A ramp is often used to raise an object. If 80 joules of energy are needed to lift an object to a platform but 100 joules are
used in rolling the object up the ramp, what percent of energy was wastec in the form of heat due to friction?

Well let's analyse.

First we know Ohm's law of resistance that states:

[tex]R=\dfrac{U}{I}[/tex]

Where R is resistance, U is voltage and I is current.

If we express current we get:

[tex]I=\dfrac{U}{R}[/tex]

Because resistance cannot be equal to 0 (violation of mathematical law) the only thing that may cause current being zero is voltage.

Which means that as long as your voltage is bigger than 0V then there will be current (if we are talking about AC).

So to answer the question: Electric current is caused by voltage and regulated by resistance.

Hope this helps.

r3t40

Answer: Tesla

Explanation:

Answer:

Tesla

Explanation:

Edge 2021

Answer:

b then c

Explanation:

Answer:

solids have definite shape and volume, liquids have definite volume, but no definite shape, gas has no definite shape or volume. I hope that this is what you was looking for.

Answer:

Solids

Gases

Liquids

Explanation:

Solids have the strongest inter-molecular forces in them, this causes them to have a definite shape and volume.

Gases have the weakest inter-molecular forces in them, this causes them not to have a definite volume or shape. Moreover gases are compressible which means with enough pressure the volume may change for the same number of particles.

Liquids have weaker inter-molecular forces than solids but stronger than gases, this causes them to have a definite volume, but indefinite shape.

Answer:

c. Ptolemy

Explanation:

Ptolemy was the one to believe that other planets and celestial objects orbited around the earth

Hello There!

The answer to your question is C) Ptolemy

Claudius Ptolemy was famous for being a greek astronomer. He was the one who introduced the "Geocentric Theory"

true should be right if it is

True, More light is transmitted through a translucent material than through an opaque material.

Answer: A

Explanation

Depending on the ability to pass the light through the body, materials can be classified into transparent material, translucent material and opaque material.

Transparent materials are those that are able to pass most of the light hitting it. Examples are water, glass etc.

Translucent materials are able to pass some portion of light through them. Example - plastic.

Opaque materials are those in which light will not pass through. Majority of the light is reflected or absorbed. Example- wood.

Answer:

2.67 N/kg

Explanation:

We are given that an object that weighing 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right with 30 N friction to the left.

We are to find the acceleration of the object.

Mass = 75/10 = 7.5 kg

Acceleration = Net Force / mass

Net force = Horizontal force - Frictional force = 50 - 30 = 20

Acceleration of the object = 20 / 7.5 = 2.67 N/kg

Answer:

[tex]2.61m/s^2[/tex]

Explanation:

We first of all find the net force F acting on the object. The frictional force [tex]F_f[/tex] and the pulling force [tex]F_p[/tex] act in opposite directions. Hence the net force is given as follows;

[tex]F=F_p-F_f...............(1)\\Given;\\F_p=50N\\F_f=30N\\Hence;\\F=50-30\\F=20N[/tex]

It is this net force that brings about the acceleration of the body. Recall that

[tex]F=ma..............(2)[/tex]

where m is the mass of the object and a is the acceleration.

The weight W of the object is given, hence we obtain its mass as follows;

[tex]W=mg..............(3)[/tex]

where g is acceleration due to gravity taken as [tex]9.8m/s^2[/tex].

Given;

W = 75N

[tex]75=m*9.8\\m=\frac{75}{9.8}\\m=7.65kg[/tex]

From equation (2), we have

[tex]a=\frac{F}{m}..................(4)[/tex]

Hence;

[tex]a=\frac{20}{7.65}\\a=2.61m/s^2[/tex]

Answer:

The answer is theory. Hope that's the right answer

Answer: theory.

Explanation:

A scientific theory is the detailed explanation for the cause of the natural process, or natural event or natural phenomena. The explanation is based upon detailed experimental trials and direct observation.

The Charles Darwin "On the Origin of Species" is the theory which is considered as the foundation of evolutionary biology.

