Answer:
It's D
Explanation:
I have the answer key
Which of the following is the method by which air is cooled in the food storage component of a refrigerator?
Question 18 options:
Evaporation
Radiation
Conduction
Convection
Answer: Convection :)
Answer:
D. Convection
Explanation:
The air inside the refrigerator is cooled by convection, which circulates colder air around the food and warmer air out of the refrigerator.
Whose contributions to astronomy explained how planets were held in their orbits?
A. Aristotle
B. Copernicus
C. Ptolemy
D. Newton
E. Brahe
F. Kepler
Answer:
D newton
Explanation:
he did extensive research on gravity, and gravity is what holds planets in orbits.
What is the medium of a mechanical wave?
A mechanical wave requires a medium to propagate, which can be any substance or material that can transmit the wave motion.
Explanation:In physics, a mechanical wave is a type of wave that requires a medium to propagate. The medium can be any substance or material, such as air, water, or a solid object, as long as it can transmit the wave motion.
For example, when you throw a stone into a pond, the ripples that spread out are mechanical waves. The water in the pond acts as the medium through which the wave is transmitted.
Other examples of mechanical waves include sound waves, which require a medium like air or water to travel through. So, in summary, the medium of a mechanical wave is the substance or material that carries the wave energy.
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The slope of a linear velocity-time graph tells us the _____ of the object.
A. Speed
B. Acceleration
The object's acceleration is indicated by the slope of a linear velocity-time graph. Option (B) is the best choice.
A linear velocity-time graph's slope is a representation of an object's acceleration. Acceleration is the rate at which velocity changes in relation to time. When the velocity-time graph is a straight line, a constant acceleration is indicated by the slope of the line.
The acceleration increases with slope steepness and might be positive or negative depending on the slope's direction. If there is no slope (i.e., a horizontal line), there is no acceleration, which means the item is traveling at a constant speed.
As a result, the acceleration is indicated by the slope of the velocity-time graph. (B) is the best choice.
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Why are chemical equations useful?
A) Chemical equations prevent scientists from making mistakes.
B) Chemical equations determine the viscosity of a liquid.
C) Chemical equations predict what will happen in a chemical reaction.
D) Chemical equations fix a reaction to get the right products.
Chemical equations are useful because the Chemical equations predict what will happen in a chemical reaction. The correct option is option (C).
Chemical equations are valuable tools in chemistry as they allow us to represent and understand chemical reactions. They provide a concise and standardized way to describe the reactants, products, and stoichiometry of a chemical reaction. Here are some reasons why chemical equations are useful:
1) Predicting reaction outcomes.
2) Quantifying reactants and products.
3) Communication and record-keeping.
4) Conservation of mass.
Therefore, while chemical equations do not prevent mistakes or fix reactions, they are primarily used to predict reaction outcomes, quantify substances involved, and provide a common language for communication and record-keeping in chemistry. The correct option is option (C).
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a cast iron paperweight is in the shape of a half-sphere with a diameter of 8.2cm. The cast iron has a density of 7.3g/cm^3. What is the mass of the paperweight, in grams?
a. 16860
b.8430
c.1054
d.2107
Answer: C
1054 g
Explanation:
Given that the object is in the shape of semi sphere with diameter of 8.2cm. And density of 7.3g/cm^3.
From definition of density,
Density = mass/volume
Volume of a half - sphere = 2/3πr^3
Volume = 2/3 × 3.143 × 4.1^3
Volume = 144.35 cm^3
Let make mass the subject of formula
Mass = Density × volume
Mass = 7.3 × 144.35
Mass = 1053.74g
The mass of the paperweight, in grams is 1054
1. What are the approximate calorie needs of a
sedentary 16 year old male?
A. 1.800 calories C. 2,200 calories
B 2.000 calories D. 2,400 calories
Answer:
D. 2,400 calories
This is the acceleration of an object increases by the force applied to it and decreases based on its mass?
Answer:
who knows bsf
Explanation:
Which of the following correctly pairs the subatomic particle with its charge?
Select one:
a. Proton—neutral
b. Proton—positive
c. Neutron—negative
d. Neutron—positive
Answer: b:
Explanation:
protons are positive,
electrons are negative,
and neutrons are neutral.
the amount of electrons to protons is always the same in a balanced atom.
electrons can be removed creating "ions" which is simply an unbalanced atom. removing protons would result in a different type of atom or element.
