Which are the main regions of the periodic table? A. metals, nonmetals, gases B. solids, liquids, gases C. metals, semimetals, nonmetals

Hello There!

A force is simply just a pull or a push on an object. It’s measured in Newtons “N”

Matter is anything that has mass and it takes up space. This is also known as volume

Explanation:

FORCE:

force is any interaction that, when unopposed, will change the motion of an object.

MATTER:

anything which have mass and occupies space in air is known as Matter

Answer:

whats the question

Explanation:

Answer:

a

Explanation:

3000 m / 4 minutes = 720 ave speed per minute

720 / 60 seconds = 12.5 m/s

Answer:

The reading of Y is -10°.

Explanation:

For scale X, the ice point is 40° and steam point is 120°.

Difference between the two extremes for scales X = 120 - 40 = 80

For scale X, the ice point and steam points are -30° and 130° respectively.

Difference between the two extremes for scales X = 130 - (-30) = 160

Comparing both scales:

One unit of scale X = x

One unit of scale Y = y

Scale X has 80 divisions while scale Y has 160

80x = 160y

x = 2y

50° in scale X = 10x + ice point in X scale

10 divisions in Y scale = 20y

Reading of Y scale = ice point of Y + 20y

= -30° + 20°

= -10°

Answer:

mass

Explanation:

The heaviness of an object with the relation to force of gravity, is described by the ‘weight’

Explanation:

The heaviness of the object is referred to the mass of the object. When the mass of the object is concerned it is taken in space or vacuum where force of gravity do not exist.

Therefore, to value the actual heaviness of the object, mass is multiplied by the component of force of gravity, is termed as weight.  

[tex] \bold{\text { Weight }=\text { Mass } \times \text { Accleration due to gravity }} [/tex]

Answer:

Maritime tropical

Explanation:

The maritime tropical air mass typically produce warm, humid weather in the summer.

Answer:

The correct answer is the maritime tropical air masses.

Explanation:

These air masses are loaded with moisture with the water on which they are produced and heated as well. These air masses are form over the ocean in the hot areas of the Gulf of Mexico and the tropics.

Later they move towards the north, which brings an increase of humidity and hot winds to the United States. This phenomenon generates an increase in the probability of rains and generally occurs in the summer season in the southern states of the country. But nevertheless they can be formed throughout the year.

Answer:

The answer is c).

Explanation:

[tex]v_0 = 2 \frac{m}{s} \\ v_1 = 10 \frac{m}{s} \\ t = 10s \\ \\ s = unknown \\ \\ a = \frac{v_1 - v_0}{t} \\ a = \frac{10 \frac{m}{s} - 2 \frac{m}{s} }{10s} = 0.8 \frac{m}{ {s}^{2} } \\ \\ s = v_0t + \frac{a {t}^{2} }{2} \\ s = 2 \frac{m}{s} \times 10s + \frac{0.8 \frac{m}{ {s}^{2} } \times {(10s)}^{2} }{2} = 60m[/tex]

Answer:

C. Add all the force vectors

Explanation:

The net force acting on an object is the vector sum of all the  forces on the object.

Remember, Newton's first law tells us a body at rest will remain at rest or that in uniform motion will continue in motion unless acted by unbalanced forces.These unbalanced forces act in all direction towards the body thus to get the net force you require a summation of all these force with respect to their magnitudes and directions.

For example a force of 3N towards the East direction acting on a body and another force of 2N towards the West direction on the same body will generate a net force of 1N towards the East direction.

Final answer:

To find the net force acting on an object, one must add all the force vectors using both the x- and y-components to generate an accurate answer.

Explanation:

To find the net force acting on an object, one must add all the force vectors acting on the object (option c). This is known as the vector sum of all the forces or the net force in the x-direction or y-direction, depending on the orientation of the forces. When forces are at an angle, it's important not to forget about the x-components. Creating a free body diagram can help visualize and calculate the forces.

It’s essential to break down angled forces into their x- and y-components and then combine these components from all forces to generate an accurate answer for the net force.

For example, consider the free-body diagram of a shopping trolley. To find the resultant, or net force, one would draw all forces acting on the trolley, including its weight, normal force, friction, and any applied forces.

Then, after dividing any angled forces into their horizontal and vertical components, all forces in each direction are summed to find the net force in each direction, and from these, the overall net force on the trolley.

It's also important to understand that the net force is related to an object's acceleration, as per Newton's second law of motion, Fnet = ma, where Fnet is the net force, m is the mass of the object, and a is the acceleration.

Answer:

You could become injured.

