Given the relatively modest number of calories burned by anything but the most vigorous activities, why can people consume over 2,000 kilocalories a day, yet maintain a healthy body weight?View Available Hint(s)Given the relatively modest number of calories burned by anything but the most vigorous activities, why can people consume over 2,000 kilocalories a day, yet maintain a healthy body weight?Not all calories are created equal, so a person who consumes 2,000 kilocalories of sugar- and fat-laden processed food will gain weight, whereas a person who consumes 2,000 calories of nonprocessed, low-carbohydrate food will not.People really should exercise vigorously for one to two hours per day.They can't, and this has led to a problem of obesity in the United States.Most of the energy consumed in food is spent maintaining the body's functions, so only a fraction of food energy needs to be burned in exercise.

Answers

Answer 1

Answer:

Much of the caloric intake is used to maintain normal body functioning -- heart rate, respiration, muscle contraction, etc..  Therefore, only some of the calories are actually stored as fuel for later use.

Explanation:

In the question, there is a comment to indicate that 2,000 of low-carbohydrate food will not cause weight gain.  This is not exactly accurate.  Weight gain depends upon what is taken in (calories in food) and what is expended (calories in activity).

There has to be moderation in what is consumed.  Consuming all fats or all carbs is not the answer.  Yes, fat has more calories per gram (9) than does carbohydrates (4.5), but it should be noted that if you take in too many calories in carbs, they will be converted and stored as fat.


Related Questions

The combining of light nuclei is called_____.

Answers

Answer:

fusion

Explanation:

It is called nuclear fusion

If the period of a simple pendulum is T and we increase its length so that it is four times longer, what will the new period be? T/4 It is unchanged. T/2 2T 4T

Answers

Answer:

2T

Explanation:

The period of a simple pendulum is:

T = 2π √(L/g)

If L is increased by a factor of 4, then:

2π √(4L/g)

4π √(L/g)

2T

So the period is doubled.

The new period will be 2T

[tex]\texttt{ }[/tex]

Further explanation

Simple Harmonic Motion is a motion where the magnitude of acceleration is directly proportional to the magnitude of the displacement but in the opposite direction.

[tex]\texttt{ }[/tex]

The pulled and then released spring is one of the examples of Simple Harmonic Motion. We can use the following formula to find the period of this spring.

[tex]\boxed{T = 2 \pi\sqrt{\frac{m}{k}}}[/tex]

T = Periode of Spring ( second )

m = Load Mass ( kg )

k = Spring Constant ( N / m )

[tex]\texttt{ }[/tex]

The pendulum which moves back and forth is also an example of Simple Harmonic Motion. We can use the following formula to find the period of this pendulum.

[tex]\boxed{T = 2 \pi\sqrt{\frac{L}{g}}}[/tex]

T = Periode of Pendulum ( second )

L = Length of Pendulum ( kg )

g = Gravitational Acceleration ( m/s² )

Let us now tackle the problem !

[tex]\texttt{ }[/tex]

Given:

initial period of a simple pendulum = T₁ = T

initial length of simple pendulum = L

final length of simple pendulum = 4L

Asked:

final period of a simple pendulum = T₂ = ?

Solution:

[tex]T_1 : T_2 = 2 \pi\sqrt{\frac{L_1}{g}} : 2 \pi\sqrt{\frac{L_2}{g}}[/tex]

[tex]T_1 : T_2 = \sqrt{\frac{L_1}{g}} : \sqrt{\frac{L_2}{g}}[/tex]

[tex]T_1 : T_2 = \sqrt{L_1} : \sqrt{L_2}[/tex]

[tex]T : T_2 = \sqrt{L} : \sqrt{4L}[/tex]

[tex]T : T_2 = 1 : 2[/tex]

[tex]\boxed{T_2 = 2T}[/tex]

[tex]\texttt{ }[/tex]

Learn moreModel for Simple Harmonic Motion : https://brainly.com/question/9221526Force of Simple Harmonic Motion : https://brainly.com/question/3323600Example of Simple Harmonic Motion : https://brainly.com/question/11892568

[tex]\texttt{ }[/tex]

Answer details

Grade: High School

Subject: Physics

Chapter: Simple Harmonic Motion

The attitude of the text about a subject is called the .

