Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? A. It’s a chemical reaction because a new substance has formed. B. It’s a physical change because the water and the salt kept their original properties. C. It’s an example of synthesis because two substances reacted to give one substance. D. It’s a chemical reaction because the water now tastes salty but originally did not.

Answer:

B) 1:7

Explanation:

the question is asking for the ratio of the first gear to the second gear:

first gear:second gear=8:56

we can simplify this ratio:

8:56=1:7

so the correct option should be B

hope this helps

The gear ratio for the motor gear is 1:7. The correct option is B.

The gear ratio is the ratio of number of teeth on the first gear or driving gear to the second gear or driven gear.

Given is the teeth on driving gear =8 and the teeth on driven gear =56

Gear ratio = 8:56

Gear ratio = 1:7

Thus, the correct option is B.

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I believe that it is C.24 inches

Answer: A. 12inches

Explanation:

One of the characteristics of an object placed in front of a plane mirror is that the object distance(u) is equal to the image distance(v) no matter the position of the object from the mirror.

Since object distance is 30 inches, the image distance will be 30inches as will i.e u = v

Using the relationship to get the height of the image

v/u = h1/h0

Where h1 is image height and h0 is object height.

h0 = 12inches

Substituting the values given in the formula we have

30/30 = h1/12

h1 = 12inches.

This means that the image produce by the object is also 12inches tall.

Answer:

2.5 m/s

Explanation:

The speed of a wave is given by:

[tex]v=f\lambda[/tex]

where

f is the frequency

[tex]\lambda[/tex] is the wavelength

The wave in this problem hits the beach about every 2.0 seconds: this means that its period is 2.0 s. So the frequency is the reciprocal of the period

[tex]f=\frac{1}{2.0 s}=0.5 Hz[/tex]

The crests are 5.0 m away from each other, so the wavelength is

[tex]\lambda=5.0 m[/tex]

Therefore, the speed of the wave is

[tex]v=(0.5 Hz)(5.0 m)=2.5 m/s[/tex]

Answer:

0.96 kWh

Explanation:

First of all, we can find the power of the appliance using the formula:

[tex]P=VI[/tex]

where

V = 120 V is the voltage of the source

I = 2 A is the current

Substituting,

[tex]P(120 V)(2 A)=240 W = 0.24 kW[/tex]

Now we want to find the amount of energy used by the applied in a time of

t = 4 h

The amount of energy is given by

[tex]E=Pt[/tex]

where

P = 0.24 kW

t = 4 g

Substituting,

[tex]E=(0.24 kW)(4 h)=0.96 kWh[/tex]

The appliance uses 0.96 kWh of electrical energy over 4 hours. This is calculated by determining power in kW with the formula P=IV and then multiplying this power by the amount of time in hours.

To find out how many kilowatt-hours of electrical energy an appliance uses, we need to calculate power first. In this case, power is provided by the formula P = IV, where I represents current and V represents voltage.

So, P = 2A * 120V = 240W. But, we typically measure electricity in kilowatts (kW), so this would convert to 0.24 kW.

Next, to find energy consumed over a time period, we use E = Pt, where E represents energy, P represents power, and t represents time. Substituting the values, we find E = 0.24 kW * 4h = 0.96 kWh.

So, the appliance uses 0.96 kilowatt-hours of electrical energy in 4 hours when connected to a 120V source and drawing a current of 2A.

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Pressure in Physics is indeed defined as force per unit area. Typically, this is measured in units such as Pascals, equivalent to one Newton per square meter.

Yes, in Physics, pressure is defined as force per unit area. This is typically measured in units of Pascals (Pa), which is equivalent to one Newton per square meter (N/m^2). For instance, if you apply a force of 10 Newtons over an area of 2 square meters, the resulting pressure would be 5 Pascals (10 N / 2 m² = 5 Pa).

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true, it is very important to give the person talking your full attention. poor eye contact can show lack of interest or signs you aren’t paying attention.

True. When speaking to someone, it’s important to make eye contact to show confidence in what you are saying. It’s also good to make eye contact when someone is talking to to you to make it clear that you are listening. It also makes you look more professional. Hope this helps :)!

