Why are graphs useful when interpreting data

Answer:

an example of an exthermic process is combustion

Explanation:

combustion is like lighting a candle

Answer:B

Explanation:

Initial velocity, u=0m/s

Distance,s=20m

a=+g=9.8m/s*s

Using v*v=u*u+2gs

v*v=0+2*9.8*20

v*v=392

v=19.8

When s=20m, v = 19.8m/s

Therefore when v = 10m/s, s= 10*20/19.8

s =10.1m

Answer:

I believe that its D. 15 Meters

Explanation:

Answer:

The amount of Potential Energy lost in the form of Thermal Energy is equal to 41.64 MJ.

Explanation:

mass of the cart and passengers = m = 3.5*10⁴ kg

Height = h = 126.5 m

g = 9.8 ms⁻²

v = 10 ms⁻¹

At the top position the Total energy of the ride is in the form of potential energy given as:

P.E = mgh

= 3.5*10⁴*9.8*126.5

= 43389500 J

At the bottom of the drop, all the Potential Energy will be converted into K.E as the ride develops speed given as:

K.E = 0.5*m*v²

= 0.5*3.5 x 10⁴*100

= 1750000 J

The K.E is much less than the P.E energy even though all the P.E of the ride has been converted. The loss of energy is due to the formation of thermal energy which can be calculated as:

Thermal Energy lost = Total energy in the form of P.E(top) - Total energy in the form of K.E(bottom)

= 43389500 -  1750000

= 41639500 J

= 41.64 M J approx             M J = mega joule = 10⁶ J

Answer:

-0.045 N, they will attract each other

Explanation:

The strength of the electrostatic force exerted on a charge is given by

[tex]F=qE[/tex]

where

q is the magnitude of the charge

E is the electric field magnitude

In this problem,

[tex]q=3.0\cdot 10^{-6}C[/tex]

[tex]E=-1.5\cdot 10^4 N/C[/tex] (negative because inward)

So the strength of the electrostatic force is

[tex]F=(-3.0\cdot 10^{-6}C)(1.5\cdot 10^4 N/C)=-0.045 N[/tex]

Moreover, the charge will be attracted towards the source of the electric field. In fact, the text says that the electric field points inward: this means that the source charge is negative, so the other charge (which is positive) is attracted towards it.

Answer:

The correct answer is actually -0.045; attract each other

Explanation:

Answer: gears and brakes cause friction

The two engineering appliances which uses friction​ include

Gears experience friction despite it being lubricated as that only reduces the

wear and tear effect. Friction in gear takes place at the interface of

lubricated tooth parts which undergo rolling and sliding movements.

Brakes also experience friction when applied in which the brake pads touch

the brake discs thereby creating friction. The heat generated from the

friction helps to resists and slow down the the motion of the wheels of the

car.

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Answer:

The answer of tan(61) is:

A= 1.80

Answer:

True.

Explanation:

Answer:

It can exert a greater force through a greater distance than the force used on the machine.

Explanation:

A machine is a device that makes work easier and so it should exert greater force than the force applied on it.

Answer:

she is correct

Answer:

They must be cooler than the air inside the house.

Explanation:

The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. It is true to say that the coils are cooler than the air inside the house when they are accepting the heat inside the house. Heat will always flow from hot to cold substances

The aluminum coils in an air conditioner act as evaporator coils when accepting heat inside the house, absorbing thermal energy and transferring it outside after the refrigerant is compressed and condenses to a liquid.

When the aluminum coils in an air conditioner are accepting heat inside the house, they are acting as evaporator coils. During this phase, the coils absorb thermal energy from the indoor air. The electrically driven compressor works to raise the temperature and pressure of the refrigerant, causing it to transfer thermal energy and condense into a liquid. This liquid then moves to the outside of the house, where it passes through a pressure-reducing valve into the outdoor evaporator coils. Here, it expands and cools down, releasing the absorbed heat to the outside environment. This process is dictated by the principles of thermodynamics and is a practical application in cooling a home. Air conditioners and refrigerators work based on the same concept, where their efficiency is measured by the amount of heat transfer per work input, often expressed through the coefficient of performance (COP).