Answers

Answer:

The attitude of a text about a subject being discussed is called tone.

Answer:

tone

Explanation:

In a story the attitude of a character towards something shows us the character's tone. Tone is basically the emotion associated with a subject. Word choice or the arrangement of words allow a writer to express tone.

Mood and tone should not be confused the mood is the overall feeling the reader experiences while reading.

Which event would be impossible to explain by using john dalton’s model of the atom?

Answers

Answer: An iron atom emits particles when it is struck by light (by the photoelectric effect)

Explanation:

The first atomic model was the one proposed by Jhon Dalton, according to which it is postulated that:

"Matter is made up of indivisible, indestructible and extremely small particles called atoms."

That is, the atom is a solid and indivisible mass.

However, the fenomenom by which an iron atom emits particles when it is struck by light (known as the photoelectric effect) can not be explaind by this indivisible atom model.

To understand it better:

The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.

This is possible by considering light as a stream of photons, where each of them has energy. This energy is be able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.  This means the atom is not indivisible, but it is a composition of different particles.

In fact, currently it is known that each atom is composed of a nucleus and one or more electrons attached to the nucleus, which is composed of one or more protons and typically a similar number of neutrons.

The two measurements necessary for calculating average speed are…A. Acceleration and Time B. Velocity and Time C. Distance and Time D. Distance and AccelerationE. Displacement and Time

Answers

Answer:

C. Distance and Time

Explanation:

Speed is defined as the distance covered per unit of time. It is a scalar quantity and as such expressed in scalar terms. When we talk about speed, the direction of motion does not matter. We only try to find the rate at which a body moves with time.

It is expressed as:

                        Speed = [tex]\frac{Distance covered}{Time taken}[/tex]

The SI unit of speed is m/s or ms⁻¹

Final answer:

Average speed is calculated using the measurements of distance and time, making option C the correct answer. Speed is a scalar quantity and should not be confused with velocity, which includes direction.

Explanation:

The two measurements necessary for calculating average speed are distance and time. Thus, the correct answer to the question is C. Distance and Time. Average speed is defined as the total distance traveled divided by the elapsed time. When we express this mathematically, average speed is calculated using the formula:

Average speed = Total distance traveled / Elapsed time

It is important to note that speed is a scalar quantity, meaning it does not have a direction associated with it, while velocity is a vector quantity, which includes both magnitude and direction.

What is the number of protons in the nucleus of an element called?

Answers

Answer:

The number of protons within the nucleus of a given atom is equal to the atomic number of the corresponding element, which can be found on the periodic table. For example, the atomic number of helium is two. Therefore, the number of protons is also two

Explanation:

Step 1 - Gather Information

The first thing you will need to do is find some information about your element. Go to the Periodic Table of Elements and click on your element. If it makes things easier, you can select your element from an alphabetical listing.

Use the Table of Elements to find your element's atomic number and atomic weight. The atomic number is the number located in the upper left corner and the atomic weight is the number located on the bottom, as in this example for krypton:

Krypton's data from the Table of Elements

Step 2 - The Number of Protons is...

The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.

The interesting thing here is that every atom of krypton contains 36 protons. If an atom doesn't have 36 protons, it can't be an atom of krypton. Adding or removing protons from the nucleus of an atom creates a different element. For example, removing one proton from an atom of krypton creates an atom of bromine.

Step 3 - The Number of Electrons is...

By definition, atoms have no overall electrical charge. That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.

Electrons are arranged around atoms in a special way. If you need to know how the electrons are arranged around an atom, take a look at the 'How do I read an electron configuration table?' page.

