Physics High School

An exothermic reaction ___ energy.

A) releases

B) absorbs

C) creates

D) decreases

Answers

Answer 1
Well, an exothermic reaction is a reaction, that involves the release of heat. So your answer would be A, "releases".

Good luck!

Related Questions

How much energy from the sun actually reaches the corn answer?

Answers

The energy from the sun that reaches the corn is about two billionths.

Answer:

It depends upon the sunlight intensity known as ALBEDO, the amount of energy used by photosynthesis and the chemical composition of corn.

Explanation:

Albedo is a measure of the amount of light reflected from an object. Albedo is normally expressed as a decimal value representing the percentage of light reflected.

Photosynthesis, a biological process, uses the energy of sunlight to manufacture sugar, which serves as the universal food for life. Oxygen produced as a product of photosynthesis is released into the environment.

The formula for this reaction is:

6CO2 + 6H2O + sunlight energy → C6H12O6 + 6O2

• where CO2 represents carbon dioxide

• H2O represents water

• C6H12O6 represents the sugar molecules (carbohydrate)

• and O2 represents oxygen


Which prefix is needed when naming SO3? A. tri- B. penta- C. mono- D. di-

Answers

Hello there, and thank you for posting your question here on brainly.

Answer: A. tri- because the scientific name for it is 'Sulfur Trioxide', it also has a 3 in the name. Tri means 3.

Hope this helped you! ♥

Answer:

A). tri-

Explanation:

As we know that here in the given compound we have one sulfur and three oxygen atoms.

So here in this nomenclature we can say that

one = mono

two = di

three = tri

five = penta

so above are the different prefix which we will use in different cases when atoms are arranged in different numbers.

Since we have three atoms here for oxygen so the prefix must be "tri" here in this case

The lowest surface temperature yet measured on anybody in the solar system is negative 200 degrees celsius occurring on

Answers

The answer is C. Triton 

If the spectrum of a star is blue shifted, which way is the star moving?

Answers

This shifts the star's spectral lines toward the blue end of the spectrum. If the star ismoving away from us, its waves are effectively stretched out when they reach Earth, increasing their wavelength. This shifts the star's spectral lines toward the red end of the spectrum.
if it's blue shifted, the star is moving towards us 

A humming bird feeder is tied by a rope to a tree branch. You notice that in a gentle breeze, the feeder moves back and forth 15 times in 1 minute. How long is the rope?

Answers

With the fifteen cycles in one minute, you can first get the frequency of this pendulum which is in cycles per second or 1/4. Frequency is 1/ period so your period length is 4 you then use the period length of a pendulum equation solving for length. (equation: Period Length = 2[tex] \pi [/tex][tex] \sqrt{\frac{Length}{Gravity} } [/tex]. The length of the rope is 3.97 or about 4 meters. ( the question never asked what unit the rope is measured in, but I'm assuming it wanted meters)

A car drives over a hilltop that has a radius of curvature 120 m at the top of the hill. at what speed would the car be traveling when it tires just barely lose contact with the road when the car is at the top of the hill?

Answers

The speed of a car travelling over a hill that has a radius of curvature should not exceed a certain speed other it will topple. This speed is related to the radius of curvature and the gravitational acceleration as shown below:

V^2 = Rg, where V = maximum speed, R = Radius of curvature, g = gravitational acceleration.

Substituting;
V = Sqrt (Rg) =  Sqrt (120*9.81) = 34.31 m/s

Final answer:

The car would be traveling about 122 km/h when its tires just barely lose contact with the road at the top of a hill with a radius of curvature of 120 m.

Explanation:

This problem can be solved by using the concept of centripetal force. When the car's tires barely lose contact with the road, the only force acting on it will be the gravitational force. This gravitational force, or the weight of the car, must provide the required centripetal force for the car to stay in circular motion. Hence, we equate centripetal force to the gravitational force. This sets up the equation mg = mv²/r, where m is the mass of the car, g is the acceleration due to gravity, v is the velocity, and r is the radius. Notice that the mass of the car cancels out.

Solving this equation, we calculate the velocity v as √(g×r) = √(9.8×120) ≈ 34 m/s, which is about 122 km/h. Please note that the given figure of 165 km/h seems inconsistent with the radius provided in the question and commonly accepted value for gravity. However, for a steeper curve or a higher banking angle, the speed at which the car loses contact with the road could indeed be higher.