Answer:

d. causes the cell to make more viruses

Explanation:

Viruses depend on the host cells that they infect to reproduce. When found outside of host cells, viruses exist as a protein coat or capsid, sometimes enclosed within a membrane. The capsid encloses either DNA or RNA which codes for the virus elements.

Answer:

Another term for planned economy is a socialist system.

The correct answer would be, Socialist system.

Socialist system is another term for a planned economy.

Explanation:

An economic system, in which the economy(including investment, capital and allocation of capital goods) is governed by a predefined economic and production plans, is called as the Planned Economy.

The system of planning in this economic system can either be centralized, decentralized or participatory.

This economic system is regulated by the Government. All decisions about the capital, lands, buildings, machinery, or other resources are taken by the government.

The production, prices, distribution, etc of the products or services are regulated centrally by the government.

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Answer:

Medulla

Explanation:

Medulla is the part of your brain that controls basic life support function.

The  part of your brain that controls basic life support function is the medulla. The medulla sees to the transmission of information from the spinal cord to important parts of the brain.

The brain is the organ that controls every other organ in the body. It controls the nervous and the endocrine systems.

The  part of your brain that controls basic life support function is the medulla.

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Answer:

Covalent.

Explanation:

In carbon tetrachloride, chlorine and carbon are bounded with each other by single covalent bond. Carbon atom contains eight electrons in outer shell and chlorine atom also have eight electrons, so they are completing their octet by the sharing of electrons with each other.

Covalent bond is forming by the overlap of orbital, in CCl4 overlap is occurred so it is a covalent bounded compound. Formation of Ionic compounds occurs when two opposite charged ions interact with each other by electrostatic interaction such as NaCl, Na having positive and Cl having negative charge.

So, the answer is covalent bond.

Carbon tetrachloride (CCl₄) is a covalent compound. This means that the carbon and chlorine atoms are bonded together by sharing electrons.

Carbon tetrachloride is a nonpolar molecule, which means that the electrons are evenly distributed around the molecule. This is because the chlorine atoms are all equally electronegative, so they do not attract the electrons more strongly than the carbon atom.

Ionic compounds, on the other hand, are formed when there is a transfer of electrons from one atom to another. This occurs when one atom has a much higher electronegativity than the other atom.

The covalent bonding in carbon tetrachloride makes it a nonpolar molecule. This means that it does not have a permanent electric dipole moment, and it is not attracted to other polar molecules.

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Answer:

A and B

Explanation:

Because both of them have only magnitude not direction.

Answer:

I think it's either A or B. but i'm going to say B.

Explanation:

Hope my answer has helped you if not i'm sorry.

Answer:

Zero (0)

Explanation:

A horizontal line will be no movement of negative of positive acceleration

Answer:

Zero acceleration

Explanation:

In a velocity-time graph, the gradient of the line describes how the acceleration varies.When the gradient is positive, it means we have a line that is upward sloping thus the accelaration is positive.When we have a negative gradient, it means the line is downward sloping thus the accelaration is negative.When the gradient is zero, there is no slope, thus the accelaration is zero, the case of a horizontal line.

Answer:

10. B. 30 kg.m/s

16. B. Elastic collision

20. Velocity

Explanation:

10. Momentum is simply the product of mass and velocity of an object. So it can be soved with the equation:

p = mv

Where:

p = momentum (kg.m/s)

m = mass (kg)

v = velocity (m/s)

Your problem gives you the following:

m = 15 kg

v = 2 m/s

p =?

So just fill in what you know:

p = mv

p = (15kg)(2m/s) = 30 kg.m/s

16. Elastic collision occurs when two objects collide and no loss in energy occurs after collision. Supposing that the balls are very bouncy, let's say they bumped into each other and they bounce-off of each other. If there is no loss in speed on both ends, that means that this is an elastic collision.

20. To differentiate vector and scalar quantity, just remember that vectors have direction. Both quanitites show magnitude, but vector quantities indicate the direction the magnitude is going. Among all the choices, it is only velocity that is considered as a VECTOR quantity.

Answer:

There is NO DATA??