An atom can gain or lose electrons, becoming what is known as an ion. An ion is nothing more than an electrically charged atom. Adding or removing electrons from an atom does not change which element it is, just its net charge.

For example, removing an electron from an atom of krypton forms a krypton ion, which is usually written as Kr+. The plus sign means that this is a positively charged ion. It is positively charged because a negatively charged electron was removed from the atom. The 35 remaining electrons were outnumbered by the 36 positively charged protons, resulting in a charge of +1.

Step 4 - The Number of Neutrons is...

The atomic weight is basically a measurement of the total number of particles in an atom's nucleus. In reality, it isn't that clean cut. The atomic weight is actually a weighted average of all of the naturally occurring isotopes of an element relative to the mass of carbon-12. Didn't understand that? Doesn't matter. All you really need to find is something called the mass number. Unfortunately, the mass number isn't listed on the Table of Elements. Happily, to find the mass number, all you need to do is round the atomic weight to the nearest whole number. In our example, krypton's mass number is 84 since its atomic weight, 83.80, rounds up to 84.

The mass number is a count of the number of particles in an atom's nucleus. Remember that the nucleus is made up of protons and neutrons. So, if we want, we can write:

Mass Number = (Number of Protons) + (Number of Neutrons)

For krypton, this equation becomes:

84 = (Number of Protons) + (Number of Neutrons)

If we only knew how many protons krypton has, we could figure out how many neutrons it has. Wait a minute... We do know how many protons krypton has! We did that back in Step 2! The atomic number (36) is the number of protons in krypton. Putting this into the equation, we get:

84 = 36 + (Number of Neutrons)

What number added to 36 makes 84? Hopefully, you said 48. That is the number of neutrons in an atom of krypton.

The interesting thing here is that adding or removing neutrons from an atom does not create a different element. Rather, it creates a heavier or lighter version of that element. These different versions are called isotopes and most elements are actually a mixture of different isotopes.

If you could grab atoms of krypton and count the number of neutrons each one had, you would find that most would have 48, others would have 47, some would have 50, some others would have 46, a few would have 44 and a very few would have 42. You would count different numbers of neutrons because krypton is a mixture of six isotopes.

In Summary...

How do changes in light wavelengths support the big bang theory?
A.Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.

B.Lights from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving toward the earth.

C.Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving towards earth.

D.Lights from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving away from the earth.

Answers

Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.  (A)

A. Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.

What is red shift in Doppler effect?

Redshift in doppler effect  is an example of the Doppler Effect. As an object moves away from us, the sound or light waves emitted by the object are stretched out, which makes them have a lower pitch and moves them towards the red end of the electromagnetic spectrum, where light has a longer wavelength.

The doppler red - shift of light observed from distant starts and galaxies gives evidence that the universe is expanding so , since it is a red light shift that means Lights from other galaxies shifts toward the red end of the spectrum and as the universe is expanding which shows that the galaxies are moving away from the earth.

hence correct option is A. Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.

learn more about Redshift in doppler effect

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An object is located 30.0 cm from a concave mirror. The focal length is 15.0 c,. What is the image distance?

A. 30.0 cm

B. -10 cm

C. 10.0 cm

D. -30.0 cm

Answers

Answer:

30.0 cm

Explanation:

We can use the mirror equation:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

f = +15.0 cm is the focal length of the mirror

p = 30.0 cm is the distance of the object from the mirror

q is the distance of the image from the mirror

Solving the equation for q, we find

[tex]\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{15.0 cm}-\frac{1}{30.0 cm}=\frac{1}{30.0 cm}\\q = 30.0 cm[/tex]

nanotechnology is unique, because it is (blank) enough to show quantum mechanical features but still large enough to be controlled and manipulated.

Answers

Answer: small

Explanation:

Nanotechnology is the technology that is responsible for the manipulation of matter on a nanometric scale ([tex]1nm=1(10)^{-9}m[/tex]). In addition, it works with the design at the atomic or molecular level.

This technology is based on nanoscience that is responsible for modifying or adulterating matter as it exists, but unlike common sciences, it does so at a molecular level, that is, on a very small scale. Thanks to this, it is possible to manufacture materials and machines from the rearrangement of atoms and molecules with various purposes, mainly industrial and medical.

Therefore:

Nanotechnology is unique, because it is small enough to show quantum mechanical features but still large enough to be controlled and manipulated.

Answer:

Answer is Small

Explanation:

A car travels from a to b with a speed of 30 km per hour and returns back to a with a speed of 50 km per hour . Find displacement, distance and average speed of the car

Answers

Explanation:

    30km/h -->

A-----------------B

  <-- 50km/h

Displacement = 0 (initial and final point are the same)

Distance=2AB

Average Speed=37.5km/h

In which step of the scientific method is information obtained through the senses?

Answers

Answer:

Making observations is the step of scientific method in which information is obtained through the senses.

Explanation:

Making observations is the step of scientific method in which information is obtained through the senses. This also happens to be the first step of the scientific method. Other steps include;

analyzing data

drawing conclusions

revising a hypothesis

Answer:

The correct answer will be-making observations (first step).

Explanation:

The senses are the physiological response of the external surrounding that allows us to live like sight, taste, smell, touch and hearing.

The scientific method begins with making observations of the natural world followed by framing a hypothesis which could be proved or disproved by performing experiments.

The senses allow us to sense the natural phenomenon through sensory organs which is included in the process of making observations.  

Thus, making observations is the correct answer.

A wave travels at a speed of 5.2 m/s. If the distance between crests is 0.40 m, what is the frequency of the wave? Use f=v/wavelength
A. 13 Hz
B. 2.1 Hz
C. 0.077 Hz
D. 5.6 Hz

Answers

A. 13 Hz.

The way to solve this problem is using the equation f = v/λ, where f is the frecuency of the wave, v the velocity of the wave and λ is the wavelength.

A wave travels at a speed of 5.2 m/s and the distane between crests is λ = 0.40 m. To find the frecuency of the way:

f = v/λ = 5.2 m/s / 0.40 m

f = 13 s⁻¹

f = 13 Hz

someone please help on this one?

Answers

Explanation:

the lights on Galaxy watch shifted of uniform amounts to what the rate in of the spectrum,regardless of the distance from Earth

Kirk wants to know if someone his height will go faster on a bike with a larger frame. What should he do next in order to follow the steps of the inquiry?

A. Predict the effect of bike size on the speed of a rider his height.

B. Design an experiment in which people his height ride bikes of various sizes.

C. Observe riders his height riding bikes of various sizes.

D. Time himself riding around a track on bikes belonging to several of his friends.

Answers

Answer:

The answer is A but I could be wrong

Answer: A. Predict the effect of bike size on the speed of a rider his height.

(Apex) Pretest

Which statement best describes copper?
A. It has a low resistance and prevents charges from moving freely.
B It has a high resistance and allows charges to move freely.
C. It has a high resistance and prevents charges from moving freely.
D. It has a low resistance and allows charges to move freely

Answers

Answer:

D. It has a low resistance and allows charges to move freely.

Explanation:

The high conductivity of copper allow charges to move freely without the need of too much force. The conductivity decreases with increase in resistance. Low resistance also means less heating of the conductors. This property of copper makes it ideal for use in the manufacture of electric cables and conductors for various gadgets.

The correct description of copper is that it has a low resistance and allows charges to move freely, making it a good conductor of electricity.

The statement that best describes copper is D. It has a low resistance and allows charges to move freely. Copper is a good conductor of electricity due to the presence of conduction electrons, which are the outermost electrons that are only loosely bound to the nucleus.

This arrangement allows these electrons to move easily from one atom to another within the material, facilitating the flow of electric charge. Copper's relative low electrical resistance makes it ideal for use in electric wiring, contributing to minimal energy dissipation in electrical systems.

Two friends are having a conversation. Anna says a satellite in orbit is in freefall because the satellite keeps falling toward Earth. Tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . Who do you agree with and why?

Answers

Answer:

free fall is any motion of a body where its weight is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it and it moves along a geodesic.As the only force acting on the orbiter is the force of gravity from the Earth, it is in free fall. Note the definition does not specify that the free fall must be directly at the source of gravity, only that the force (weight) is the only force. Anna is right but not because the satellite keeps falling toward the Earth. It's because the gravity force is the only force acting on the satellite. I must add: gravity force is the only applied force, there is also centrifugal force. But that's a reaction force, not an applied force.

Sodium Bicarbonate is a common _____

Answers

Sodium bicarbonate is a common base

Sodium bicarbonate is a common base. Please find more information on the base below.

What are bases in chemistry?

A base in chemistry is a class of substance characterized by being generally water-soluble, have a bitter taste, turns red litmus blue, and react with acids to form salts.

Sodium bicarbonate, also known as baking soda, is a salt of sodium hydroxide and carbonic acid. It has the chemical formula; NaHCO₃.

When sodium bicarbonate dissolves in an aqueous solution, it forms bicarbonate, which turns the solution basic, hence, it is said to act as a weak base in aqueous solution.

Learn more about bases at: https://brainly.com/question/13773045

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Given 4.8 moles of a gas at 37 degrees Celsius and at 792 torr, what is the volume of the gas? (The ideal gas constant is 0.0821 L · atm/mol · K and 1 atm = 760 torr.) 1.40 x 101 L 1.84 x 10-2 L 1.17 x 102 L 1.54 x 10-1 L

Answers

Answer:

1.17 x 10^2 L

Explanation:

We can find the volume of the gas by using the ideal gas law:

[tex]pV=nRT[/tex]

where we have:

[tex]p=792 Torr \cdot \frac{1 atm}{760 Torr} = 1.04 atm[/tex] is the pressure

V is the volume

n = 4.8 mol is the number of moles

R = 0.0821 L · atm/mol · K is the ideal gas constant

[tex]T=37^{\circ}+273 =310 K[/tex] is the temperature

Solving the equation for V, we find the volume

[tex]V=\frac{nRT}{p}=\frac{(4.8 mol)(0.0821 L atm/mol K)(310 K)}{1.04 atm}=117.5 L = 1.17\cdot 10^2 L[/tex]

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Answers

Answer:

https://brainly.com/question/11872573

Explanation:

all the credit goes to the user who answered this.

I do not have any rights on this.

Tip=>Please check your question in the search bar before asking.

Answer:

Explanation:

crust

The least penetrating form of radiation is

Answers

Answer: alpha radiation

Explanation:

Answer:

Answer:

1. emits energy when it decays

2. 0

3. helium nucleus

The least penetrating form of radiation: 4. alpha radiation

5. increases by 1

Explanation:

A volleyball player's hand applies a 39 N force while in contact with a volleyball for 2 seconds. What is the impulse on the ball? 20 N • s 37 N • s 41 N • s 78 N • s

Answers

Answer:78 N

Explanation:Impulse=Force*time

=39*2 =78 Ns

Answer:

78 N S

Explanation:

just got it right on edg 2021

A damaged 1200-kg car is being towed by a truck. Neglecting the friction, air drag, and rolling resistance, determine the extra power required (a) for constant velocity on a level road, (b) for constant velocity of 50 km/h on a 30° (from horizontal) uphill road, and (c) to accelerate on a level road from stop to 90 km/h in 12 s.

