Physics High School

On Earth, water can exist as a solid, a liquid, or a gas. Why?

Answers

Answer 1

Molecules in liquid don't all have the same energy, this is why water on Earth can exist as a solid, liquid or gas.

Answer 2

Explanation:

The Earth has perfect conditions which allows water to exist in all the three states. These conditions are:

1. Earth is in the Goldilocks zone around the Sun which results in an optimum temperature.

2. The atmosphere of the Earth maintains suitable temperature and pressure.

The presence of water in all the three forms helped the life to develop on Earth.

Related Questions

All the colors of visible light can combine to form white light.
a. True
b. False

Answers

Yes, it's true. You can see that it is true when you go outside during a summer rain and see a rainbow. That occurs when the the water acts like a lens and separates the light into its component colors. If you have gotten this far in your studies, the index of refraction through water is different for each color which is the way to explain the different colors of the rainbow.

On a 600-mile, a pilot can save 30 minutes by increasing her usual speed by 40 mph. find her usual speed

Answers

217.1 mph that is his usual speed

Which of the following helps explain why the planets remain in motion around the sun?

A. density
B. gravity
C. inertia
D. both gravity and inertia

Answers

Um I think it is D both gravity and inertia. Hope this helped

D is the answer hope helps

Why is it inadvisable to make a horseshoe magnet from a flexible material? 1. a flexible material is not easily magnetized. 2. a flexible material is easily loses its magnetism. 3. none of these 4. the poles of the magnet attract each other and will cause the magnet to bend. 5. a flexible material cannot be easily made into a horseshoe shape?

Answers

Different magnetic poles are drawn to one another. The magnet will bend if it is too flexible, possibly allowing the poles to touch and reducing the magnetic field around it.

What horseshoe magnet from a flexible material?

Since a horseshoe magnet's design naturally provides more strength than a bar magnet does, it quickly superseded the bar magnet in use. The magnet's poles are situated closer to one another and in the same plane thanks to the U-shape.

The majority of horseshoes are constructed of steel, though there are a few outliers. Because aluminum horseshoes are lighter and perform better when speed is the primary goal, racehorses typically wear them.

At the magnet's poles are concentrated its strongest elements. Because of this, a horseshoe shape is thought to be the strongest.

Therefore, particularly handy to produce if you need to carry heavy goods or strengthen a bar magnet.

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Read each scenario and then answer the questions. Scenario A: A shopping cart is pushed a distance of 3 m by a force of 15 N. Scenario B: A shopping cart is pushed a distance of 4 m by a force of 12 N. Scenario C: A shopping cart is pushed a distance of 6 m by a force of 10 N. Which scenario requires the most work? Which scenario requires the least work?

Answers are C and A

Answers

To solve this we are going to use the formula for work: [tex]W=Fd[/tex]
where
[tex]W[/tex] is the work done
[tex]F[/tex] is the force
[tex]d[/tex] is the distance

Scenario A. We know for our problem that [tex]F=15N[/tex] and [tex]d=3m[/tex]. Lets replace those values in our formula to find [tex]W[/tex]:
[tex]W=15N*3m[/tex]
[tex]W=45J[/tex]

Scenario B. We know for our problem that [tex]F=12N[/tex] and [tex]d=4[/tex]. Lest replace those value in our formula:
[tex]W=12N*4m[/tex]
[tex]W=48J[/tex]

Scenario C. We know for our problem that [tex]F=10N[/tex] and [tex]d=6m[/tex]. Lets replace the values in our formula:
[tex]F=10N*6m[/tex]
[tex]F=60J[/tex]

We can conclude that:
- The scenario that requires the most work is C.
- The scenario that requires the least work is A.

Answer:

Read each scenario and then answer the questions.

Scenario A: A shopping cart is pushed a distance of 3 m by a force of 15 N.

Scenario B: A shopping cart is pushed a distance of 4 m by a force of 12 N.

Scenario C: A shopping cart is pushed a distance of 6 m by a force of 10 N

Which scenario requires the most work?

Answer: Scenario C

Which scenario requires the least work?

Answer: Scenario A

(Psychology).