Explanation:

Answer:copper

Explanation:

Answer:

All these laws give the relationship between two quantities of the gas among V (volume), p (pressure) and T (temperature), keeping the third one constant - however the two quantities change for each law

Explanation:

Calling:

p = gas pressure

V = gas volume

T = gas temperature (in Kelvin)

We have:

- Boyle's law: the pressure and the volume of a gas kept at constant temperature are inversely proportional. Mathematically,

[tex]pV=const.[/tex]

- Charles's law: the temperature and the volume of a gas kept at constant pressure are directly proportional. Mathematically,

[tex]\frac{V}{T}=const.[/tex]

- Gay Lussac's law: the temperature and the pressure of a gas kept at constant volume are directly proportional. Mathematically,

[tex]\frac{p}{T}=const.[/tex]

(a) 30.9 m

Let's analyze the motion of the parachutist. Its vertical position above the ground is given by

[tex]y=h+ut+\frac{1}{2}gt^2[/tex]

where

h = 45 m is the initial height

u = 10 m/s is the initial velocity (upward)

t is the time

g = -9.8 m/s^2 is the acceleration of gravity (downward)

Substituting t=3 s , we find the height of the parachutist when it opens the parachute:

[tex]y=45 m+(10 m/s)(3 s)+\frac{1}{2}(-9.8 m/s^2)(3 s)^2=30.9 m[/tex]

(b) 44.1 m

Here we have to find first the height of the balloon 3 seconds after the parachutist has jumped off from it. The vertical position of the balloon is given by

y = h + ut

where

h = 45 m is the initial height

u = 10 m/s is the initial velocity (upward)

t is the time

Substituting t = 3 s, we find

y = 45 m + (10 m/s)(3 s) = 75 m

So the distance between the balloon and the parachutist after 3 s is

d = 75 m - 30.9 m = 44.1 m

(c) 8.2 m/s downward

The velocity of the parachutist at the moment he opens the parachute is:

v = u +gt

where

u = 10 m/s is the initial velocity (upward)

t is the time

g = -9.8 m/s^2 is the acceleration of gravity (downward)

Substituting t = 3 s,

v = 10 m/s + (-9.8 m/s^2)(3 s)= -19.4 m/s

where the negative sign means it is downward

After t=3 s, the parachutist open the parachute and it starts moving with a deceleration of

a =+5 m/s^2

where we put a positive sign since this time the acceleration is upward.

The total distance he still has to cover till the ground is

d = 30.9 m

So we can find the final velocity by using

[tex]v^2-u^2 = 2ad[/tex]

where this time we have u = 19.4 m/s as initial velocity. Taking the downward direction as positive, the deceleration must be considered as negative:

a = -5 m/s^2

Solving for v,

[tex]v=\sqrt{u^2 +2ad}=\sqrt{(19.4 m/s)^2+2(-5 m/s^2)(30.9 m)}=8.2 m/s[/tex]

(d) 5.24 s

We can find the duration of the second part of the motion of the parachutist (after he has opened the parachute) by using

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

where

a = -5 m/s^2 is the deceleration

v = 8.2 m/s is the final velocity

u = 19.4 m/s is the initial velocity

t is the time

Solving for t, we find

[tex]t=\frac{v-u}{a}=\frac{8.2 m/s-19.4 m/s}{-5 m/s^2}=2.24 s[/tex]

And added to the 3 seconds between the instant of the jump and the moment he opens the parachute, the total time is

t = 3 s + 2.24 s = 5.24 s

Answer:

This is the electromagnetic spectrum.

Explanation:

The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies. Hope this helps have a great day!

Answer:

B. EMR (Electromagnetic Radiation)

Explanation:

The Electromagnetic Radiation Spectrum consists of photons of all energies. It contains a series of high energy gamma rays to low energy microwaves. The spectrum contains waves in increasing order of the their frequency and decreasing wavelength. In vacuum, all the EMR travel with speed of light c.

Acceleration = (change in speed) / (time for the change)

Change in speed = 25 m/s

Time for the change = 30 sec

Acceleration = (25 m/s) / (30 sec)

Acceleration = (25/30) (m/s /s)

Acceleration = 0.833... m/s²

Answer:

Quantum theory is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the atomic and subatomic level. The nature and behavior of matter and energy at that level is sometimes referred to as quantum physics and quantum mechanics.