Explanation:

It is important to warm up your muscles before a workout because if you didn't you could pull a muscle or become seriously injured.

Answer:

To decrease your chance of injury

Explanation:

Answer:

The answer is rubidium exhibits +1 and -1 oxidation states.

Explanation:

Rubidium is a reactive element and belongs to the group 1 of the periodic table. It is an alkali metal and it is a highly reactive element.

Rubidium is a very soft and white lustrous element. Rubidium has +1 and -1 oxidation states. When rubidium is burnt, it forms oxides, superoxides and peroxides respectively.

For example, in rubidium oxide (Rb2O), Rubidium has a +1 oxidation state. While in peroxides rubidium exhibits -1 oxidation state. For example Rubidium peroxides (Rb2O2).

Answer:

transmit energy

Explanation:

Waves (both mechanical and electromagnetic) are periodic perturbations of the space that transmit energy without transmitting matter. (so, "transmit energy" is valid for both types of waves).

The other statements are wrong because:

have compressions and rarefactions --> this is a property only of longitudinal waves, while electromagnetic waves are transverse, so they do not have compressions

oscillate in the same direction as the wave motion --> this is the description of longitudinal waves, while electromagnetic waves are transverse,

require a medium for transfer --> this is true only for mechanical waves: electromagnetic waves in fact do not need a medium to propagate.

Answer:

Both mechanical and electromagnetic waves transmit energy .

I hope this really helps!!!

Final answer:

Entropy can only be decreased in a system if energy transfer occurs. When energy is transferred into a system, it can decrease the entropy of that system.

Explanation:

Entropy can only be decreased in a system if energy transfer occurs. When energy is transferred into a system, it can decrease the entropy of that system. For example, if you gather marbles scattered around a room and put them into a cup, you are decreasing the entropy of that system through your work. Similarly, energy from the Sun can decrease the entropy of local systems on Earth. However, it is important to note that the overall entropy of the rest of the universe increases, to satisfy the second law of thermodynamics.

Answer:

it wont fly away

Explanation:

depending how tight the knott and find it is going to be stuck to the pole

A balloon sticks to a sweater due to static electricity, and hair stands up when brought near a charged balloon. A helium balloon moves with the wind, so a flag will not wave unless there's a change in motion. Hot air balloons rise because of a buoyant force, and releasing a filled balloon demonstrates Newton's third law of motion.

The phenomenon of a balloon sticking to a sweater after being rubbed against it is explained by static electricity. When the balloon is rubbed against the sweater, electrons are transferred from the sweater to the balloon, giving the balloon a negative charge and the sweater a positive charge. Due to the attraction between opposite charges, the balloon sticks to the sweater. Bringing the charged balloon close to your hair, which has a neutral charge, will result in your hair standing up due to the attractive force exerted by the balloon's excess electrons.

When you bring a candle close to a balloon, the heat may cause it to pop, resulting in a loud bang. If you are a passenger in the open basket hanging under a helium balloon, and the balloon is being carried along by the wind at a constant velocity, a flag held in your hand will not wave because you, the flag, and the balloon are all moving at the same velocity relative to the wind. However, if there is a gust of wind or an acceleration of the balloon, the flag might wave in the opposite direction of the wind or acceleration.

Hot air balloons rise because the hot air inside is less dense than the surrounding cooler air, creating a buoyant force. This principle is also used in the take-home experiment involving a balloon filled with air or water. When released, the balloon propels in the opposite direction of the expelled air or water, demonstrating Newton's third law of motion: for every action, there is an equal and opposite reaction.

Answer:

Velocity would be your answer.

Answer:

The correct answer will be option-B.

Explanation:

A scientific method is a systematic approach to understand and explain any natural phenomenon of nature.

The method involves various steps which begin with making an observation followed by asking a question which could have real answers and could be tested through scientific experiments. Based on the question background research is done and a hypothesis is proposed to which could be proved or disproved through the experiments.

Thus, Option-B is the correct answer.

Answer:

If iron, nickle, or cobalt is an answer choice, those are the three metals that are purely magnetic.

Answer:

Answer: C. Machines replace workers and eliminate human effort from the production process.

This is sad but true. By replacing the human workers, product cost and productivity increases as the machines now a days can perform tasks both faster and more accurately than humans. The productivity will rise also because of the lessening of human error when it comes to production lines.

Explanation:

Please mark brainliest and have a great day!

The correct option is: C. Machines replace workers and eliminate human effort from the production process.

