When a pendulum is held high and taut and then is released, the pendulum begins to swing. What’s the correct order of the energy transformations in this example? (PE stands for potential energy.)

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:

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:

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:

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:

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:

True.

Explanation:

Answer:

Gravitational field

Explanation:

An object of mass M exerts a force (gravitational force) of attraction on any other object of mass m. The magnitude of this force is

[tex]F=G\frac{Mm}{r^2}[/tex]

where G is the gravitational constant and r the separation between the two objects.

Since the object of mass M exerts this force on any other object located around it, we can think as a "gravitational field", which is the region of space around the object of mass M that exerts a gravitational force on other object. This way, the force exerted on another object of mass m can be rewritten as

F = mg

where

[tex]g=\frac{GM}{r^2}[/tex]

is called strength of the gravitational field.

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:

-- 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: 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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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.

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:

condensation or distillation

Explanation:

Answer: condensation

Explanation:

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:

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:

The ability of our bodies to adapt to different levels of gravity. You would become weaker and your heart is use to zero gravity. Boredom because there isn't much to in space. When intelligent people get bored, it's not pretty all the time...

Answer:

an example of an exthermic process is combustion

Explanation:

combustion is like lighting a candle

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:

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]

The answer which lists the fundamental forces in order, from strongest to weakest is:

Fundamental forces are those necessary forces which acts on an object, changing its position

Nuclear force is the force which has to do with the nucleus of atoms

An electromagnetic force is one that has to do with en electrically charged particle.

Gravity is the force which acts on a mass of a body, pulling it downwards.

As a result of this, we can see that the strongest force is the nuclear force, while the weakest is the force of gravity.

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Answer:

✅strong nuclear

A. is correct

Explanation:

Answer:

There is NO DATA??

Explanation:

Answer:copper

Explanation:

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.

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:

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.

Answer:

constructive interference

Explanation:

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

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:

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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(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:

[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]