Explanation:

Don't know if this helped at all but I got it from this website:  

https://whatis.techtarget.com/definition/quantum-theory

Answer:

Matter in quantum mechanics is particles and waves.

Final answer:

To calculate the total force required for lifting a box vertically, consider the weight of the box and the force applied by the person. Add these two forces together, making sure the directions are opposite.

Explanation:

In order to calculate the total force required for lifting a box vertically, you need to consider two main forces:

The total force required can be calculated by adding the weight of the box and the force applied by the person. It is important to note that the direction of the force applied by the person should be opposite to the direction of the weight of the box.

-- Electric field lines DO never cross.  (A)

-- Electric field lines that are close together DO indicate a stronger electric field. (B)

-- Electric field lines DO not affect the charge that created them.  (C)

-- Electric field lines DON'T begin on north poles and end on south poles.  North and South "poles" are the way we talk about magnets, not electric charges.

Explanation:

The imaginary lines that shows the direction of electric field are called electric field lines. The direction of electric field lines are from positive charge to the negative charge.

Two electric field lines can never ever intersect, if they do so there would be two direction of electric field at that point, which is not possible.

If the electric field lines are very to each other, then it indicates the stronger electric field. The electric field lines is unaffected by the nature of charged particle that created them.

Hence, the correct options are :

(A) They never cross

(B) Field lines that are close together indicate a stronger electric field

(C) They don't affect the charge that created them.

Answer:

Its True

Explanation:

The difference between a red shift and a blue shift is as follows;

Red shift: In the red shift, light changes as the object in space (such as star or galaxies) moves away from us then the light is shifted to red end.The light is shifted to a shorter frequency. In this case, the light is shifted to a longer wavelength.

Answer:

true

Explanation:

Answer:

constructive interference

Explanation:

waves come together so that they are in phase with each other

Answer:

condensation or distillation

Explanation:

Answer: condensation

Explanation:

Answer:

[tex]43.2^{\circ}C[/tex]

Explanation:

The change in temperature of the sample of alcohol is given by:

[tex]\Delta T=\frac{Q}{mC_s}[/tex]

where

Q = 890 J is the amount of heat provided to the sample

m = 16.6 g is the mass of the sample

[tex]C_s = 2.47 J/gC[/tex] is the specific heat of alcohol

Solving the equation,

[tex]\Delta T = \frac{890 J}{(16.6 g)(2.47 J/gC)}=21.7^{\circ}C[/tex]

And since the initial temperature was

[tex]T_i = 21.5^{\circ}C[/tex]

the final temperature is

[tex]T_f = T_i + \Delta T=21.5^{\circ}C + 21.7^{\circ}C=43.2^{\circ}C[/tex]

Answer:

An idea, event, or object can be represented by a 'model' to help people better understand it.

Explanation:

If an idea, event or object is to be represented or introduced to an individual or a group of people, a good idea is to represent it with a model.

The reason behind it being that a model will help the people understand it better as they will be able to see something in front of it and know what is being discussed.

A symbol is used to represent an idea, event, or object, to convey complex ideas and emotions with cultural significance. Symbolism allows for effective communication by providing a shorthand that encapsulates a variety of meanings within recognizable forms.

An idea, event, or object can be represented by a symbol to help people better understand it. Symbolism is the practice of using symbols such as gestures, signs, objects, signals, and words to convey complex ideas and emotions that are recognized shared meanings within a society. For example, the United States' flag might be just a piece of colored cloth, but it can represent a multitude of ideas from freedom and sacrifice to oppression, depending on one's perspective and cultural context.

Creating symbols can be a form of shorthand communication, offering a powerful way to express complex ideas without lengthy explanations. When writing, one might use imagery to evoke a sensory experience of an event or moment, thereby enriching the storytelling with deeper meaning. Symbols thus serve as cultural aggregates which crystallize a variety of emotions and concepts in a universally understandable way.

In some cases, models can serve as symbolic representations, such as equations, physical representations, or computer simulations which abstractly represent aspects of reality to convey understanding to others. Similarly, an analogy can be employed to make complex subjects more relatable by comparing them to familiar experiences or objects, ensuring effective communication with the audience.

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