Answer:

It will travel through outer space the fastest.

B. Outer Space.

The light will have the fastest velocity when it travels through air or vacuum.

Answer: Option A

Explanation:

Light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water. In air, light waves travel fast because here the refraction phenomenon, light bending cannot be explained by the fact that light travels in different materials at changing speeds. But, it can be clearly seen in the case of glass or water.

Light's velocity (vacuum and air) = 273,400 mph or 300 million m/s.

Light’s velocity (water) = 205,600 mph or 226 million m/s.

Light's velocity (glass) = 182,300 mph or 200 million m/s.

The creation, distribution, and management of natural resources significantly affect the geographic patterns of economic activities, the movement of products, money, and people, and the concentration of industries and labor markets.

The formation and distribution of natural resources are fundamental factors that influence the geographic patterns of human activities, including the movement of products, money, and people. Natural resources such as minerals, water, and fertile land are unevenly distributed across the globe. This variance leads to the concentration of economic activities and populations around areas where these resources are abundant or accessible.

The management of natural resources also plays a crucial role in shaping economies and communities. Effective management can lead to sustained economic growth and attract investments, which in turn affects the flow of products and capital. Conversely, poor management can cause resource depletion, environmental degradation, and economic decline, impacting patterns of trade and migration.

Additionally, the political and technological aspects involved in resource extraction and processing, as well as the development of infrastructure, can further influence how natural resources affect the distribution of industries and the mobility of labor markets. As a result, the creation, distribution, and management of key natural resources are central to understanding the interconnectedness of places and the dynamics of global economic systems

Answer: The correct answer is 75 kg m/s.

Explanation:

The expression of the momentum in terms of velocity and mass is as follows;

p=mv

Here, m is the mass of the object and v is the velocity.

It is given in the problem that a person with a mass of 15 kg is walking on a flat surface at a velocity of 5 m/s.

Calculate the walker's momentum.

Put m= 15 kg and v= 5 m/s in the above expression.

p=(15)(5)

p= 75 kg m/s

Therefore, the momentum of the speedboat is 75 kg m/s.

Answer:

Explanation:

The amount of gas, the volume, and the temperature.

The International System of Units (SI) is used in almost every country in the world (except Burma, Liberia and the United States).

This system was created in 1960 by the 11th General Conference of Weights and Measures in France and is made up of seven basic units:  

-Ampere (electric current)

-Kelvin (temperature)

-Second (time)

-Meter (length)

-Kilogram (mass)

-Candela (luminous intensity)

-Mol (amount of substance) *added to the system in 1971

Plus an unlimited number of derived units from the main ones.

Answer:

the systeme international

Explanation:

Answer:

In the last section, you used magnitude as a substitute for relative distance. But magnitude can also be converted into a direct measure of relative distance.

Explanation:

F is a relative number that compares the arriving radiant flux to a standard: the star Vega in the northern constellation Lyra.

Answer:

C. At a particular instant

Explanation:

Speed is the defined as the ratio between the distance covered by an object and the time taken:

[tex]v=\frac{d}{t}[/tex]

where d is the distance and t the time.

However, there are two possible measurements of speed:

- Average speed: this is the speed measured over a non-zero time interval (for example: a car moving 100 metres in 5 seconds; its average speed is

[tex]v=\frac{100 m}{5 s}=20 m/s[/tex]

- Instantaneous speed: this is the speed of an object measured at a particular instant in time, so for a time interval that tends to zero. So, in the previous example, the average speed is 20 m/s but the instantaneous speed of the car at various instants of time can be different from that value.

Answer:

As an object’s temperature increases, the Rate at which it radiates energy increases.

An increase in temperature of the object’s, increases the RATE that radiates energy.

Explanation:

The difference in the temperature of the object is the main reason for transfer of heat energy from one to the other. The overall average of kinetic energy produced by the particles that exits in a substance is known to be temperature.  

The temperature may be either cold or hot. When there is a rise or increase in an object's temperature, there will be an increase in rate at which it radiates or emits energy.  The molecule in the object moves when it gets heated.