Option C suggests that technology can improve productivity by replacing human effort with machines, specifically through automation. This process can lead to increased efficiency, reduced production time, and cost-effectiveness. Machines can handle repetitive tasks at a faster rate and with precision, potentially enhancing overall output. However, it's important to note that this can also result in job displacement for certain roles. While automation can streamline processes and reduce manual labor, its implementation requires careful consideration of its societal and economic implications. Therefore, the effectiveness of technology in improving productivity depends on how it is integrated and managed within the broader context of the workforce and industry.

Complete Question:

Which of the following is one way that technology can improve productivity?

A. Powerful machines are less dangerous to industrial workers.

B. Better methods of production allow workers to earn higher wages.

C. Machines replace workers and eliminate human effort from the production process.

D. The assembly line enables more workers to participate in the production process.

Most be equal to the energy lost by reaction

The energy gained by the surroundings must be greater than the energy lost by the reactants in an exothermic reaction.

Explanation:

Exothermic reaction is a chemical reaction in which the energy from the reaction is transferred to the surroundings and so the products and the reactants in the reaction have lesser energy compared to the energy gained by the surroundings.

For example, thermal decomposition of compounds in carbonates. So it must be greater than the energy that is lost by the reactants in an exothermic reaction.

Answer:

Pros and Cons of Analog Signals: Advantages: major advantages of the analog signal is infinite amount of data. Density is much higher. easy processing. Disadvantages: Unwanted noise in recording. If we transmit data at long distance then unwanted disturbance is there.

Explanation:

Answer:

Pros and Cons of Analog Signals: Advantages: major advantages of the analog signal is infinite amount of data. Density is much higher. easy processing. Disadvantages: Unwanted noise in recording. If we transmit data at long distance then unwanted disturbance is there.

Explanation:

A fan never 'cools' a room.  It has no way to change the temperature of anything.

A fan does nothing but MOVE air, and air that's MOVing FEELS cooler on human skin than air that's NOT moving, even at the same temperature.  Non-living objects, and most animals, don't feel any difference on account of a fan.

It doesn't matter whether the room is open or closed.  If the air in the room is moving, then a PERSON in the room will FEEL cooler than if the air is not moving.

Answer:

no the room does not change temperature

The Mariana Trench is the deepest ocean trench, located at a convergent plate boundary in the abyssal zone with depths reaching about 11,000 meters. High pressure, low nutrient content, and lack of light characterize this zone, where chemosynthetic bacteria at hydrothermal vents form the base of the food chain.

The Mariana Trench is known as the deepest ocean trench, residing at a depth that places it within the abyssal zone. This trench is located at a convergent plate boundary, a region where oceanic plates meet and one is forced beneath the other, creating a subduction zone. The Challenger Deep, within the Mariana Trench, reaches about 11,000 m (approximately 6.8 miles) deep. At these depths, there is high pressure and low nutrient content, and no light penetrates to allow photosynthesis. Therefore, organisms such as chemosynthetic bacteria form the base of the food chain, utilizing minerals from hydrothermal vents for energy.

Answer:

systems

Explanation:

they are a bunch of things functioning together

Answer:

D. systems, termed as "organ system".

Explanation:

The organ system is a system that consists of a group of organs that work together to ensure that the organism continues to survive.

Tissues are next in creating the specific organs, and are generally classified depending on the organ it is part of. Note that not all tissues are the same.

Cells are "the smallest", and groups of cells create tissues.

Nerves are part of the Nervous system, which helps provide sensory to the body to help react when the body comes into contact with something that may hurt body parts.

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Answer:

Salt

Explanation:

An acid is a compound that has H as its metal as HCl

A base is a compound that has OH as its nonmetal as in KOH.

A salt has neither, and that's what this is (CuSO4)

Answer:

A box sits stationary  on a ramp

Explanation:

Static friction is a force which keeps an object at rest as it is in the case of the box. It has to be overcome for the object to be set into motion.

Static force of friction is calculated as follows:

F= μη

F is static force of friction.

μ is the coefficient of static friction.

η is the normal force.

Answer:

f=ma

Explanation:

According to second law of motion Force is directly proportional to rate of change of momentum.

so F is directly proportional to [tex]\frac{dp}{dt}[/tex]

we know that momentum P= MV

so

[tex]f=d(mv)/dt=m\frac{dv}{dt}[/tex]

thus we get F=ma.

Answer:

Let F be external force applied on the body in the direction of motion of the body for time interval [tex]\sf \Delta t[/tex], the the velocity of a body of mass m changes from [tex]\sf v [/tex] to [tex]\sf v + \Delta v[/tex] i.e. change in momentum, [tex]\sf \Delta p = m \Delta v [/tex].