Learning to listen and speak to other people can be considered part of the _____ and the _____ dimensions of development.

A. moral; physical

B. cognitive; physical

C. moral; psychosocial

D. cognitive; psychosocial

Answers

The answers on the blanks in the statement Learning to listen and speak to other people can be considered part of the _____ and the _____ dimensions of development.
Would be D. cognitive; psychosocial. Listening would be a good aspect on the cognitive part of the mind and if you will learn how to speak to others, it will develop a psychosocial aspevt of your personality.

Learning to listen and speak to other people can be considered part of the C. moral and the psychosocial dimensions of development.

In the context of development, the moral dimension refers to the development of personal values, standards, and an understanding of right and wrong. This dimension is crucial for social interactions and understanding the perspectives and feelings of others, which is essential for effective communication. The psychosocial dimension of development involves the growth of one's personality, social skills, and the ability to form relationships with others. It encompasses the process of learning to listen and speak to other people, as these are fundamental social skills that enable individuals to interact and communicate effectively within their social environment.

Mosses are located in which zone of deciduous forests?

a. tree stratum

b. ground

c. shrub

d. herb

Answers

Its B- Ground, just took the test

Answer;

Ground

Explanation;Mosses are located in the ground zone of the deciduous forests.Deciduous forests is a biome that has a soil that is rich and the leaves are dropped from the trees to provide a source of organic matter for the soil.Mosses plants are types of plants which belongs to the bryophyta group of plants. They lack roots and are evergreen plants that grow in a wide range of environments but are commonly found covering the ground, along the stream beds, and also at the bases of the trees in deciduous forests.

a car has a mass of 12,000 kg. What is it’s acceleration when the engine exerts a force of 600 N? (Formula: F=ma)

Answers

the answer to this is .05

m = 12000kg
F = 600N

F = ma

substitute for them and you'll get

600 = 12000a
1/20= a
a = 0.05.

Therefore, the acceleration is equal to 0.05m/s^2.

An amplifier has a 50 watt output and a 5 watt input. what is the gain in decibels for this amplifier, rounded to the nearest decibel?

Answers

Gain in decibels is given by;

Gain db = 10*log (Po/Pi), where Po = Power output, Pin = Power input

Substituting;

Gain in db = 10 * log (50/5) = 10 db

ASAP Which of the following has kinetic energy? a. a rock poised for a fall b. an archer’s bow that is drawn back c. a rolling bowling ball d. a car waiting at a red light

Answers

The answer would be C.

Final answer:

The correct answer is c. a rolling bowling ball.

Explanation:

The correct answer is c. a rolling bowling ball.

Kinetic energy is the energy an object possesses due to its motion. It depends on the mass and velocity of the object. In this case, a rolling bowling ball has kinetic energy because it is moving. The other options do not involve motion and therefore do not have kinetic energy.

For example, a rock poised for a fall has only potential energy, as it does not possess motion. An archer's bow that is drawn back also has potential energy stored in the stretched bowstring, but it does not have kinetic energy until the arrow is released. A car waiting at a red light is stationary and not in motion, so it does not have kinetic energy.

If a television with mass 15kg is lifted to a shelf of height 1.2m how much gravitationallyl potential energy is added to the television

Answers

Its potential energy is 176.4J.

A photon

a. is a quantum of light
b. is a wave
c. means bundle of energy

Answers

A photon is a quantum of light, it is also a wave and it is packet of energy. Hence all option is correct.

What is Photon ?

Photon is a particle which is associated with light wave, it carries both energy as well as momentum. Photon is quantum of light. when a photon moves in the medium it moves as a wave. hence it has dual nature as particle and wave. when light travels in the medium numbers of photons called as bundle of photons travels.

Hence photon is a wave, quantum of light and bundle of energy.

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What linear speed must an earth satellite have to be in a circular orbit at an altitude of 159 km?

Answers

Gravitational acceleration, g = GM/r^2. Additionally, for a satellite in a circular orbit, g = v^2/r

Where, G = Gravitational constant, M = Mass of earth, r = distance from the center of the earth to the satellite, v = linear speed of the satellite.