The true statement about waves is that both transverse and longitudinal waves can travel through water. Transverse waves oscillate perpendicularly to the wave direction, while longitudinal waves oscillate parallel to the wave direction.

The question pertains to the characteristics of different types of waves. A true statement about waves needs to accurately describe the motion of particles relative to the direction of the wave's travel.

Statement B: 'Both transverse and longitudinal waves can travel through water'. This is a true statement. Water waves are actually a combination of transverse and longitudinal waves, where the particles in water move in circular paths.

Transverse waves involve oscillations that are perpendicular to the direction the wave travels. Longitudinal waves, on the other hand, involve oscillations that are parallel to the direction of wave propagation.

Hello There!

The type of bond that is found between the atoms of a molecule is called "COVALENT" bond.

A covalent bond is where two atoms share a pair of electrons.

The bond between the atoms of molecule is Covalent bond.

Answer: Option C

Explanation:

Covalent bond due to its phenomenal activity is also known as molecular bond. The electron pairs are shared between the atoms, these shared electron pairs are known as "shared pairs or bonding pairs".

This type of covalent bonding establishes balance between the atoms against attractive and repulsive forces.  Covalent bonds are more common than ionic bonds.

D. μk = 0.21. The coefficient of kinetic friction μk is 0.21.

The key to solve this problem is using the equation of kinetic friction force Fk = μk*n, where μk is the coefficient of kinetic friction, and N is the normal force n = m*g.

Clear μk from the equation Fk = μk*n:

μk = Fk/n

With Fk = 16.46N, and n = 8kg*9.8m/s²

μk = 16.46N/(8kg*9.8m/s²)

μk = 0.21

Answer: D: .21 on apex :)

Explanation:

Answer:

18

Explanation:

Answer:

A sense of right and wrong.

Hi!

Let's go over the meaning of moral development before we answer.

the process thought which children develop proper attitudes and behaviors toward other people in society, based on social and cultural norms, rules, and laws.

What can we infer from this? Well, this passage tells us that moral development is a process thought.

Based on the definition, we can say that the answer would be:

A sense of right and wrong.

Does this make sense? Lmk if not!

Hope this helps!

- Melanie

Answer:

id say B, but not sure

Explanation:

Answer: B-After new hypotheses related to the theory are tested in experiments.

Explanation:

A scientific theory can be define as a proposed explanation for a natural event or phenomena that is obtain after repeated experimental procedures. A scientific theory can be changed or amendments can be done in it's content with new discoveries and related evidences.

The implementation of the new technology can reduce the time to conduct the experiments and will also improve the accuracy. Therefore, a new hypothesis can be generated on the basis of the pre-proposed theory by utilizing the new technology.

-- A soccer ball eventually stops because its energy disappears. No. Energy does NOT "disappear".  That would exactly violate the whole concept of  energy conservation.

-- When a light bulb is turned on, electrical energy is converted to light and heat. Gosh Yes !  This statement tells where the energy comes from, what happens to it, and where it goes.  In a sloppy floppy way, it incorporates all of the highlights of energy conservation.

-- An automobile engine burns gasoline to converts its chemical energy to electrical energy. No.  When you look closely at this statement, MOST of the energy involved is missing and unaccounted for.  The statement only accounts for starting the motor and running the car radio.  It completely ignores the huge amount of mechanical energy produced from the gasoline.

Answer:

No

Yes

No

Explanation:

;0 literally just did it lol

Answer:

B

Explanation:

Since battery acid is an acid, it can be neutralised as all acid can be neutralised.

The battery acid can be easily neutralized, and therefore the statement that it cannot be neutralized is false statement.

Answer: Option B

Explanation:

The battery acid has acidic pH that is less than 7 pH but are actually weak acids and so they have pH around 6 or 7. In order to neutralize the acid, pH is to be raised achieving the neutral pH which is 7.

This can be done using the baking soda. Baking soda has alkaline property thereby, addition of baking soda will result into neutralization reaction, causing the battery acid to neutralize.

Answer:

0 newtons

Explanation:

F =MA

because constant motion means 0 acceleration.no changein velocity

F  = 5 x 0m/s²

F = 0

HOPE THIS HELPS THX

Answer: The amount of force that is required to keep the object in motion is 0 N

Explanation:

Force is defined as the push or pull on an object with some mass that causes change in its velocity.

