b- a bicycle sitting on the ground

a- a car moving at a constant velocity  

An object is in equilibrium when the forces acting on the object are opposite of one another and equal. In this case, the force of the ground and the force of gravity are both acting on the object, but since the object either isn't moving or has constant velocity, the forces are therefore equal and in opposite directions.

A bicycle sitting on the ground is the statement that suits best to describe the objects in the equilibrium.

Answer: Option B

Explanation:

Equilibrium refers to the static state when there is no movement or displacement. In other words it also means that the forces acting on the object are equal and opposite in direction and the net force will be zero as they are in opposite direction and hence the object doesn't move and remains in the static position. The options A,C,D are related to movement of the object.

Answer:

[(a=58)(b=16)] is the homogeneous mixture

The speed of a car is 58 km/h and 16.11 m/s.

                Speed S = D / T

                        ∴  S = 348/6

                        ∴  S = 58 km/h

                       So , speed S =( 348 x 5 ) / ( 6 x 18 )

                                      ∴  S = 16.11 m/s.

Thus, The speed of a car is 58 km/h and 16.11 m/s.

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Answer:

C. Theories

Explanation:

Theories basically explain why of research findings. By definition, theories help us understand, explain, and predict the occurrence of a phenomena. In research, theories support research findings by explaining how the variables involved influence each other not merely based on observation during this one experiment. It also helps validate the findings by relating it to theories of previous work.

We know that pressure is equal to the relation between force applied perpendicular to a certain area.

[tex]p=\dfrac{F}{A}[/tex]

If we express area we get:

[tex]A=\dfrac{F}{p}[/tex]

The pressure is decrease proportional to the area.

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r3t40

Explanation:

In general, sound (mechanical waves) travels faster in solids than in liquids, and faster in liquids than in gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).

In other words: The speed of sound varies depending on the medium through which the sound waves travel.

So, if we are told the sound wave initially had a speed of 4,000 m/s and it suddenly decreases to 1,500 m/s, this means the sound waves passed from a solid medium to a liquid medium.

Hence, the correct option is: an underground lake.

Answer:

b

Explanation:

Answer:

It is a subjective experience, based on the amplitude of light waves the eye receives.

Explanation:

I would think so it might be this..

Answer:

Radio waves heading upward from Earth often bounce off the thermosphere-D.

With height in the thermosphere, temperature increases quickly. This layer includes the ionosphere. This layer aids in radio transmission and is really responsible for the earth's own reflection of radio waves. Thus, option D is correct.

A large percentage of the free electrons in the ionosphere affect radio propagation. High-frequency (HF) radio waves induce oscillations in the free electrons of the ionosphere, which result in energy radiation back down at the same frequency. The radio wave is essentially returned to Earth in this way.

Some of the radio waves that travel from space to Earth's atmosphere are absorbed by the electrons in the ionosphere, but other waves pass through and can be seen by observers on the ground.

Therefore, radio waves heading upward from Earth often bounce off the thermosphere.

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Answer:

Einstein extended the rules of Newton for high speeds. For applications of mechanics at low speeds, Newtonian ideas are almost equal to reality. That is the reason we use Newtonian mechanics in practice at low speeds.

Explanation:

But on a conceptual level, Einstein did prove Newtonian ideas quite wrong in some cases, e.g. the relativity of simultaneity. But again, in calculations, Newtonian ideas give pretty close to correct answer in low-speed regimes. So, the numerical validity of Newtonian laws in those regimes is something that no one can ever prove completely wrong - because they have been proven correct experimentally to a good approximation.

General Relativity can explain how objects curve space-time.

Newton Mechanics is a particular case of relativity.

The theory of general relativity of Einstein basically related the space-time and the mass of an object. This equivalence is represented in the field equation.

So we can say now that the mass of an object, our sun, for example, can curve the space-time around it. Newton talks about a gravity force but gravity is just the deformation of space-time.

Now, the newton mechanics work perfectly in the system when the speed is less than the speed of light and when masses are apreciables, but general relativity is a general theory that explains how massive objects interact with each other.

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Answer:

The answer is true.

Answer:

Explanation:

It is true that discoveries we always make is based on current knowledge and technology.

These scientific model comes out on the basis of what technology we have in present but it true that their effectiveness gets limited with new discoveries.