Answers

(a) 0 W

In this situation, the car is moving on a level road at constant velocity. This means that its acceleration is zero:

a = 0

But this also means that the net force acting on the car is zero, according to Newton's second law:

F = ma = 0

The power required to move the car is

P = Fv

where F is the force applied to the car and v the velocity. Since there are no air drag/frictional forces, the force applied to the car is exactly zero: so, the extra power needed to keep the car in motion at constant velocity is also zero.

(b) 81815 W

In this situation, the car is moving on an uphill road, so there is a component of the weight parallel to the incline acting agains the direction of motion of the car. This component of the weight is given by

[tex]W=mg sin \theta[/tex]

where

m = 1200 kg is the mass of the car

g = 9.81 m/s^2 is the acceleration of gravity

[tex]\theta = 30^{\circ} [/tex] is the angle of the incline

Substituting,

[tex]W=(1200 kg)(9.81 m/s^2)(sin 30^{\circ} )=5886 N[/tex]

So the truck must exerts an additional force of F = 5886 N to keep the car in motion at constant velocity.

The velocity of the car is

v = 50 km/h = 13.9 m/s

So the extra power needed is

P = Fv = (5886 N)(13.9 m/s) = 81,815 W

(c) 31250 W

Here the car accelerates to a final velocity of

v = 90 km/h = 25 m/s

from an initial velocity of

u = 0

So the work done on the car is equal to its change in kinetic energy, so:

[tex]W=K_f - K_i = \frac{1}{2}mv^2 - \frac{1}{2}mu^2 = \frac{1}{2}(1200 kg)(25 m/s)^2 -0 =3.75\cdot 10^5 J[/tex]

The extra power erogated by the truck therefore must be

[tex]P=\frac{W}{t}[/tex]

where

t = 12 s

is the time taken

Substituting,

[tex]P=\frac{3.75\cdot 10^5 J}{12 s}=31250 W[/tex]

If you push an object twice as far while applying the same force, you do...

Answers

Answer:

The work done is doubled

Explanation:

The work done on an object by a force is (assuming the force is parallel to the displacement of the object)

W = Fd

where

W is the work done

F is the magnitude of the force

d is the displacement of the object

In this problem:

- the force applied is the same

- the displacement of the object is doubled, d' = 2d

So the new work done will be

W' = Fd' = F(2d) = 2 (Fd) = 2 W

So, the work done is doubled.

Final answer:

Pushing an object twice as far with the same force results in doubling the work done due to the work being the product of force and distance. A greater change in momentum is also achieved since momentum change is proportional to the force application time.

Explanation:

When you push an object twice as far while applying the same force, you do double the work. This is because work is the product of force and the distance over which the force is applied. If we consider the equation for work, W = F × d, where W is work, F is force, and d is distance, by doubling the distance d while keeping the force F constant, the work done W is doubled. It is also essential to consider that if you are pushing an object on a surface with friction, you might have to apply more effort to overcome the frictional force.

According to Newton's second law, the acceleration of an object is proportional to the net force acting upon it and inversely proportional to its mass. From this, it follows that if you're pushing an object and increase the distance while maintaining the same force, the object's velocity will increase over a longer time, leading to a greater change in momentum, which is in line with the concept that the change in momentum is proportional to the time the force is applied.

Furthermore, the work-energy principle tells us that the work done on an object is equal to the change in its kinetic energy. Therefore, pushing an object twice as far with the same force means you've input twice the energy into the object, assuming no other external forces like friction or air resistance are doing work on the object.

Rocks that are formed as a result of deposits from weathering and erosion

Answers

Answer: Sedimentary rocks

Sedimentary rocks are formed from sediments and deposits of particles of various types, forms and sizes that are transported by air, wind or water, and then subjected to chemical processes to become rocks.

These types of rocks are usually found in the form of layers or strata in places where sediment accumulates due to the erosion of other materials, for example on the banks of rivers, in valleys, lakes (and any other type of body of water).