Answer:it’s c

Explanation:

I got it right on the test

Answer:

Explanation:

The resistance column is correct.

I1 = I2 = I3 = I4 = 2 Amps

So all the currents are the same.

R = 110

I = 2 amps

V = ?

Vt = I * R

Vt = 2 * 110

Vt = 220

=============

V1 = 20 * 2 = 40 volts. That's 40 volts dropped from the right side of R1 to the left side.

V2 = 60 * 2 = 120 volts across the 60 ohm resistor

V3 = 30 * 2 = 60

Total voltage = 40 + 120 + 60

Total voltage = 220 which is just what it should be.

==========================

Power

P1 = V1 * I

P1 = 40 * 2

P1 = 80 watts

P2 = 120*2

P2 = 240

P3 = 60 * 2

P3 = 120

Total Power = 80 + 240 + 120

Total Power = 440

Transferring information from a sphere, such as Earth, to a flat surface, such as a map, is known as projection.

Answer: Option A

Explanation:

The art of drawing maps which shows the terrain of Earth is known as cartography. One of the parts of cartography is termed as map projection. The map projection or projection is the process of transferring information from the sphere such as Earth to a flat surface of maps.

As the flat surface should include latitudes and longitude precisely to easy determination of location while navigation, the map projection should be done carefully and accurately.

The projection works on the principle of transferring the positioning of latitudes and longitudes and any changes to the places nearby every longitudes and latitudes.

The Keplers Laws about the motion of planets leds to Newton to discovered the three laws of motion. Newton based on Kepler came to the conclusion that all motion whereas it was follow the same principle.

“Universal Gravitational Law” discovered by Sir Issac Newton followed Kepler’s law.

Explanation:

The acceleration of the moon and objects on the earth are compared by Newton. Gravitational force directly depends on both the object's masses and inversely proportional to square of distance between the center of the objects.

Kepler’s Laws of Motion has been reviewed and Newton developed the proof that elliptical form of planetary orbits resulting the centripetal force which is inversely proportional to square of radius vector.

Answer:

D

Explanation:

Water in itself is a bad conductor of electricity. Any compound that dissociates in water into ions and charged molecules, will increase conductivity of water. In this case ionic compounds weak basis and acids will put in free ions into the water. The ions can pass electricity because they are attracted to respective poles of electricity depending on their charges. In water, these ions are free moving unlike when they are immobilized in their lattice in solid form.

Organic compounds are mainly made of covalent bonds (around carbon) hence do not dissociate in water.

Answer:

the answer is c

Explanation:

i just took it on usatp and its c

Answer:

B and D

Explanation:

Fresh water is essential to all life on Earth. Most of Earth's water is stored in the oceans.

Answers: B. Fresh water is essential to all life on Earth. and D. Most of Earth’s water is stored in the oceans.

Answer: The two devices are motors and generators.

Explanation: An electromagnet is a type of magnet that works when the flow of an electric current activates the magnetic field.

Final answer:

Electric motors and generators both utilize electromagnets to function, with motors converting electrical to mechanical energy, and generators doing the opposite.

Explanation:

Electromagnets are essential to the workings of both electric motors and electric generators. In an electric motor, a current-carrying coil positioned in a magnetic field experiences forces that produce torque, causing the motor to rotate. Conversely, in an electric generator, mechanical work is converted into electric energy by rotating a coil within a magnetic field, which induces electromotive force (EMF) through electromagnetic induction.

Answer: D. KNO3

Explanation:

Answer: d. KNO3

Explanation: i did the usatestprep

Answer:

from the positive end of the battery through the capacitor through the resistors to the negative end...

Current flows from higher potential (+) to lower potential (-)..

Answer:

- from the negative end of the battery through the capacitor through the resistors to the positive end

Explanation:

Here we know that battery is used to apply constant potential difference which will help to provide potential energy to the electric charge.

Now this charge will use this electric potential energy to move through higher potential region to lower potential region

here positive charge will always move from higher potential region to lower potential region while electron will move in opposite sense. So electron will always flow from lower potential point to higher potential point as it is negatively charged

so here the electron will start from negative terminal of battery and then goes to capacitor and then resistors and then finally move to positive terminal of the cell.

