Select the correct answer.
Anna will wear a black dress when she attends het cousin's wedding. Which color(s) does the dress absorb?
A.
all colors
B. no colors
C. red and green
D. white

Answer:

This means the temperature at which glycerine changes from solid to liquid is 13 degrees Celsius.

Explanation:

Melting point of a substance is the temperature at which it changes from the solid state to liquid state. Heat breaks the intermolecular forces of attractions that holds the substance together.The solid and liquid state are in equilibrium at the melting point. The melting point of a substance depends on pressure, shape of the substance, etc.

The melting point of glycerine at 13 degrees Celsius signifies the temperature at which it changes from solid to liquid at standard atmospheric pressure.

When the statement "the melting point of glycerine is 13 degrees Celsius" is mentioned, it's describing the temperature at which glycerine transitions from a solid to a liquid state under normal atmospheric pressure.

Unlike the triple point, which is the specific temperature and pressure at which a substance's solid, liquid, and gas phases coexist in equilibrium, the melting point is simply the temperature at which the solid and liquid phases are in equilibrium at 1 atm pressure.

For instance, the triple point of water is a more precise calibration temperature than its melting point because it is not influenced by pressure.

Answer:

If the an object is moving in such a way that the magnitude of its velocity is same but its direction is changing then the object is said to be moving with variable velocity. Uniform velocity is when an object has an equal distance and an equal interval of time in a specific direction it is said to have uniform velocity.

Answer:

They seek the path of lease resistance between opposite magnetic poles, in a single bar magnet they attempt to form closed loops from pole to pole and never cross each other.

Answer:

NOT:

If copper is a better conductor, it will heat up faster than iron.

Explanation:

Answer:

a=12 m/s²

Explanation:

Newton's second law of motion states that the acceleration of a body is directly proportional to the force applied and takes place in the direction of force.

This can be summarized as: F=ma, where m is the mass of the object on which force F acts. a is the acceleration due to the force applied.

12N= 1kg×a

a=12N/1kg

a=12m/s²

Answer:

It depends on the size and density but No.

Explanation:

Answer:

meter

kilometer

inch

Explanation:

The units can be used to measure length or distance are meter, kilometer and inch.

Length is the distance measured from one point to the the other.

Length is the fundamental unit of the physical system. It can be expressed in different units systems like SI, FPS or CGS

Thus, the units used to measure distance are meter, kilometer and inch.

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Answer:

[tex]v = 2.55\ m / s[/tex]  ↑   upwards

Explanation:

Take the direction up (where the hot-air balloonist moves) as the positive direction, and take the direction down (contrary to the direction of the hot-air balloonist) as the negative direction.

Then we propose the kinematic equation for the speed of the sandbag:

[tex]v (t) = v_0 + at[/tex].

Where

[tex]v_0[/tex] is the initial velocity of the sandbag

a is the acceleration of the sandbag

t is the time in seconds.

In this case

a is the gravitational acceleration of [tex]9.8\ m / s ^ 2[/tex]

[tex]v_0 = 5\ m / s[/tex]

[tex]t = 0.250\ s[/tex]

Now we substitute these values into the formula and solve for [tex]v(t)[/tex]

[tex]v = 5 + (-9.8) (0.250)\\\\v = 5 -9.8 (0.250)\\\\[/tex]

[tex]v = 2.55\ m / s[/tex]  ↑   upwards

In California, changing lanes in the middle of an intersection D. is legal.

Although it is legal, it's not necessarily the safest thing to do in an intersection.

In California, changing lanes in the middle of an intersection C. Is illegal

Changing lanes in driving refers to the act of moving your vehicle from one lane to another on a multi-lane road or highway. Drivers typically signal their intent to change lanes, check blind spots, and ensure it's safe to do so before making the maneuver to prevent accidents and maintain smooth traffic flow.

Changing lanes in the middle of an intersection in California is illegal. The proper and safe way to change lanes is before entering the intersection and when it is safe to do so. Changing lanes within the intersection can disrupt the flow of traffic and potentially cause accidents.

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Answer:

A. 4,440 N

Explanation:

A Force applied on an object with mass 'm' can change its velocity in a unit time. This change is called acceleration.

If a force 'F' is applied on a body of mass 'm', it produces an acceleration 'a' in the body.

Force is give as :

F = ma

In our case,

m = 1200 kg    a = 3.7 m/s²

F = 1200 x 3.7

F = 4440 kgm/s²

F = 4440 N

A force of 1 Newton is equivalent to 1 kg (m/s²). The product of mass and acceleration is known as force.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

Force is defined as the product of mass and acceleration. Its unit is Newton.