For example, the raisin pudding model of atom was a discovery new to that time but with the discovery of new technology that model was not feasible.

The bohr model sets new parameter and adds new information in field of atomic structure.

Answer: Doppler effect

Explanation:

The Doppler effect refers to the change in a wave perceived frequency when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other.  

In other words, it is the variation of the frequency of a wave due to the relative movement of the source of the wave with respect to its receiver.  

Another important aspect is that the effect occurs in all waves (including light and sound). However, it is more noticeable to humans with sound waves.

The Doppler effect is the apparent change in frequency of waves due to the motion of a source.

Answer:

The answer is: John Dalton

John Dalton considered the father of atomic theory

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Explanation:

The spacecraft's weight would be the greatest on Earth, where the strength of gravity is the highest.

The weight of an object is the force of gravity acting on it. Because Mars has less gravity than Earth, an object's weight on Mars would be less than its weight on Earth. As a result, the spacecraft's weight would be greatest on Earth, where gravity is strongest.

An item carried to Mars would weigh around 38% of its weight on Earth, according to. As a result, if the spacecraft weighs 1000 kg on Earth, it will only weigh 380 kg on Mars.

Thus, the weight of the spaceship would be greatest on Earth, where gravity is strongest.

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4.3A.

The easiest way to solve this problem is find the equivalent resistance for parallel resistor 1/Req = 1/R1 + 1/R2 + 1/R3 in the three-branch parallel network with branches whose resistance are 8Ω.

1/Req = 1/8 Ω + 1/8 Ω + 1/8 Ω

1/Req = 3/8 Ω

Req = 8/3 Ω = 2.667Ω

Req = 2.7Ω

So, the equivalent circuit will be the 20.0V battery in series with a resistor  2.0Ω and the equivalent resistor 2.7Ω.

Using Ohm's Law to find the current provide by the 20.0V voltage source:

V = I*R ------> I = V/R

I = 20.0V/(2.0Ω + 2.7Ω)

I = 20.0V/4.7Ω

I = 4.3A

Answer:

The answer is 18 N.

Explanation:

A force can be divided into components x and y components. The component along the x-axis is called the horizontal component and along the y-axis is called the vertical component. In this case, as the force is in a horizontal direction and is also known as x-component of force. The x- component of force is  

Fx = Fcosθ

Fx = 22(cos 35°)

Fx = 22 x 0.819

Fx =  18 N

Child's horizontal pull forces are equal to that of frictional resistance force on the wagon.

The force of friction on the wagon is 18 newtons, balanced by the child's horizontal force component.

To determine the magnitude of the force of friction on the wagon, we need to analyze the forces acting on the system. Because the wagon moves at a constant velocity, the net force acting on it must be zero according to Newton's First Law.

The child applies a net force of 22 newtons at an angle of 35 degrees to the horizontal. We can break this force into horizontal and vertical components:

Calculating the components, we get:

Since the wagon is moving at a constant velocity, the horizontal force exerted by the child (F_horizontal) must be balanced by the force of friction (f_friction).

Therefore, the magnitude of the force of friction on the wagon is 18 newtons.

Answer:amplitude

Explanation:

Answer:

The Constant is the amount of water and the light intensity.

Explanation:

Answer: The constant of her experiment is water and sunlight which are necessary for photosynthesis, both factor are common to both plants

Explanation:

Answer:

it depends only on the forces acting along the y axis I think

Answer:

option B

Explanation:

The correct answer is option B.                                                  

Assuming the motion of the object will be in the x-direction.                        

To move the object we need to apply the force on the body.                      

the line of action of the force should be in the x-direction to overcome the resistance to move the object.                                      

To calculate the force acting on electrons moving at right angles to a magnetic field, we use the formula F = qvB, considering the given values for the charge of the electron, velocity, and magnetic field strength. The calculated force is -4.68 × 10^-15 Newtons.

The question asks for the force acting on electrons moving at right angles to a magnetic field. To find the force, we use the formula F = qvBsin(θ), where F is the force on the charge, q is the charge of the electron (-1.6 × 10-19 coulombs), v is the velocity of the electron (6.5 × 106 meters/second), B is the magnetic field strength (4.5 × 10-2 tesla), and θ is the angle between the velocity and the magnetic field (90 degrees since they are at right angles). Since sin(90°) = 1, the equation simplifies to F = qvB. Plugging in the values, we get F = -1.6 × 10-19 × 6.5 × 106 × 4.5 × 10-2, which calculates to -4.68 × 10-15 Newtons.