Taking into account the definition of neutron, electron and proton, the correct answer is option b. Proton - positive
The atom is defined as the smallest particle into which an element can be divided without losing its chemical properties.
Protons, neutrons, and electrons are the particles that make up the atom. These particles determine the characteristics and properties of the chemical elements.
The protons and neutrons are concentrated in the atomic nucleus, while the electrons are distributed in the crust or the periphery of the atom.
Neutrons have no net electric charge, unlike the proton which has a positive electric charge. Lastly, electrons have a negative electrical charge.
Then, the correct answer is option b. Proton - positive
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2.55*10^ -4 C charge has an electric potential energy of 35.7 J when it is placed 0.437 m from a second charge. What is the value of the second charge?
Answer: 6.80
Explain: Trust me
The general formula for an acid is
Answer:
To write the general formula for an acid, we fix one atom which is hydrogen because this atom is common to all the acids. General formula for acid is written by HX. where H represents Hydrogen atom.
Explanation:
The general formula for an acid is HA, where 'H' represents a hydrogen ion and 'A' is the conjugate base after the proton donation. Acid-base reactions follow the general equation of acid + base
ightarrow salt + water, and acids react with metals to form a salt and hydrogen gas.
The general formula for an acid in chemistry can be written as HA, where 'H' represents a hydrogen ion that can be donated, and 'A' represents the remainder of the acid molecule that forms the conjugate base after the acid donates its proton. When an acid reacts, such as in an acid-base reaction, it follows the equation acid + base → salt + water, which for a reaction with a metal hydroxide specifically becomes acid + metal hydroxide → salt + water. In the reaction of an acid with a pure metal, the general word equation is: acid + metal → salt + hydrogen gas. The type of salt and the details of these reactions can vary depending on the specific acid and other reactants involved.
Two questions. 10 points.
With the same force applied, which of these will have a greater acceleration?
F.100g mass
G.200g mass
H.300g mass
J.All the objects would have the same acceleration.
A 22.4kg object is accelerating at 1.40m/s2. What net force is being applied to the object?
A 16.0 N
B 21.0 N
c 23.8 N
D 31.4 N
From Newton's Second Law of Motion, acceleration is given by this formula:
[tex]Accelertaion = \frac{Force}{Mass}[/tex]
From the above formula, we can deduce that acceleration is inversely proportional to the mass of an object. Thus, the smaller the mass of an object, the greater would be its acceleration when the same force applied.
Therefore, the 100 gram mass will have a greater acceleration with the same force applied.
Question 2.
Given the following data:
Mass = 22.4 kg.Acceleration = 1.40 [tex]m/s^2[/tex].Mathematically, net force is given by this formula;
[tex]Net\;force = mass \times acceleration[/tex]
Substituting the given parameters into the formula, we have;
[tex]Net\;force = 22.4 \times 1.40[/tex]
Net force = 31.4 Newton.
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Final answer:
The 100g mass will have the greatest acceleration when the same force is applied, due to Newton's second law of motion. For the second part, the net force being applied to a 22.4kg object accelerating at 1.40m/s^2 is closest to 31.4 N.
Explanation:
The first part of the question asks: With the same force applied, which of these will have a greater acceleration? The options are 100g mass, 200g mass, 300g mass, and all objects having the same acceleration. According to Newton's second law of motion, acceleration is inversely proportional to mass when the force applied is constant. Therefore, the 100g mass will have the greatest acceleration (option F).
For the second question, a 22.4kg object is accelerating at 1.40m/s2. To find the net force being applied to the object, we use the formula F = ma, where F is the force, m is the mass, and a is the acceleration. Plugging in the values, we get F = 22.4kg * 1.40m/s2 = 31.36 N.
Therefore, the closest answer is option D, 31.4 N.
In the illustration above the moon is in the position called
new moon
moonstone
full moon
bright moon
Answer:
new moon
Explanation:
The new moon is the first lunar phase and is seen as a thin waxing crescent and its shape is formed the direct sunlight as viewed from the earth and stays form 6 am to 6 pm. It varies slightly due to its elliptical orbit and these phases are due to the angles from were the observer can see the moon illumination by the sun as it orbits the planet and the moon reflects the light received from the sun.What do fire investigators begin their search with?
O A.
The suspect
OB.
The point of origin
OC. The place with the most damage
D.
There is no general starting point
Reset
bext
Fire investigators begin their search with the point of origin, which is the location where the fire started. This helps them determine the cause of the fire and they can do this by examining damage patterns and looking for ignition sources.