What is most widely accepted prediction for the future of the universe?
A.The universe will stop expanding and collapse.
B.The universe will end in a big bang.
C.The universe will stop expanding but will not collapse
D.The universe will continue expanding forever

Answers

The correct answer is d

Answer:  The correct answer is :  D. The universe will continue expanding forever    

Explanation:  The theory that has had more acceptance is that the universe will continue to expand indefinitely ending in a "big freeze", also called thermal death of the universe. This theory holds that in about a billion years the stars will go out and most of the universe will remain in darkness. The universe would be too cold to have life.

A machine uses 1000 J of electric energy to raise a heavy mass, increasing its potential energy by 300 J. What is the efficiency of this process?35%100%85%70%30%

Answers

Answer:

30 %

Explanation:

The efficiency of a machine is defined as:

[tex]\epsilon = \frac{E_{useful}}{E_{input}}[/tex]

where

[tex]E_{useful}[/tex] is the useful output energy

[tex]E_{input}[/tex] is the energy in input

In this problem,

- The useful output energy is the increase in potential energy of the mass, so 300 J

- The energy in input to the machine is 1000 J

Therefore, the machine's efficiency is

[tex]\epsilon = \frac{300 J}{1000 J}=0.30[/tex]

In percentage,

0.30 x 100 = 30 %

Which of the following properties increase as you move from left to right across a period? Select all that apply.A)Ionization energy B)NoneC)ElectronegativityD)Atomic radius

Answers

Answer:

B)None

Explanation:

A diver leaves the end of a 4.0 m high diving board and strikes the water 1.3s later, 3.0m beyond the end of the board. Considering the diver as a particle, determine: the magnitude of her initial velocity.

Answers

Answer:

4.0 m/s

Explanation:

The motion of the diver is the motion of a projectile: so we need to find the horizontal and the vertical component of the initial velocity.

Let's consider the horizontal motion first. This motion occurs with constant speed, so the distance covered in a time t is

[tex]d=v_x t[/tex]

where here we have

d = 3.0 m is the horizontal distance covered

vx is the horizontal velocity

t = 1.3 s is the duration of the fall

Solving for vx,

[tex]v_x = \frac{d}{t}=\frac{3.0 m}{1.3 s}=2.3 m/s[/tex]

Now let's consider the vertical motion: this is an accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. The vertical position at time t is given by

[tex]y(t) = h + v_y t - \frac{1}{2}gt^2[/tex]

where

h = 4.0 m is the initial height

vy is the initial vertical velocity

We know that at t = 1.3 s, the vertical position is zero: y = 0. Substituting these numbers, we can find vy

[tex]0=h+v_y t - \frac{1}{2}gt^2\\v_y = \frac{0.5gt^2-h}{t}=\frac{0.5(9.8 m/s^2)(1.3 s)^2-4.0 m}{1.3 s}=3.3 m/s[/tex]

So now we can find the magnitude of the initial velocity:

[tex]v=\sqrt{v_x^2+v_y^2}=\sqrt{(2.3 m/s)^2+(3.3 m/s)^2}=4.0 m/s[/tex]

If you blow across the top of an empty soft-drink bottle, a pulse of sound travels down through the air in the bottle. At the moment the pulse reaches the bottom of the bottle, what is the correct description of the displace- ment of elements of air from their equilibrium positions and the pressure of the air at this point? (a) The displacement and pressure are both at a maximum. (b) The displacement and pressure are both at a minimum. (c) The displace- ment is zero, and the pressure is a maximum. (d) The displacement is zero, and the pressure is a minimum.

Answers

Answer:

c) the displacement is zero and pressure is at a maximum

Explanation:

When the heat source is removed from a fluid, convection currents in the fluid will eventually ____________then stop.

Answers

When the heat source is removed from a fluid, convection currents in the fluid will eventually distribute heat uniformly throughout the fluid.  When all of the fluid is at the same temperature, convection currents will stop.

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