Answer:

Water is very different from honey, syrup, glycerine, or oil. It pours easily and is not thick and sticky like the others. The property that determines how easily a liquid pours is called VISCOSITY. Water has a low viscosity; syrup has a high viscosity. Liquids with a high viscosity are said to be viscous.

The cold syrup flows sluggishly because syrup has a high viscosity.

Hence, cold syrup flows sluggishly because of its high viscosity.

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Answer:

230 kJ

Explanation:

The amount of heat needed to melt a substance at its melting point is:

[tex]Q=m\lambda_f[/tex]

where

m is the mass of the substance

[tex]\lambda_f[/tex] is the latent heat of fusion of the substance

In this problem,

m = 10.0 kg is the mass of the lead sample

[tex]\lambda_f = 23 kJ/kg[/tex] is the latent heat of fusion of lead

Substituting,

[tex]Q=(10.0 kg)(23 kJ/kg)=230 kJ[/tex]

Answer:

Q = 230 kJ

Explanation:

Heat required to melt a given matter at its melting point is given by latent heat of fusion

It will remain constant for a given metal

for lead the latent heat of fusion is given as

[tex]L = 23 kJ/kg[/tex]

now we know that

[tex]Q = mL[/tex]

here m = 10 kg

so heat required to melt 10 kg of lead is given as

[tex]Q = 10 \times 23[/tex]

[tex]Q = 230 kJ[/tex]

Interference is the phenomenon that can be explained by both the particle and wave models of light. It occurs when waves or particles overlap and interact.

The phenomenon that can be explained by both the particle and wave models of light is Interference (4). In the case of wave model, interference happens when two or more waves overlap together and the resulting electric field at that location is the vector sum of the fields due to the individual waves. In the case of particle model, when light acts as a particle, the individual light particles called photons interfere or interact with each other causing the Interference phenomenon.

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Both diffraction and interference can be explained by both the particle and wave models of light.

Particle and Wave Models of Light:

The phenomenon that can be explained by both the particle and wave models of light is diffraction. Diffraction occurs when light waves encounter obstacles or openings that are about the same size as the wavelength of the light. It causes the light to spread out and bend around the edges of the obstacle or opening.

Interference is another phenomenon that can be explained by both the particle and wave models of light. It occurs when two or more light waves combine and their amplitudes either reinforce or cancel each other out, resulting in areas of increased or decreased brightness.

The photoelectric effect can be explained by the particle model of light, where light is treated as a stream of particles called photons. The photoelectric effect occurs when light shines on a metal surface, causing the ejection of electrons from the atoms of the metal.

Reflection can also be explained by the wave model of light. When light waves encounter a boundary between two different media, some of the light is reflected back.

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Answer:

67.8 degrees below horizontal

Explanation:

In order to understand the direction of the ball after a certain time t, we need to find its horizontal and vertical components of the velocity.

- Horizontal component: the horizontal component of the velocity of the ball is constant, since there are no forces acting along this direction. Therefore, its horizontal velocity after t = 2 s is

vx = 8 m/s

- Vertical component: the vertical component of the velocity of the ball is given by

vy = u + at

where

u = 0 is the initial vertical velocity

a = g = -9.8 m/s^2 is the acceleration of gravity

Substituting t = 2s,

vy = 0 + (-9.8 m/s^2)(2s )=-19.6 m/s

where the negative sign indicates it points downward.

So, the direction of the ball (given as angle below the horizontal) is:

[tex]\theta = tan^{-1} (\frac{|v_y|}{v_x})=tan^{-1} (\frac{19.6 m/s}{8 m/s})=67.8^{\circ}[/tex]

The ball is moving in a downward arc but still maintains its original horizontal speed of 8m/s. Two forces are acting on the ball: the initial horizontal velocity and the force of gravity pulling it downwards. These two forces act independently of each other in an ideal scenario with no air resistance.