According to Newton's second law :

[tex]:\implies \sf F \propto \dfrac{\Delta p}{\Delta t} \\ \\ \\ [/tex]

[tex]:\implies \sf F = k \: \dfrac{\Delta p}{\Delta t} \\ \\ \\ [/tex]

Where k is a constant of proportionality.

If limit [tex]\sf \Delta t \rightarrow 0,[/tex] then the term [tex]\sf \dfrac{\Delta p}{\Delta t}[/tex] becomes the derivative [tex]\sf \dfrac{dp}{dt}[/tex].

Thus,

[tex]:\implies \sf F = k \: \dfrac{dp}{dt} \\ \\ \\ [/tex]

For a body of fixed mass (m), we have :

[tex]:\implies \sf F = k \dfrac{d(mv)}{dt} \\ \\ \\ [/tex]

[tex]:\implies \sf F = km \: \dfrac{dv}{dt} \\ \\ \\ [/tex]

[tex]:\implies \sf F = kma \\ \\ \\ [/tex]

If v is fixed and m is variable then :

[tex]:\implies \sf F = \dfrac{kd(mv)}{dt} \\ \\ \\ [/tex]

[tex]:\implies \sf F = \dfrac{kvdm}{dt} \\ \\ \\ [/tex]

because, k = 1 then :

[tex]:\implies \sf F =\dfrac{vdm}{dt}[/tex]

Now, a unit force may be defined as the force which produces unit acceleration in a body of unit mass :]

So,

F = 1

m = 1

a = 1

k = 1

So,

[tex]:\implies \underline{ \boxed{ \sf F = ma}}[/tex]

Answer:

B) Doppler effect

Explanation:

Scientists use the Doppler effect to determine motion of objects in the universe.

Answer:

B) Doppler effect

Explanation:

Think about the tools scientists use to collect evidence.

Here is proof that my answer is correct:

Added potential energy = (mass) x (gravity) x (height)

or

Added potential energy = (weight) x (added height)

If you need to lift a 15N box 3m straight up, you have to increase its potential energy by (15 N) x (3 m) = 45 Joules .

Where is that added potential energy supposed to come from ?  You could use an electric winch, a steam engine, a gasoline-powered motor, thousands of hamsters running on little treadmills that are are connected to the main pulley somehow, or your own arm muscles.  But howEVER you do it, you have to provide 45 Joules of WORK in order to increase the potential energy of the box by just that much.  

-- the CD player . . . . .  3,924,000 joules

-- the blender . . . . .  36,000 joules

-- the hair dryer . . . . .  270,000 joules

-- the computer . . . . .  7,200,000 joules

The computer is the big loser, mainly because it was left turned on for so long.

Answer:

The computer uses more energy.

Explanation:

We know that the power of an electrical appliance is given by :

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

[tex]E=P\times t[/tex]

E is the energy of the appliance

t is the time taken

For CD player :

Power = 30 watts

Time, t = 3 hours = 10800 s

[tex]E=30\times 10800[/tex]    

E = 324000 Joules

or E = 324 kJ

For blender :

Power = 300 watts

Time, t = 2 hours = 120 s

[tex]E=300\times 120[/tex]    

E = 36000 Joules

or E = 36 kJ

For hair dryer:

Power = 1500 watts

Time, t = 3 minutes = 180 s

[tex]E=1500\times 180[/tex]    

E = 270000 Joules

or E = 270 kJ

For computer:

Power = 200 watts

Time, t = 10 hours= 36000 s

[tex]E=200\times 36000[/tex]    

E = 7200000 Joules

or E = 7200 kJ

So, the computer uses more energy i.e. 7200 kJ. Hence, the correct option is (d).

Answer: Option (A)

Explanation: In the picture given below, we could see two plates colliding one another. The denser oceanic plate is getting subducted beneath the other and there occurs a trench which lies relatively at a lower elevation than the continental crust.

                              The oceanic crust usually is composed of basalt and it does not exert any upward force towards the continental crust.

Answer:

B: 86 N

Explanation:

There are four forces acting on the couch.  Weight pulling down, normal force pushing up, your applied force to the right, and friction opposing you to the left.

In the y-direction:

∑F = ma

N - W = 0

N = W = mg

In the x-direction:

Fnet = P - Fᵣ

Fnet = P - Nμ

Fnet = P - mgμ

Given P = 650 N, m = 71 kg, g = 9.8 m/s², and μ = 0.81:

Fnet = 650 - (71)(9.81)(0.81)

Fnet = 86 N