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Which of the following characteristics do all of the outer planets have in common?

A) They have many moons.

B) They are small and solid.

C) They rotate slowly and are large and solid.

D) They rotate quickly and are large and gaseous.

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: it depends on there orgin and where there records say they shall be buried. For example, if your records say that you want to be buried in this specific location is requried by law to be buried there

Hope this helps :D

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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Answer:

Explanation:

Firstly, we need the specific heat capacity of water which is typically around 4200J/kg (if the mass is in kg) or 4.2 J/g ( if mass is in g)

The formula for the heat energy needed is

E=mct

Where E is the heat energy, m is the mass of water, c is the specific heat capacity and t is the change in the temperature.

E= 6 x 4.2 x 15

= 378 J

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Feel free to ask any follow up questions!

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.

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:

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:

107,000 kilometers per hour.

Explanation:

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:

[(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:

The answer is: John Dalton

John Dalton considered the father of atomic theory

Hope this helped :) <3

Explanation:

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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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!

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:amplitude

Explanation:

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.

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:

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.                                      

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.

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.

Hope this helps.

r3t40

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]

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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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:

this should be it hope it helps

The representative model can be used to demonstrate the object or event or an idea to the people making them understand better.

Explanation:

Model representation is the best way to make people understand the idea or the event as verbal listening do not target the sense in much deeper way as the visual effect do.

The people will grasp of the model very easily as they could see it and they are not required to imagine. While imagining the event or the idea, half of the senses are involved in it and let the individual understand less.  

An electric motor converts electrical energy into mechanical energy using magnetic fields and current-carrying conductors, is used in appliances with moving parts, and is not powered by a hand crank.

An electric motor is a device that is designed to convert electrical energy into mechanical energy option A. This transformation occurs through the interaction of magnetic fields and current-carrying conductors. The basic operation of an electric motor involves loops of wire within a magnetic field. When an electric current passes through these loops, a torque is exerted on them, which in turn rotates a shaft connected to the motor. Through this process, the electrical energy used to create the current is converted into the mechanical work needed to turn the shaft.

Electric motors are widely used in various applications such as industrial machinery, household appliances like vacuum cleaners or blenders, and many other devices that require moving parts. These motors are based on the principles of magnetic force exerted on the wire loops. However, they are not powered by a hand crank; that is a feature associated with generators, which convert mechanical energy into electrical energy.

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:

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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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.