The ball, thrown horizontally from a cliff at 8m/s, will still be moving in a horizontal direction 2 seconds later. There are two forces acting on the ball once it's thrown: the initial horizontal velocity given to it (in this instance, 8m/s), and the force of gravity pulling it downwards. In an ideal scenario with no air resistance, these two forces act independently of each other.

Therefore, the horizontal component of the velocity remains constant, while the vertical component increases over time due to the Earth's gravity. It's important to note that while the direction of the ball's velocity is changing (since it's arcing downwards), the horizontal component of that velocity remains constant at 8m/s. The ball is moving in a downward arc but still maintains that original horizontal speed.

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Answer:

True

Explanation:

We are given the following statement which we are to determine if it is true or false:

'When work is done on an object, the object gains energy'.

The above given statement is true. The reason being that the object gains kinetic energy as a work is done on it or in other words, force is applied on it which moves it.

The work done on the object is equal to the kinetic energy gained by the object, given that there are no frictional forces.

When work is done on an object, the object gains energy.

In physics, when work is done on an object, the object gains energy. This is because work is defined as the transfer of energy. When a force is applied to an object and it moves in the direction of the force, work is being done on the object, and it gains energy as a result.

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The answer is:

The voltage of the source is 8.40 Volts.

To solve the problem, we need to use the Ohm's Law equation base formula.

We have that we can calculate the voltage using the following equation:

[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]

So, from the statement we know that:

[tex]Resistance=2.21\Omega\\Power=32W\\Current=3.8A[/tex]

Now, substituting and calculating we have:

[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]

[tex]Voltage(Volts)=3.8A*2.21\Omega=8.40V[/tex]

Hence, we have that the voltage of the source is 8.40 Volts.

Have a nice day!

The correct choice is  D .

"Thermonuclear" is the fancy word used to indicate nuclear fusion ... the source of energy in the so-called "H-bomb".

Fusion has everything going for it:  

-- The raw material it uses is Hydrogen, which is cheap, plentiful, and all around us (in water).

-- The waste products left over from the reaction are ... water and Hydrogen !  Which are totally non-polluting.

-- The reaction produces a ginormous amount of energy.

That's why scientists and engineers have have been working around the clock for the past 60 years to figure out a way to use nuclear fusion to produce cheap, clean energy for commercial use.  But we don't have it yet.

Why is that ?  The answer is:  Because nuclear fusion is a lot like the mythical "Universal Solvent".

Think about this:  If you discovered a substance that could dissolve ANYTHING, could you sell it ?  You'd think it would be pretty valuable, right ?

Yes it would.  But what could you keep it in ?

Nuclear fusion is something like that.  It produces SO MUCH energy that we haven't found a way to CONTROL it yet ... start it and stop it, keep it going when you want it to keep going, keep it in one place without destroying the building, and draw off some of the energy in a nice controlled process.  

Once we develop ways to operate a fusion reaction and control it safely, energy may become so cheap that it's not even worth putting meters on the outside of our houses.  But we're not there yet.

Answer:

Point A is at higher potential than point B

Explanation:

Electrons are negatively charged - this means that they are attracted by positive charges and repelled by negative charges.

This also means that they tend to move in a direction opposite to the electric field lines (because electric field lines point away from a positive charge and toward a negative charge). So, they also tend to move from a point at lower potential to a point at higher potential.

In this problem, the electrons flow from point B to point A: therefore, point A must have higher potential than point B.

That was pretty clever, how you neatly and cleanly cut off the part of the photo that shows the formula we're supposed to use.

At time=0, the position is zero, and at time=5 sec, the position is 20 m.

Slope = (change in position)/(change in time)

Slope = (20m - 0m) / (5s - 0s)

Slope = (20m) / (5s)

Slope = 4 m/s

Answer:

4

Explanation:

Answer:

Heat

It can burn things

Answer:

When the water flows in the dam or reservoir is not restricted or is impossible to restrict due to flood, earth quake or some other natural calamity, life is endangered both to human beings and animals as the water may pass through the forests and may even enter the cities and residential area when the limit is reached and the dam overflows.

Dam plays an vital roles on drinking water supply, flood control, electricity generation, fishing, tourism, etc. The creation of storage and head allow dams to generate electricity. Another situation is when the construction of the dam collapses due to structural failure or leaks.

Answer:

107,000 kilometers per hour.

Explanation: