Is a typical refrigerator door made of iron or aluminum? Explain.

Answer:

Speed

Explanation:

Answer:

frequency

Explanation:

- Atom X will accept electrons from Atom Y.

Answer:

Atom X will accept electrons from Atom Y is correct!

Answer:

Zooflagellates belong to the phylum Protista.

Answer:

The one with highest velocity

Explanation:

The momentum of an object is given by

[tex]p=mv[/tex]

where

m is the mass of the car

v is the velocity of the car

In this problem, we have two identical cars: identical means they have same mass, so

[tex]m_1 = m_2 = m[/tex]

The momentum of car 1 is

[tex]p_1 = mv_1[/tex]

while the momentum of car 2 is

[tex]p_2 = mv_2[/tex]

By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.

The answer here is true

Final answer:

Refraction is the bending of light waves as they pass from one medium to another and involves a change in speed and direction, not amplitude. The statement provided is false.

Explanation:

The statement provided by the student is false. Refraction is the bending of light waves, which occurs when a light wave passes from one medium to another, such as air to glass. The key aspect of refraction is the change in direction of the wave due to a change in its speed as it moves between media with different densities. However, refraction does not involve a change in the amplitude of the wave, but rather a change in the wave's speed, and, consequently, its wavelength. Moreover, the frequency of the wave remains constant during this process.

Answer:

The class and order levels are switched

Explanation:

Woese's classification starts with a division in three parts of all the organisms, which is their domain, so according to him there's Bacteria, Archaea, and Eukaryota. After the domain we have the kingdom, then phylum, class, order, family, genus, and species at the end.

We can take the leopard as an example:

Domain - Eukaryota

Kingdom - Animalia

Phylum - Chordata

Class - Mammalia

Order - Carnivora

Family - Felidae

Genus - Panthera

Species - Panthera pardus

Answer:

The correct answer is: Water has a higher boiling point than carbon dioxide does.

Explanation:

Ok, because water is a polar molecule and its bonds are hydrogen bonds, this causes its boiling point to be higher than that of carbon dioxide, since hydrogen bonding is more resistant to rupture (in this case when heating), on the other hand carbon dioxide has convalent bonds, which are weaker. Therefore, the water will have a boiling point higher than that of carbon dioxide, since it costs more to break its polar bonds. This will also be true for any molecule that has hydrogen bonding links and is polar.

Answer:

sound energy

Explanation:

Answer:

sound energy perriod

Answer:

When an object changes speed (increases/decreases) it results in acceleration/de acceleration, its velocity also changes.

Explanation:

Acceleration is the rate of change in velocity.An object can accelerate when speed increases, decreases or direction changes. All these instances involves a change in velocity.Velocity is a vector quantity thus it has magnitude and the direction.Acceleration due to change in direction is centripetal acceleration.The expression for finding acceleration is;

a=change in velocity/change in time

a=Δv/Δt in m/s²

Answer:

direction and velocity

Answer:

What is the centripetal acceleration of the tip of the fan blade?

6.0 m/s2

48 m/s2

53 m/s2

96 m/s2

Answer is 96

Explanation:

Answer:

d

Explanation:

edge sample response for lab :

If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.

If the mass of the cart is increased, then the acceleration of the cart is decreased and vice versa

The mass of a cart is inversely proportional to the acceleration of the cart. Inverse proportionality means that increase in one quantity leads to decrease in the other quantity.

Hence, if the mass of the cart is increased, the acceleration of the cart increases and if the mass of the cart is decreased, the acceleration of the cart is increased.

The force applied to an object is directly proportional to the acceleration given to the object when the mass of the object is kept constant. F= ma

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The curve at the liquid's surface by which you measure the volume of a liquid.

Answer:Constructive interference results in a wave with a greater amplitude than any of the component waves.

Explanation:

Answer:

The Rabbit!

Explanation:

Because primary consumers (the rabbit) consume producers (the grass).

In the given food chain Rabbit is the primary consumer.

Explanation:

Primary consumers are herbivore which will consume plants that produce their food using photosynthesis. A primary consumer feeds on primary producers. The food chain is the consumption chain from producer through level of consumers.

Some of the examples of primary consumers are as follows,

The wires is what is needed to put together the whole thing, kinda like glue when you're gluing a piece of paper on it.

Anyways, the battery is the main source and main energy per say.

That energy that comes from the battery, thanks to the wires, it can transfer that said energy to both the switch and light bulb.

And as you flick the switch, it depends of how you put it together, there's two options, turning the light bulb on or turning it off.

Though it doesn't mean that since the light bulb is connected to the battery makes the bulb turn on no matter what since the switch can cancel the main source's energy.

- Ouma :>

Answer:

15

Explanation:

The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.

The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.

The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.

This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.

Answer:

Kilowatt per hour

Explanation:

The energy is equal to the power by time.

[tex]E=\frac{P}{t}[/tex]

It says: The bigger the distance between objects the smaller the gravity between them.

Answer: Solids, liquids, and gasses.

Explanation:

well a mechanical wave is a disturbance in matter that carries energy from one place to another, and a medium (or media because you put the question in pluralised form) is matter through which a wave travels. So, Solids, liquids, and gasses.

Given,  

Initial Velocity (u) = 0 m/s  

Final Velocity (v) = 25.9 m/s  

Time (t) = 2.5 sec  

avg. acceleration = ?  

avg. acceleration = v-u/t  

avg = 25.9/2.5 = 10.36 m/s²  

avg = 10.36 m/s²

Answer:

Acceleration, [tex]a=10.4\ m/s^2[/tex]

Explanation:

Given that,

Initial velocity of the ride, u = 0 (at rest)

Final speed of the ride, v = 22.9 m/s

Time taken, t = 2.2 s

Let a is the acceleration of the passengers on this ride. It can be calculated using the formula of the acceleration as :

[tex]a=\dfrac{v-u}{t}[/tex]

[tex]a=\dfrac{22.9-0}{2.2}[/tex]

[tex]a=10.4\ m/s^2[/tex]

So, the time required to bring the car to a stop is [tex]10.4\ m/s^2[/tex]. Hence, this is the required solution.

Answer:

In any energy transformation, energy is the change of energy from one form to another.

In any energy transformation, energy is Conduction.

The conversion of one form of energy into every other, or the motion of electricity from one location to every other. A strength transformation is the change of strength from one shape to any other. The cloth that doesn't conduct warmness, electricity, light, or sound. electricity or pressure an object has because of its motion.

Conduction is the system via which warmness electricity is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more with ease in solids and drinks, in which the particles are closer collectively than in gases, in which debris are similarly apart.

Conduction is the switch of power from one molecule to another by direct contact. This switch happens when molecules hit each differently, much like a game of pool where one moving ball strikes the other, causing the second to move.

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Answer:

Explanation:

Draw a free body diagram for the painter.  There are three forces acting on him.  The tension in the rope pulling him up, the normal force of the chair pushing him up, and gravity pulling him down.

Apply Newton's second law:

∑F = ma

T + N - W = ma

Since the painter is at rest, a = 0.

T + N - W = 0

T = W - N

T = Mg - N

Now draw a free body diagram of the chair.  The chair has three forces acting on it also.  The tension in the rope pulling it up, the normal force pushing down, and gravity pulling down.

Newton's second law for the chair:

∑F = ma

T - W - N = ma

Since the chair is also not accelerating, a = 0:

T - W - N = 0

T = W + N

T = mg + N

Now we have two equations and two variables.  If we add the equations together, we can eliminate N:

2T = Mg + mg

2T = (M + m) g

T = (M + m) g / 2

Given that M = 55 kg, m = 10 kg, and g = 9.8 m/s²:

T = (55 + 10) (9.8) / 2

T = 318.5 N

If we round to two sig-figs, the tension in the rope is 320 N.

The tension in the rope is 637 Newtons, which is the total weight of the painter and chair multiplied by the acceleration due to gravity (9.8 m/s^2). This is because the system is at rest, so the tension in the rope must balance out the downward force of gravity.

The subject of this question is Physics, specifically when discussing forces and tension in ropes. The situation describes a house painter who is on a chair, lifted by a pulley system, and the entire system is at rest. We assume that the only forces acting on the system are gravity and the tension in the rope.

Both the painter and the chair are experiencing a downward force due to gravity. We can calculate this by multiplying their mass by the acceleration due to gravity (which is about 9.8 m/s^2 on Earth). For the painter, this is 55 kg * 9.8 m/s² = 539 N. For the chair, it is 10 kg × 9.8 m/s² = 98 N.

Because the system is at rest, the rope must be exerting an equal and opposite force upwards, to balance out the force of gravity. This force is the tension in the rope. If we add up the forces acting on the painter and the chair, we get a total of 539 N + 98 N = 637 N. So, the tension in the rope is 637 Newtons.

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Answer:

B. The weight of the balloon is less than the weight of the air displaced by the balloon.

Explanation:

Hot air balloons rise because of buoyancy (The force that cause objects to rise in the air). In order for the balloon to float, in needs to be lighter (less dense) than the surrounding air. By adding lighter hot air, It's causes the balloon to have less weight that the air it displaces.

Answer:B.

The weight of the balloon is less than the weight of the air displaced by the balloon.

Explanation:gradpoint

Answer:

what are the statements

Explanation:

Answer:

Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom

Explanation:

Rutherford's experiment was to bombard a gold foil with alpha particles, finding that most of the particles change their direction very little, some change it a lot and very few almost recede; With these measurements he came to the conclusion that almost the entire mass of the atom had to be in a very small space that I call a nucleus, in addition as the alpha particles have two positive charges so that there is a force of repulsion the charge of the nucleus must also be positive; with this I enunciate an atomic model:

 Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom

Answer:

D species

Explanation:

According to the most widely used species definition, the biological species concept, a species is a group of organisms that can potentially interbreed, or mate, with one another to produce viable, fertile offspring. In this definition, members of the same species must have the potential to interbreed.

Answer:

1.43 m/s², 10,300 N

Explanation:

First things first is to draw a picture.  Fortunately, one was already provided.

Next, we need to draw a free body diagram for each mass.

The 1200 kg mass has two forces acting on it: tension pulling up and weight pulling down.

Similarly, the 900 kg mass has two forces acting on it: tension pulling up and weight pulling down.

Now we apply Newton's second law.  Let's start with the 1200 kg.  If we say that up is positive, then:

∑F = ma

T - W = M(-a)

T - Mg = -Ma

Notice that I made the acceleration negative.  That's because we know that the heavier mass will be accelerating down.

Now we apply Newton's second law to the 900 kg mass:

∑F = ma

T - W = ma

T - mg = ma

Now we have two equations and two unknowns (T and a).  Let's solve for the acceleration first.  To do that, let's subtract the two equations so we can eliminate T (if you prefer, you can also use substitution instead):

-mg − (-Mg) = ma − (-Ma)

-mg + Mg = ma + Ma

g (M - m) = a (M + m)

a = g (M - m) / (M + m)

Given that M = 1200 kg, m = 900 kg, and g = 10 m/s²:

a = 10 m/s² (1200 kg - 900 kg) / (1200 kg + 900 kg)

a = 10/7 m/s²

a ≈ 1.43 m/s²

Now let's find the tension by plugging our answer into either of the two equations.

T - mg = ma

T - (900 kg) (10 m/s²) = (900 kg) (10/7 m/s²)

T = 72000/7 N

T ≈ 10,300 N

I'm not sure what rounding rules you need to follow, but hopefully this helps.

a) [tex]60 \Omega[/tex]

The total resistance of resistors connected in series is equal to the sum of the individual resistances:

[tex]R=R_1 + R_2 + .... + R_n[/tex]

In this problem, we have two resistors connected in series:

[tex]R_1 = 15 \Omega[/tex]

[tex]R_2 = 45 \Omega[/tex]

So the total resistance of the circuit is

[tex]R=R_1 + R_2 = 15 \Omega + 45 \Omega = 60 \Omega[/tex]

b) 6.0 V

The relationship between voltage, current and resistance of a circuit is given by Ohm's law

[tex]V=RI[/tex]

where

V is the voltage

R is the total resistance

I is the current

In this circuit, we have

[tex]R=60 \Omega[/tex] is the total resistance

I = 0.1 A is the current

So, the voltage of the battery is

[tex]V=(60 \Omega)(0.1 A)=6.0 V[/tex]

Answer:

B and D

Explanation

Gravitational potential energy does not relate to graphs and it is about a moving object so b and d would not be correct

The option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.

The force needed to move an object multiplied by the distance traveled is not a direct equation for the gravitational potential energy. The position or height of an object within a gravitational field, rather than the force used to move it, determines the gravitational potential energy.

Gravitational potential energy is directly related to the work involved in lifting an object against the force of gravity, and its size is inversely proportional to the work involved in lifting an object. The change in potential energy is equal to the quantity of work that is completed.

It depends on the coordinate system chosen: The choice of a reference point or a location with zero potential energy in a selected coordinate system determines the gravitational potential energy. Usually, this reference point is placed at a suitable area, like the Earth's surface.

It is equivalent to the falling object's kinetic energy at y = 0: As an item descends to a reference point where its potential energy is zero, gravitational potential energy can be totally converted to kinetic energy. According to the principle of energy conservation, the potential energy is completely transformed into kinetic energy at that point (y = 0).

Hence, the option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.

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the answer is d because it has the smallest wavelength

Explanation:

Mechanical wave are the waves that requires a medium for its propagation. The energy of wave is given by the following formula as :

[tex]E=\dfrac{hc}{\lambda}[/tex]

Where

h = Planck's constant

c = speed of light

[tex]\lambda[/tex] = wavelength

So, the energy of wave is inversely proportional to its wavelength.

From the given figure, the distance between two consecutive crests and trough is minimum in figure (4). So, figure (4) has most energy.

Answer:

Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.

Explanation:

Answer:

Longitudinal waves travels faster through solids than it does through gases

Explanation:

As we know that longitudinal waves travels through all types of mediums and the speed of longitudinal waves is given as

[tex]v = \sqrt{\frac{E}{\rho}}[/tex]

here we know that

E = elasticity of the medium

[tex]\rho[/tex] = density of the medium

now here we know that elasticity of solids is much more than the elasticity of gases

So the speed of longitudinal waves in solids is more than the speed of waves in gases