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the atomic mass is important because?
a. it tells you the size of the atom
b.it tells you the number of electrons

Answers

B is correct answer.

The atomic mass is the most important because it tells you the number of electrons.

Hope it helped you.

-Charlie 
b.it tells you the number of electrons

What is a half circle that extends from the north pole to the south pole?

Answers

I believe the answer is meridian. "A (geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude." -wikipedia

Which property of an optical telescope is associated with sharper images?

Answers

The answer is Resolving power.  Resolving Power of an optical telescope is associated with sharper images.  It also depend upon the size of the objective (the primary lens or mirror that collects and focuses the light) The larger the objective, the more light the telescope collects and the finer detail it resolves..

Velocity is the change of speed and/or direction of An object true or false

Answers

False.
I hope this helps! :)
No.
CHANGE of speed or direction is the object's acceleration.
Velocity is the speed and direction themselves, without change.

if energy is absorbed because of a chemical reaction the reaction is ____. a product, exothermic, limiting, endothermic.

Answers

If energy is absorbed because of a chemical reaction the reaction is Endothermic.

Answer: Option D

Explanation:

There are two types of chemical reaction depending upon whether the energy is absorbed or released to the surroundings. When the energy is absorbed in a reaction from the surroundings it is called as an endothermic reaction and the temperature of the surroundings gets affected.

When the opposite reaction occurs in the surroundings, it is called as an exothermic reaction. Option A and B are irrelevant to the situation here. So if the energy is absorbed because of a chemical reaction then the reaction is said to be endothermic.

Researchers have found that the ________ lobes of the brain are more active when we experience positive emotions, while the ________ lobes of the brain are more active when we experience negative emotions.

Answers

Hello!:

Answer:

Researchers have found that the left frontal lobes of the brain are more active when we experience positive emotions, while the right frontal lobes of the brain are more active when we experience negative emotions.

The frontal lobe of the brain has some functions such: movement control,  behavior control, high-level mental functions and emotion control. 
Final answer:

The frontal lobes of the brain are more active with positive emotions, and the right hemisphere is more active with negative emotions, reflecting their respective roles in emotional processing.

Explanation:

Researchers have found that the frontal lobes of the brain are more active when we experience positive emotions, while the right hemisphere is more active when we experience negative emotions. The frontal lobe, involved in reasoning, motor control, emotion, and language, has been linked to the processing of positive emotions and is located in the forward part of the brain, extending back to a central sulcus. In contrast, the right hemisphere is associated with arousal and negative emotions, suggesting a lateralization effect in emotional processing.

Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. This same unknown tuning fork and a 250 Hz tuning fork are struck. Six beats are heard. Its exact frequency?

Answers

The absolute difference between two frequencies is referred to as beat frequency. That is,
fb = |f2-f1|

In this case, the frequency of unknown fork must be between 240 Hz and 250 Hz. Then,

4 = x - 240 => x = 240+4 = 244 Hz
This is true since;
6 = 250 - 244 (given in the second case).

Therefore, the unknown frequency is 244 Hz.

What total distance will a sound wave travel in air in 3.00 seconds at stp?

Answers

At stp conditions ([tex]T=0^{\circ}C[/tex]), the speed of sound is
[tex]v=331.2 m/s[/tex]
The sound wave moves by uniform motion, so we can use the basic relationship between space, time and velocity:
[tex]S=vt[/tex]
where S is the distance covered by the sound wave in a time t. In our problem, t=3.00 s, therefore the distance covered by the sound wave is
[tex]S=vt=(331.2 m/s)(3.00 s)=993.6 m[/tex]

Which kind of star is most likely to spend the longest time on the main sequence?

A.) A low-mass red star
B.)A yellow star like
the sun
C.) a high-mass blue star
D.) a bright white star

Answers

A, a low-mass red star

Answer: 1. c . Nebula

2. a. low mass red star

3. d. turn into white dwarfs

4. c. 10 billion years

Explanation:

According to lenz's law, the magnetic field of an induced current in a conductor will

Answers

According to lenz's law, the magnetic field of an induced current in a conductor will have a direction such that it opposes the change in magnetic flux through the area enclosed by the conductor itself.

In other words: if the magnetic flux through the area enclosed by the conductor is increasing, then the direction of the induced current will be such that the magnetic field produced by this current will oppose this increasing of magnetic flux (so, the induced magnetic field will be directed in the opposite direction of the initial magnetic field). 
Vice-versa, if the magnetic flux through the area enclosed by the conductor is decreasing, then the direction of the induced current will be such that the magnetic field produced by this current will oppose this decreasing of magnetic flux (so, the induced magnetic field will be directed in the same direction as the initial magnetic field). 

Lenz's law states that the magnetic field produced by an induced current in a conductor opposes the change in the external magnetic field that caused the induced current. This behavior is a consequence of energy conservation and serves to maintain a constant magnetic flux through the conductor.

Lenz's Law and Induced Current

According to Lenz's law, the magnetic field of an induced current in a conductor will oppose the change that induced it. When the magnetic flux through a conductor changes, it induces an electromotive force (emf) and, consequently, a current in the conductor.

This induced current generates its own magnetic field. The direction of this induced magnetic field is such that it opposes the change in the external magnetic field that caused the induction. For instance, if the magnetic field within a loop is increasing, the induced current will flow in a direction that creates a magnetic field opposing the increase, preserving the magnetic flux.

If the original magnetic field is decreasing, the induced current will produce a magnetic field that reinforces the original field, again opposing the decrease in flux. This opposition is part of the conservation of energy, ensuring that the system does not create or destroy energy, thus preventing a perpetual motion scenario. Overall, Lenz's Law is a manifestation of the conservation laws in electromagnetism.

Which is the best example of a cycle: a turn of a wheel or a slide down a ski slope?

Answers

Definitiely a turn of a wheel. Skiing down a ski slope is going down at an angle and it's usually straight. The turn of a wheel just makes a lot more sense

Final answer:

The best example of a cycle is a turn of a wheel, as it involves a repetitive motion that returns to its starting point, unlike a slide down a ski slope which is a linear motion.

Explanation:

When discussing the concept of a cycle, a turn of a wheel is the best example, as it involves a repetitive motion that returns to its starting point. As the wheel turns, each point on its circumference moves in a circular motion and eventually comes back to where it began, completing one cycle. This represents a continuous, recurring sequence over time and is often depicted in physics and other sciences when explaining rotational motions.

In contrast, a slide down a ski slope is a linear motion that does not inherently return to its starting point, thus not forming a cycle. While one may cycle up and down the slope repeatedly, the slide itself is not cyclical.

For instance, Bug B on a spinning wheel demonstrates this concept of a cycle perfectly as it continuously moves in a circle.

Which element has a full valence shell of electrons

Answers

All of the noble gases have full valence shells, such as neon, xenon, and krypton. They all have 8 valence electrons, with the exception of helium, which has 2.

Helium , Neon , argon, xenon and radon  all are noble gases and have full valence shell of electron

What are noble gases ?

The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive.

The 18th group in the modern periodic table is of noble gases, because their outer most shell is completely filled as it have 8 electrons in the outermost shell , except helium which have 2 electrons in outermost shell ( He have only one shell )

Helium , Neon , argon, xenon and radon  all are noble gases and have full valence shell of electron

learn more about noble gases

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Sully is riding a snowmobile on a flat, snow-covered surface with a constant velocity of 10 meters/second. The total mass of the snowmobile, including Sully, is 280 kilograms. If Sully accelerates to a velocity of 16 meters/second over 10 seconds, what’s the force exerted by the snowmobile to accelerate? Use F = ma, where . 160 N 168 N 248 N 280 N 324 N

Answers

Answer: 168N

16 - 10 = 6
6 / 10 = .6
F = 280 x .6 = 168
16 - 10 = 6
6 / 10 = .6 (this sign / means to divide)
F = 280 x .6 = 168

a proton is moving horizontally at 7.9 x 10^5 m/s. It passes through a vertical magnetic field that points downward. In which direction is the proton deflected by the magnetic field? A. up B. to the right of its velocity C. down D. to the left of its velocity

Answers

There are four key characteristics of the magnetic force on a moving charge.