F=ma

The Si unit of the force is Newton. While the MKS unit is found as;

F=ma

F = kg (m/s²)

Hence, a force of 1 Newton is equivalent to 1 kg (m/s²).

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Answer:

a. gain potential energy and lose kinetic energy

Explanation:

Answer: gains potential and lose kinetic energy

Explanation:

Answer:

2.84 m/s

Explanation:

At the top position of the circular trajectory, the normal reaction is zero:

N = 0

So it means that the only force that is providing the centripetal force is the gravitational force (the weight of the bucket). Therefore we have:

[tex]mg = m \frac{v^2}{r}[/tex]

where

m is the mass of the water bucket

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

v is the speed of the bucket

r = 0.824 m is the radius of the circle

Solving for v,

[tex]v=\sqrt{gr}=\sqrt{(9.8 m/s^2)(0.824 m)}=2.84 m/s[/tex]

Answer: C. 14 volts

Explanation:

According to Ohm's law, the voltage [tex]V[/tex] is:  

[tex]V=R.I[/tex]   (1)

Where:

[tex]R=3.2\Omega[/tex] is the resistance of the clock

[tex]I=4.5A[/tex] is the electric current that flows throgh the clock

Substituting these values in (1):

[tex]V=(3.2\Omega)(4.5A)[/tex]   (2)

[tex]V=14.4V\approx14V[/tex]

Answer:

See image

Explanation:

Plato

The force at sea level that a boy of mass 40 kg exerts on a chair in which he is sitting is 390 N.

At sea level,

                                               m = 40 kg.

Therefore,

                                      w = [tex]40 kg *9.8 m/s^[/tex]

                                          =392 N kg

                                          = 392 N

392N means approximately 390 N.

Hence, the force at sea level that a boy of mass 40 kg exerts on a chair in which he is sitting is 390 N.

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Final answer:

To calculate the force exerted by a 40 kg boy sitting on a chair at sea level, multiply the boy's mass by the acceleration due to gravity (9.80 m/s²) to get 392 N, which is rounded to 390 N, following significant figure rules.

Explanation:

Calculating Force at Sea Level

To calculate the force at sea level that a boy of mass 40 kg exerts on a chair in which he is sitting, we apply Newton's second law of motion. Since we are considering his weight (the force due to gravity), the acceleration in this case is due to Earth's gravity, which is approximately 9.80 m/s². Therefore, the formula to calculate the force (F) is:

F = m x g

Where:

m is the mass of the boy and is given as 40 kg.

g is the acceleration due to gravity and is 9.80 m/s².

Now, we calculate the force:

F = 40 kg x 9.80 m/s² = 392 N.

Following significant figure rules, we round our answer to 2 significant figures because the mass was provided to 2 significant figures. Thus, our final answer is:390 N

Answer:

If they were reduced to the levels like those during the ice ages, I think the Earth might go back to being frozen again.

Right now, what make the glaciers and polar ice caps melt?

Global Warming and greenhouse gases are depleting the Ozone. The Ozone is what traps the heat from the Sun and radiates it back to the Sun. Greenhouse gas is depleting the Ozone, which means that the heat from the sun is less protected, which results in climate change. It makes the Earth hotter which can mean that the glaciers are melting because the climate in the North and South pole is way to hot for it to stay frozen.

Hope this helped!

Answer: Earth would become frozen and also greenhouse gases reduce the ozone layer which is why  glaciers are melting and Earth is getting hotter. It is why greenhouse gases are a big issue.

Answer:

Sometimes the correct answer is there, as is, but the test has a different answer. Tell the teacher that the computer had the wrong answer.

Answer:

D) light from other galaxies is red shifted

Explanation:

The Doppler effect indicates that the universe is expanding because light from other galaxies is red shifted.

Hope this helps!

I took the test.

Light intensity is the "amount of light given off a light source." Also, is the measure the wavelength of the amount of light given off by a light source.

Hope this helps.

It's the brightness of something, and is measured as the rate at which light energy is delivered to a unit of surface, or energy per unit time per unit area.

Answer:

thick wire and cold temperatures

Answer: There may be two types of resistances here:

Air resistance: for example when something is falling down, the air will push the object upwards. As a bigger surface has the object, more air is pushing, so if you want to reduce the resistance yo must reduce the surface area. For example, a sheet of paper will experience more resistance if it is open if you make a small ball with it.

Electric resistance: This is the resistance of conductors against the electrons that try to travel along with it.

there are two equations here.