Equating the two expressions;
v^2/r = GM/r^2
v = Sqrt (GM/r);
But GM = Constant = 398600.5 km^3/sec^2
r = Altitude+Radius of the earth = 159+6371 = 6530 km

Substituting;
v = Sqrt (398600.5/6530) = 7.81 km/sec = 781 m/s

During the early 1800s, these professionals regularly appeared in court to answer questions related to physical evidence.

chemistry

forensic science

legal

medical

Answers

Final answer:

In the early 1800s, forensic scientists, such as chemists and medical doctors, began to provide evidence in court related to physical evidence from crime scenes. Option b

Explanation:

During the early 1800s, forensic science was a field where professionals, including medical doctors and sometimes chemists, provided scientific evidence in courts to assist legal proceedings.

These individuals would analyze physical evidence from crime scenes, such as hair, blood, and other body fluids, and increasingly, DNA. They played crucial roles in determining the facts of criminal cases by examining forensic evidence left at crime scenes.

This period marked the beginning of the systematic application of science to legal processes, a practice that would grow significantly with advancements in technology and methodology. Option b

An airplane flies 930 miles in 75 minutes. how many miles does it fly in 5 hours and 45 minutes assuming a constant speed?

Answers

Let's convert the second time into minutes. 5 hours corresponds to
[tex]5 h \cdot 60 m/h =300 m[/tex]
So the second time is
[tex]t_2 = 5 h 45 m = 300 m + 45 m = 345 m[/tex]

We can now solve the problem by using a simple proportion. We know that the plane takes 75 minutes to fly 930 miles, so the distance covered in 345 minutes is given by
[tex]930 miles : 75 min = x : 345 min[/tex]
[tex]x= \frac{930 miles \cdot 345 min}{75 min} =4278 miles [/tex]

Final answer:

First, calculate the average speed of the airplane, which is 12.4 miles per minute. Then, convert 5 hours and 45 minutes into minutes which is 345 minutes. Multiple the speed by this time to find the distance the airplane would fly, which is 4278 miles.

Explanation:

To solve this problem, we first need to figure out the average speed of the airplane. Average speed is calculated by dividing the total distance by total time. In this case, the airplane travels 930 miles in 75 minutes. So the speed is 930 miles/75 minutes = 12.4 miles/minute.

Now that we have the speed per minute, we can calculate how many miles the airplane would travel in 5 hours and 45 minutes. This time converts to 345 minutes (since 1 hour = 60 minutes). So, the airplane would fly 12.4 miles/minute * 345 minutes = 4278 miles.

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A current of 1.8 A delivers 2.5 C of charge. How much time was required?
A.0.70 S
B.0.72 S
C.1.4 S
D..5 S

Answers

The current is defined as the amount of charge that flows through a given point in a certain time interval:
[tex]I= \frac{Q}{\Delta t} [/tex]
where Q is the charge and [tex]\Delta t[/tex] the time interval.

In our problem, I=1.8 A and Q=2.5 C, therefore we can find the time interval by re-arranging the previous formula and plugging these numbers into it:
[tex]\Delta t= \frac{Q}{I}= \frac{2.5 C}{1.8 A}=1.4 s [/tex]

Therefore, C) is the correct answer.

Answer: C

Explanation:

What is the speed of sound in air at 40°C? 355 m/s 307 m/s 331 m/s 239 m/s

Answers

The ans is A. 355 m/s as temperature is above stp

Speed of sound is dependent on air temperature n goes up as it gets warm.

At 40°C, it is 355 m/s

What was the weight, range, and cruising speed of “the big e?

Answers

The weight : 21,000 tons standard 32,060 tons full load
The Range : 12,500 nautical miles
Cruising Speed : 15 knots
USS Enterprise (CV-6) was the seventh U.S. Navy vessel to bear the name. Nicknamed "the Big E", she was the sixth aircraft carrier of the United States Navy.
.

Answer:

Weight = 94,780 tons

Range = 12,500 nautical miles

Cruising speed = 62.2 km/h

Explanation:

Big E was nickname of USS Enterprise CVA(N) - 65 aircraft carrier. It is a nuclear -powered air craft and eighth United States Naval vessel.