First, Its magnitude is proportional to the magnitude of the charge. 
Second, the magnitude of the force is also proportional
Third, the magnetic force depends on the particle’s
velocity. 
Fourth, we find by experiment that the magnetic force [tex]\vec{F}[/tex] does not have the same direction as the magnetic field [tex]\vec{F}[/tex] but instead is always perpendicular to both [tex]\vec{B}[/tex] and the velocity [tex]\vec{v}[/tex] 

So, in a mathematical language this is given by:

[tex]\vec{F}=q\vec{v} \times \vec{B}[/tex]

So, this is a cross product. Therefore, applying the Right-hand rule:

The answer is:

D. to the left of its velocity.

Explaining this in other words:

"The force [tex]\vec{F}[/tex] is directed into the plane of the paper, so this is the direction of the proton"

How many coulombs of charge are needed to produce 29.1 mol of solid zinc?

Answers

The chemical equation in this case is given by:

Zn (2+) + 2e (-) ------> Zn

It can be noted that 1 mole of Zn is produced by 2 Faraday of electricity.
For 29.1 moles,
Total charge required = 2*29.1 = 58.2 F

But, 1F = 96500 C
Then,
Amount of charge required = 96500*58.2 = 5,616,300 C
Final answer:

To produce 29.1 mol of solid zinc, approximately 2801443.5 Coulombs of charge are needed.

Explanation:

To calculate the number of coulombs of charge needed to produce 29.1 mol of solid zinc, we need to use Faraday's constant, which is approximately 96485 C/mol.

Charge (in coulombs) = Faraday's constant x number of moles of substance

In this case, Charge = 96485 C/mol x 29.1 mol = 2801443.5 C.

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Rain or snow usually falls on the leeward side of a mountain range true or false

Answers

The answer is False.  Rain or snow usually falls windward side of a mountain range, not leeward.  In areas where moist air often blows across a mountain range, the windward side of the mountains (the side the wind reaches first) may receive large amounts of precipitation. Because the air cools as it rises, some of its moisture condenses and may fall as rain or snow.

Answer:

false

Explanation:

which direction will the magnetometer read for earth’s magnetic field when the satellite passes over earths equator ?

Answers

Earth's magnetic field is represented as lines of force appearing straight up from one pole towards the other pole, following the curvature and bending back down towards the Earth as they near the pole at the other end. The pointers on your satellite will continually align themselves with these lines of force. Thus, near either pole, the pointers will point downward, toward the Earth. Near the equator, they will point more or less horizontally, parallel to the Earth. The satellite should be made of nonmagnetic materials, so as not to conduct electricity.
Final answer:

A magnetometer over the Earth's equator will detect Earth's magnetic field as a horizontal line pointing northward. As one moves west along the equator, the detected orientation of the magnetic field by the magnetometer remains constant due to the parallel nature of the magnetic field lines at this latitude.

Explanation:

When a satellite equipped with a magnetometer passes directly over the Earth's equator, the primary direction the magnetometer will read for the Earth's magnetic field is horizontal and points towards the magnetic north pole. Since we are assuming the Earth's magnetic north is aligned with the geographic north pole, the magnetometer reading will be directed northward, perpendicular to the equator.

As the student or satellite moves west along the equator, the orientation of the magnetic field detected by the compass or magnetometer would not significantly change. This is because at the equator, the Earth's magnetic field lines are parallel to the Earth's surface, resulting in a compass needle aligning horizontally and pointing towards the north pole. Even while travelling, this horizontal alignment remains constant all along the equator.

Remember, magnetic field lines around a magnetic source, like Earth, follow a path from the magnetic north pole to the magnetic south pole. Also, a compass needle aligns itself with the local magnetic field lines. At the equator, these lines are parallel to the ground, dictating the needle's orientation.

What is the biggest star in our solar system?

Answers

The Biggest star in our universe is the sun. Although the largest in the galaxy is the VY Canis Majoris which is about 3,900 to 5000 light years away from us.
The biggest star in our solar system is the sun. It's also the smallest one, because it's the only one.

A sound wave of frequency 440 hz travels at a speed of 344m/s through the air in a concert hall. how fast would a note one octave higher, 880hz travel through the same concert hall?

Answers

The speed of a sound wave does not depend on the frequency of the wave, but only on the properties of the medium.

Since we are in the same concert all, the medium of propagation is still the same (the air), so it has not changed; therefore, the speed of the sound wave has not changed, and it is still 344 m/s.