R = p*L/A, this talks about the volume and density of the conductor, where p is the density, L is the length and A is the area perpendicular to the direction in which the electricity flows.

Then if you reduce the length, and increase the area, the resistance will be reduced.

the other equation is: R(T) = R0( 1 + a*(T - 20°))

Where R0 is the resistance at 20° and a is a coefficient for T = 20°.

Here, you can see that at smaller temperatures, the resistance decreases, so we can conclude that we must increase the area, and decrease the length and temperature.

Elements in Group VIIIA (noble gases) have similar properties because they all have full octets in their outer energy shells, making them extremely unreactive due to having complete valence electron configurations.

Elements in Group VIIIA, also known as Group 18 or the noble gases, have similar properties because they all have full octets, which means their outer energy shells are complete. This results in them being very unreactive. The similarity in chemical properties among elements of the same group occurs because they have the same number of valence electrons, which determines how they react.

Answer: Charge and distance between them

Explanation: edge 21

Charge and distance between them affect the electrical force between two objects.

An electrical force is a force that acts between objects that have an electric charge. This force is a result of the interaction between the charges of the objects, and it can either be attractive or repulsive depending on the charges of the objects.

The electrical force between two objects is determined by their charges and the distance between them. The strength of the electrical force is proportional to the magnitude of the charges and inversely proportional to the square of the distance between the objects. This relationship is described by Coulomb's law, which states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between the charges.

The masses of the objects do not directly affect the electrical force between them. However, the masses of the objects can affect the direction of the electrical force if they are moving, as the force will cause a change in the motion of the objects. The electric field strength is a measure of the strength of the electric force per unit charge and is proportional to the charge density of an object. The electric field strength is not directly related to the mass of an object, but it can be affected by the presence of other charges in the vicinity.

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Answer:

The combining of light nuclei is called nuclear fusion.

Answer:

Fusion

Explanation:

The combination of two lighter nuclie and forms a new heavier nucleus and release and lot of amount of energy is called nuclear fusion.

To start the nuclear fusion reaction we need a very high temperature.

We get energy from sun, it is due to the nuclear fusion of hydrogen and forms helium.

Answer:

Answer is freezing point of water. The same melting point of ice is the same freezing point of water.

Answer:

Freezing point.

Explanation:

In the case of freezing point and melting point there is a same transition of matter. In this case, freezing point is defined as the, liquid is changing into solid and this process will occur  at the same temperature when melting is occur means solid is change into liquid.

When water is freezing or melting any one can notice that its temperature will remain at 0°C throughout these processes whether ice is converting into liquid or liquid is converting into ice.

In physics, 'work' is a force causing the motion of an object. For work to be done, there must be displacement in the direction of the applied force. In the scenario presented, the situation in which no work is done is when a person is carrying a box from one place to another, as the force and displacement are perpendicular to each other.

The concept of 'work' in physics is different from the everyday usage of the term. In physics, work is defined as a force causing the motion—or displacement—of an object. In the concept of work, two key components need to be present: force and displacement in the direction of the force.

With this definition, the scenario where no work is being done is: A. a person carrying a box from one place to another. In this situation, regardless of the weight of the box, if the person carries it horizontally, the force exerted (which is vertically upwards, opposing the weight of the box) and the displacement of the box (which is horizontal) are perpendicular to each other. Since work done is the product of force, displacement, and the cosine of the angle between them, when force and displacement are at 90 degrees, the cosine of the angle is zero and the work done is zero.

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Answer:

the items you connect to a household outlet.

Explanation:

There exists many devices that uses AC current to operate. For example:

1. Electric Clocks. Synchronous clocks rely on the 50 or 60 Hz utility frequency of the AC electric power grid as a timing source. There are cases in which Power Plants decreases its frequency (Most of the times because of a failure), and for that reason you will find that electric clocks are delayed.

2. Fridge. Yes, your fridge needs AC current to work, that's why it's connected to your outlet!

3. Microwave. Yes, also your microwave needs AC current to work.

Basically, all of the items you connect to an outlet works with AC current.

Answer:

acid rain.

Explanation:

its kinda obvious.

Answer:

Force will be 32N

Explanation:

The equation used is F = ma where m is mass and a is acc.. We just multiply mass( in Kg as Kg is SI unit )by acc. and get the force required .

Answer:

An orderly, systematic approach to problem solving is called the. Scientific method.

"Scientific method" would be the systematic approach to solve the problems.

Thus the response above is correct.

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Igneous intrusions form when magma cools and solidifies before it can reach the surface. An extrusion consists of extrusive rock; which forms above the surface of the crust.