It is also defined as the mass multiplied by the acceleration of the object.

Mathematically,

[tex]F=ma[/tex]

where,

F = force exerted on the object  

m = mass of the object = 5 kg

a = acceleration of the object = [tex]0m/s^2[/tex]   (Speed is constant)

Putting values in above equation, we get:

[tex]F=5kg\times 0m/s^2\\\\F=0N[/tex]

Hence, the amount of force that is required to keep the object in motion is 0 N

Answer: D

Explanation:

Option(D) is the two resistors connected in parallel.

A circuit exists simply a closed loop through which charges can continuously move. To establish that charges exist not only moving through the light bulb filament but also through the wires connecting the battery pack and the light bulb, a variation on the above activity exists completed.

A resistor exists as an electrical component that limits or restrains the flow of electrical current in an electronic circuit. Resistors can even be utilized to furnish a specific voltage for an active device such as a transistor.

A resistor exists as a passive two-terminal electrical element that implements electrical resistance as a circuit element. In electronic circuits, resistors exist used to reduce current flow, adjust signal levels, separate voltages, bias active elements, and terminate transmission lines, among other uses.

Resistors exist in parallel if their terminals are connected to identical two nodes. The equivalent overall resistance exists smaller than the smallest parallel resistor.

Here from the given options Option(D) is the  two resistors connected in parallel.

It is shown below (option d).

To learn more about Resistor refer to:

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To be honest, there's no sure way to answer that, because you haven't defined your terms and we can't be sure of what j or s might be.

Tell you what I'll do:. I'll assume definitions for j and s, and then I'll answer the question that I invented.

Assume that j stands for Joule, the unit of energy. And assume that s stands for 'second', the unit of time.

Then j/s is the rate of transferring energy or doing work.

Its unit is the Watt, equivalent to 1 Joule per second.

In your system of notation, it would be 'w' .

Answer:

Watts

Explanation:

Answer:

b

Explanation:

Then the mass of the gas divided by the moles will give the molar mass. Now divide g by mol to get the molar mass. Since N has a molar mass of 14 g/mol and O has a molar mass of 16 g/mol, the formula N2O would produce the correct molar mass.

Calculate the strength of the magnetic field at point B based on given data.

The strength of the magnetic field at B can be calculated using the inverse square law formula:

BB = BA * (dA/dB)2

Given BA = 5 units and dA = 1 unit, if dB = 3 units then BB = 5 * (1/3)2 = 5/9 = 0.56 units.

Therefore, the strength of the magnetic field at B is approximately 0.56 units.

Answer:

if it is slowing down than it is gaining potential energy

Explanation:

Answer:

20 meters per second

Explanation:

If an object accelerates for 2 seconds, and accelerates by 10 meters per second, then that objects speed will be 20 meters per second, assuming hat there are no other factors involved.

Answer:

20 meters per second

Explanation:

All you have to do is multiply 10 meter by the speed of two seconds which is 20 METERS PER SECOND

PLEASE MARK BRAINLIEST KIND PERSON :)

~Luis~

Final answer:

Chemical reactions involve the conversion of thermodynamic energy and kinetic energy. Thermodynamic energy changes determine if a reaction is exothermic or endothermic, while kinetic energy is needed to overcome activation energy. Potential energy stored in chemical bonds is often converted into other forms like mechanical kinetic energy.

Explanation:

Chemical reactions always involve changes in energy. There are two main types of energy relevant to reactions: thermodynamic energy and kinetic energy. Thermodynamic energy is related to the energy changes when reactants convert to products, which can be either released or absorbed. This type of energy change defines whether a reaction is exothermic or endothermic. Kinetic energy, on the other hand, is the energy that reacting molecules must possess to overcome the energy barrier to react and form products, known as the activation energy.

In the course of a reaction, chemical bonds break and new ones form. The energy stored in these bonds is a form of potential energy. When substances convert, there is a conversion of energy forms - for example, chemical potential energy can be converted to mechanical kinetic energy, such as in a car engine where the combustion of gasoline moves pistons.