So, the correct answer is "344 m/s".

What is the potential energy of a 0.5 kg object sitting on a shelf that is 1.5 meters high?

Answers

gravitational potential energy=mass x height X gravitational field strength
=0.5 x1.5 x9.7(gravity)=7.275J

Answer:

what is the potential energy of a 5 kg apple that is sitting on a 1.5 m high tree branch

Explanation:

Which property of matter allows convection currents to form? Fluids rise if they are less dense than the matter around them. The molecules in solids do not vibrate very quickly. Electromagnetic waves carry energy. Liquids take the shape of their container.

Answers

the answer is a : fluids rise if they are less dense than the matter around them ! i hope this helped, despite being so late

The difference in potential between the cathode and anode of a spark plug is 14700 v. what energy does the electron give up as it passes between the electrodes? answer in units of j.

Answers

The energy the electron gives up passing between the electrodes is equal to the product between its charge and the potential difference between the electrodes:
[tex]\Delta U = e \Delta V[/tex]
where 
e is the electron charge
[tex]\Delta V[/tex] is the potential difference

Plugging numbers into the equation, we find that the electron gives up is
[tex]\Delta U = (1.6 \cdot 10^{-19} C)(14700 V)=2.35 \cdot 10^{-15} J[/tex]

Can someone explain to me #4.

Answers

a) We balance the masses: 4(1.00728) vs 4.0015 + 2(0.00055)4.02912 vs. 4.0026This shows a "reduced mass" of 4.02912 - 4.0026 = 0.02652 amu. This is also equivalent to 0.02652/6.02E23 = 4.41E-26 g = 4.41E-29 kg.
b) Using E = mc^2, where c is the speed of light, multiplying 4.41E-29 kg by (3E8 m/s)^2 gives 3.96E-12 J of energy.
c) Since in the original equation, there is only 1 helium atom, we multiply the energy result in b) by 9.21E19 to get 3.65E8 J of energy, or 365 MJ of energy.

What is the intensity of sound waves produced by a trumpet at a distance of 1.6 m when the power output of the trumpet is 0.30 w?

Answers

The intensity of a wave is given by the ratio between the power  P of the source and the surface A over which it is calculated:
[tex]I= \frac{P}{A} [/tex]

For the sound wave in this problem, the power is P=0.30 W. Since a sound wave propagates radially, the area that we should use is the surface of of a sphere with radius r=1.6 m:
[tex]A=4 \pi r^2 = 4 \pi (1.6 m)^2 =32.15 m^2[/tex]

Therefore, the intensity is
[tex]I= \frac{P}{A}= \frac{0.30 W}{32.15 m^2}=9.33 \cdot 10^{-3} W/m^2 [/tex]

The intensity of the sound waves at a distance of 1.6 meters from the trumpet is approximately[tex]\( 9.325 \times 10^{-3} \)[/tex] watts per square meter.

The intensity of the sound waves produced by the trumpet at a distance of 1.6 meters is given by the formula:

[tex]\[ I = \frac{P}{A} \][/tex]

The area of a sphere is given by [tex]\( A = 4\pi r^2 \)[/tex], where r  is the radius of the sphere.

Given:

- Power output of the trumpet, [tex]\( P = 0.30 \)[/tex] watts

- Distance from the trumpet, [tex]\( r = 1.6 \)[/tex] meters

 First, we calculate the area A  through which the sound waves are spreading at a distance of 1.6 meters:

[tex]\[ A = 4\pi r^2 = 4\pi (1.6)^2 \][/tex]

[tex]\[ A = 4\pi (2.56) \][/tex]

[tex]\[ A = 4\pi \times 2.56 \][/tex]

[tex]\[ A \ = 4 \times 3.14159 \times 2.56 \][/tex]

[tex]\[ A \ = 32.17 \][/tex]

Now, we calculate the intensity  I:

[tex]\[ I = \frac{P}{A} \][/tex]

[tex]\[ I = \frac{0.30}{32.17} \][/tex]

[tex]\[ I \ = \frac{0.30}{32.17} \][/tex]

[tex]\[ I \ = 0.009325 \][/tex]

[tex]\[ I \ = 9.325 \times 10^{-3} \][/tex]

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