In situations where the plane of projection is not parallel to the surface of the object, the resulting orthographic view is ____.

Answers

The resulting orthographic view is foreshortened.

Windmills generate electricity by transferring energy from wind to a turbine

Answers

The complete question is reported in the attached picture.

1) The regression analysis was performed by the computer, in the output we have the coefficients we need: 0.137 and 0.240.
Therefore the equation of the least squares regression line will be:
[tex]\hat{y} = 0.137 + 0.240x[/tex]

where:
[tex]\hat{y}[/tex] = estimate of electricity production [A]
x = wind speed [mph]

2) Let's apply the previous formula to our cases:
x = 25 --> [tex]\hat{y}[/tex] = 0.137 + 0.240(25) = 6.137 A
x = 15 --> [tex]\hat{y}[/tex] = 0.137 + 0.240(15) = 3.737 A

The difference is 6.137 - 3.737 = 2.4 A

The windmill would be expected to produce 2.4 A more when the wind speeds at 25mph with respect to when the wind speeds at 15 mph.

3) The proportion of variation in electricity production explained by the linear relationship with the wind speed is given by the R-Sq value, which is 0.873.

Hence, the linear relationship between electricity production and wind speed explains the 87.3% of the variation in production.

4) The text says that the assumptions were checked. The computer performed all the calculations, finding as t-score for wind speed:
T = Coef / SE Coef = 0.240 / 0.019 = 12.63
which was converted to a p-value:
P = 0.000

Therefore, being p <0.05, the null hypothesis can be rejected and we can say that electricity production by the windmill is related to wind velocity.

One light-hour is the distance light travels in one hour. the speed of light is about 300,000 km/s (3 × 10^5km/s). if jupiter is 0.72 light hours from the sun, how far is this?

Answers

Answer:

Jupiter is [tex]7.776*10^8km[/tex] away from the sun.

Explanation:

The speed of light is [tex]3*10^5km/s[/tex]. This means, since there are 3600 seconds in an hour, the distance light travels in 1 hour is:

[tex]3*10^5*3600= 1.08*10^9km[/tex]

and this distance is called the light-hour.

Since Jupiter is 0.72 light-hours away from the Sun, its distance in km from the sun is:

[tex]1.08*10^8*0.72=7.7776*10^8km[/tex]

Thus, Jupiter is [tex]7.776*10^8km[/tex] away from the sun.

Noah modeled a layer of the sun by showing how particles of rice move up and down in boiling water. Which layer of the sun did Noah model? Convective zone Inner core Photosphere Radiative zone

Answers

The layer would be the CONVECTIVE ZONE. The convective zone is named as such because of that is the layer where convection occurs. Convection is the type of heat transfer where heat goes up and circles back down to be heated as seen with a pot of boiling water with rice.

The rice heats up, along with the water and it goes up. When it touches the cold air, it cools down and travels back down, which will be heated again.

Answer:

The answer is A. Convection Zone

Hope This Helps!

what do waves transmit?

Answers

Waves transmit energy

Answer:

Waves only transport a portion of energy.

Explanation:

Let's think about some examples related to waves in nature:

An electromagnetic wave is a combination of electric and magnetic fields, both of them oscillate through space and time. That oscillation transport energy, that is bounded in little "packets" of energy called photons. So this wave transmits energy.In the case of a solid, the periodic oscillation of the molecules, this kind of oscillation transport energy too and in this particular case it is called phonons. It is just a quantum of energy related to a compression wave, as a sound or a vibration lattice in a crystal.

In conclusion, waves only transport a portion of energy.

I hope it helps you!

the image shows an electromagnet made with a 1.5-volt battery how would the magnetic field be affected if you replaced its 1.5-volt battery (on the left) with a 9-volt battery (shown on the right) while using the same nail and coil?

A. The magnetic field strength would increase
B. The magnetic field would not be affected by this change
C. The magnetic field strength would decrease
D. The magnetic field would change direction more frequently

Answers

A.
____________________

The magnetic field strength is directly proportional to the current through the circuit. When the voltage is increased, current also increases, results in a rise in magnetic field strength. Thus, option A is correct.