Answer:

Bohr found experimental evidence for his atomic model by studying line spectra.

Answer:

Bohr found experimental evidence for his atomic model by studying line spectra.

Line Spectra is plural of a line spectrum and a line spectrum is an emission of light, sound, or other radiation, composed of a number of discrete frequencies or energies (a spectrum).

The answer is 25% because 50,000 is 25% of 200,000

The efficiency of a car's engine when given the heat input and waste heat is 50%.

The efficiency of a car's engine can be calculated using the formula:

Efficiency = (Useful Output Energy / Input Energy) x 100%

In this case, the heat input is 200,000 joules and the waste heat is 150,000 joules. Therefore, the efficiency can be calculated as:

Efficiency = (200,000 - 150,000) / 200,000 x 100% = 50%

So, the correct answer is not provided in the options. The efficiency of the car's engine is 50%.

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C. 50Hz. The wavelength of a wave on a string is 1.2m with a speed of 60m/s its frecueny is 50Hz.

The wavelength of a wave describes how long the wave is, and can be represented by the formula λ = v/f, where λ is the wavelenght in meters, v is the speed of the wave in m/s, and f is the frecuency of the wave in Hertz.

The wavelength of a wave on a string is 1.2m and its speed is 60m/s, to calculate its frecuency we have to clear f from the equation λ = v/f. So:

f = v/λ

f = (60m/s)/(1.2m)

f = 50 1/s = 50Hz

Answer:

c

Explanation:

Answer:

b. the rate at which charge moves through each

Explanation:

When two resistors are connected in series, they are connected in the same branch of the circuit.

This means that the current flowing through each resistor is the same.

However, current is defined as the rate at which charges move:

[tex]I=\frac{q}{\Delta t}[/tex]

where q is the amount of charge that flows through a given point in a time interval [tex]\Delta t[/tex].

Therefore, the correct answer is

b. the rate at which charge moves through each

Answer:

b. the rate at which charge moves through each

Explanation:

Answer:- Potential energy is the amount of energy a object has while it's at rest (or not moving) Kinetic energy is how much energy a object is while it's  moving

Explanation:

I don't understand what you mean by "the following" or "which of", and there are no suggestions listed to pick from.

If any of the THESE things is on this list in the place where you copied the question from, then it's the answer.  If none of these is on the list, then you're on your own.

-- A bowling ball on the floor in the upstairs closet.

-- A car up on the rack having an oil-change.

-- A helicopter hovering 10-ft off the ground.

-- A mosquito hovering 10-ft off the ground.

-- A helium party balloon hovering 10-ft off the ground, with its string tied to a chair.

-- A regular party balloon full of regular air, with its string tied to a chair, and dangling down the back of the chair.

-- A regular party balloon full of regular air, tied to a hook in the ceiling, dangling down but not reaching the floor.

-- A gallon of gasoline, in the tank of your car, that has not burned yet.

-- A kitchen match, in the box, that has not burned yet.

-- A birthday candle, standing up in the middle of a rose on the cake, that has not been lit yet.

-- A stick of dynamite that has not been lit yet, lying on the ground.

-- A firecracker that has not been lit yet, lying on the ground.

-- A squirrel sitting up in the tree watching me walk by on the ground.

-- A bird sitting up in the top of the tree watching the squirrel.

-- A chewed up piece of roast beef that has not been digested yet, lying in your stomach.

-- A chewed up piece of roast beef that has not been digested yet, lying in MY stomach. (A more satisfying example)

-- A tree branch that broke off in the wind yesterday and is lying on the roof of your house.

-- The air that is right under the ceiling in your bedroom.

-- YOU, when you are fast asleep in the top bunk in your bedroom.

-- A rifle bullet that was fired straight up, reached the peak of its trajectory, and is just about to start falling downward in 0.001 second from now.

-- The rocket that was launched, went straight up for a while, ran out of fuel, continued to coast straight up for a while, reached the peak of its trajectory, and is just about to start falling downward in 0.001 second from now.