Answer:

Sea-floor spreading occurs in the oceanic ridges. In there, volcanic activity, together with the gradual movement of the bottom, form new oceanic crust. This allows a better understanding of the continental drift explained by the theory of plate tectonics.

The greatest evidence for Sea-floor spreading is the oceanic trenches, the oceanic ridges, the magma protruding to the surface and the new seafloor.

In previous theories,  continents were assumed to be transported across the sea. Harry Hess, in the 1960s, proposed the idea that the seabed itself moves  as it expands from a central point. The theory is now accepted, and the phenomenon is thought to be caused by convection currents in the upper layer of the mantle.

Answer:

magnetic reversal

When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. A negative m means that the image is inverted. Positive means an upright image.

When the distance is positive, real image is produced. When the distance is negative, virtual image is produced.

Explanation:

Image distance is the distance between the object to the lens of the mirror. When the image distance is positive, it means that the real image is produced in the mirror. When the image distance is negative, it means that the virtual or diminished image is produced in the mirror.

Answer:

About 1/3 of the weight of the probe on Earth's surface

Explanation:

The weight of the probe is given by

W = mg

where

W is the weigth

m is the mass of the probe

g is the acceleration due to gravity

We notice that:

- m (the mass) is constant, since it depends only on the properties of the probe, so it does not change when the probe moves to Mars

- g' (the acceleration due to gravity on Mars) is 1/3 of g (acceleration due to gravity on Earth)

So, the weight of the probe on Mars surface is

[tex]W' = mg'=m(\frac{1}{3}g)=\frac{1}{3}(mg)=\frac{1}{3}W[/tex]

So, the weight of the probe on Mars surface is 1/3 the weight of the probe on Earth's surface.

Answer:

v = 15.19 m/s

Explanation:

As we know that when object is dropped from some height then initial speed of the object is taken as

[tex]v_i = 0[/tex]

now for the final speed of object we can say that if acceleration is constant then the final speed will be given by kinematics equation

[tex]v_f = v_i + at[/tex]

here we have

[tex]a = 9.8 m/s^2[/tex] (due to gravity)

now from this equation of motion

[tex]v_f = 0 + (9.8)(1.55)[/tex]

[tex]v_f = 15.19 m/s[/tex]

Answer:

-15.2  

Explanation:

the guy above didn't put a negative when talking about gravity which is always -9.80

Answer:

Kinetic energy is energy that to being used or in motion while potential energy is energy being stored which is later turned into Kinetic energy

Explanation:

Scientists define energy as the ability to get work done. The work can be anything from breathing to riding a bike to taking a nap. All energy can be in one of two states: potential or kinetic.

Potential Energy is stored energy that is ready to go. A race car at the starting line of a race, a bicycle on top of a hill, and students waiting to go home from school are all examples of potential energy.

Kinetic Energy is energy at work. A race car speeding around a corner, a bicycle rushing down a hill, and students running home from school are all examples of kinetic energy.

Answer:

a) the objects must be different temperatures

Explanation:

The size of the objects does not matter, and they must be different temperatures.  If the objects were the same temperature, there would be no heat transfer able to occur.

Hope this helps!

In order for heat to transfer from one object to another, the objects must be at different temperatures. (a)

Answer:

a sequence

Explanation: was that an option?, or was it not a multiple choice question ?

In a cyclic process, the internal energy must not change because the system returns to its beginning state. As a result, according to the first rule of thermodynamics, the system's net work and net heat transfer must balance each other out.

A cyclic process is one in which the initial and final states are identical. It is a series of operations that ends with the system in the same condition as when it began. As a result, in a cyclic transition, the system's work is equal to its heat absorption.

A cycle is a collection of actions or activities that occur repeatedly in the same manner.

Expansion at constant temperature, heat removal at constant temperature, compression at constant temperature, and addition of heat at constant temperature are all examples of the cyclic process.

Therefore, cyclic process that returns to its beginning and repeat itself in the same sequence.

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