What is magnetic field?

A magnetic field is the field produced by the magnetic flux or field lines with a magnitude and direction. A magnetic field is always associated with an electric field where, the magnitudes of both field are in direct proportion.

The magnetic field lines will be perpendicular to the electric flux. According to Ohm's law, voltage and current through a circuit are directly proportional to each other.

As the voltage in a circuit is increased, the current through it increases which n turn result in a hike in magnetic field strength. Therefore, when 1.5 volt is changed by 9 volt battery in the circuit, magnetic field strength would increase.

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Which of these is true for the two poles of a magnet?
Question 1 options:

Like poles repel each other.

Unlike poles attract each other.

Like poles attract each other.Unlike poles attract each other.

Like poles attract each other.Unlike poles repel each other.

Like poles repel each other. Unlike poles repel each other.

Question 2 (1 point)
If you rubbed two balloons with a wool cloth and held them close together, what do you think would happen?
Question 2 options:

They would repel one another because they would have positive charges.

They would repel one another because they would both have a negative charge.

They would attract one another because they would both have a negative charge.

They would attract one another because they would have opposite charges.

Question 3 (1 point)
An object has

Answers

1. is A and B
Not sure about the other one

Question 1:

Answer:

Like poles repel each other. Unlike poles attract each other.

Explanation:

In a magnet their are two poles which are north pole and south pole. Like pole repel each other and unlike pole attracts each other because magnetic lines of force originate from north pole and terminate on the south pole.

Question 2:

Answer:

They would repel one another because they would both have a negative charge.

Explanation:

When balloon is rubbed with wool cloth electrons are transferred from wool to balloon. Thus, balloon acquire negative charge and wool becomes positively charged. Since, we are rubbing both balloons the charges on the surface are same. Hence they would repel one another because they would both have a negative charge.

Question 3:

This question is incompletely posted.

Dwarf galaxies are generally only about one-fifth the size of the andromeda galaxy. true or false

Answers

Answer

Its False

Explanation

Dwarf galaxy is a small galaxy which consist of about several billion stars,

The Andromeda galaxy is a spiral galaxy is the closest big galaxy to our Milky Way. We can see the Andromeda galaxy from earth.

But it is not proved that Dwarf galaxies are only about one-fifth the size of the andromeda galaxy.

One hypothesis states that plate movement results from convection currents in the a. inner core. c. lithosphere. b. asthenosphere. d. outer core.

Answers

One hypothesis states that plate movement results from convection currents in the asthenosphere.

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1. What is the period of a wave with a wave speed of 12 m/s and a frequency of 60 Hz?

A. 5.0 s

B. 720 s

C. 0.20 s

D. 0.02 s

Answers

Period = 1/Frequency = 1/60
12 * 1/60 = 1/5 m

So your answer would be C. As 1/5 is .20 seconds.

Answer: 0.02s

Explanation:

Which of the following are disadvantages of solar energy?

Answers

Final answer:

The disadvantages of solar energy primarily include its dependency on weather, need for large space, requirement of rare-earth minerals for photovoltaic cells, and potentially high costs.

Explanation:

The main disadvantages of solar energy are largely tied to its dependence on weather conditions and the requirement of considerable space. Solar energy generation is chiefly affected by cloud cover, nightfall, and incident angle strike at high altitudes that influence the amount of light energy available. While solar energy conversion does not necessarily require connection to large-scale power grids, making it beneficial for remote locations, it does rely on the creation of photovoltaic cells which require rare-earth minerals that can be difficult to obtain. Additionally, the price of solar energy, despite falling dramatically, may still present as a financial barrier for some.

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What type of radiation can penetrate deepest into exposed materials?

Answers

Gamma radiation has the greatest penetrating power. Gamma Radiation can only be absorbed by a thick lead plate. Gamma will pass through 6 feet for steel-lined concrete and can give a lethal dose in as little as 20 minutes. Gamma rays are the most penetrating, being able to travel through a few meters of lead.

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