Explanation:In the process of investigating a fire, fire investigators typically begin their search with the point of origin. The point of origin is the location where the fire started. It is the most critical area in any fire investigation as it helps in determining the cause of the fire. Locating the point of origin involves carefully examining the fire scene, observing patterns of fire damage, and often working backwards from the areas of least damage towards the areas of most damage. Once the point of origin has been located, the investigators then look for sources of ignition, fuels, and any potential accelerants that may have contributed to the spread of the fire.
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The Earth orbits the sun with a speed of about 67000 miles per hour. If the Earth was to suddenly stop, it would
Answer: It would destroy the Earth's surface.
I remember reading this questions in What If? by Randall Munroe. Great book, I suggest you check it out. Anyway, the answer. The Earth is revolving as well as spinning on its axis at the same time. This basically means that thee atmosphere is also spinning at the same speed. But due to the frame of reference, we don't notice anything. If the Earth suddenly stops spinning, then the atmosphere, going according to the first law of motion will still be spinning at the same speed. This would produce supersonic winds at such a scale that it will be compared to an atomic explosion. Anything not in a nuclear bunker will probably be ripped apart by the force of the wind.
A person rubs her hands together and they heat up
• kinetic energy
• light energy
• sound energy
• electrical energy
• chemical energy
• heat energy
(multiple choice)
Answer:
Kinetic and heat energy (heat as thermal)
Explanation:
The friction of the rubbing builds up the energy, so it cant be the types of energy like light or sound
the ideal mechanical advantage of a pulley system is equal to the
a) distance the load has to move
b) length of the rope
c) number of rope segments supporting the load
d) weight of the object being lifted
Answer: The correct answer is "Number of rope segments supporting the load".
Explanation:
Mechanical advantage: It is defined as the ratio of the force produced by a machine to the force applied on the machine. The ideal mechanical advantage of a machines is mechanical advantage in the absence of friction.
The ideal mechanical advantage of a pulley system is equal to the number of rope segments which is supporting the load. More the rope segments, It is more helpful to do the lifting the work.
It means that less force is needed for this task to complete.
Therefore, the correct option is (C).
What type of magnetism is present in a bar magnet?
A. Superconducting
B. Contact
C. Induced
D. Permanent
Answer:
It is made up of iron, steel or any other ferromagnetic substance or ferromagnetic composite, having permanent magnetic properties. The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.
The type of magnetism present in a bar magnet is permanent. The correct option is D.
What is magnet?A substance which is negative charged at one end and positive charged at another end creating the magnetic field around it.
A bar magnet also has magnetic fields around it. In the presence of magnetic force fields, any magnetic object will be attracted to it.
It is made up of iron or steel or any other ferromagnetic substance which have permanent magnet properties.
The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.
So, the type of magnetism present in a bar magnet is permanent.
Thus, the correct option is D.
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How does the valence of the element relate to its chemical activity ?
The amount of electrons inside an atom's outer shell governs the chemical reactivity and ability to bind with other elements, and this relationship between an element's valence and chemical activity can be seen.
What is valency?In chemistry, an element's valence—also called valency—determines the number of other atoms that an atom of the metal can combine with.
The phrase, which was first used in 1868, is used to indicate both the broad power of a combination of elements and its numerical value. For 19th-century chemists, the explanation and systematization of valence presented significant difficulties.
The majority of the work was on developing empirical rules for finding the connotations of the elements because there was no good hypothesis explaining its source.
For 19th-century chemists, the explanation and systematization of valence posed significant difficulties. The majority of the effort was focused on developing empirical guidelines for finding the electron orbitals of the components because there was no good theory for its cause.
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Which diagram represents the charge distribution
The electrocope is a device is used to detect the presence of charges. Image B shows the charge distribution in a neutral electrocope when a negative charge is brought near it
What is an electroscope?An electrocope is a device that is used to detect the presence of charges on the basis of electrostatic induction. The proceess involves bringing a charged body around an electroscope and watching out for the movement of the gold leaf.
The image that shows the charge distribution in a neutral electrocope when a negative charge is brought near it is image B.
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The aurora is caused by high natural currents flowing in:
a)the inosphere
b)the upper clouds
c)outer space
d)the asthenosphere
Answer:
the answer is a)the ionosphere
Explanation:
its the ionosphere because it's the region above the earths atmosphere where particles exist in an ionized state.
Answer:
Your answer to the question is a.) the inosophere.
Explanation:
Which of the organisms listed below can be considered a pest?
a
fungi
b
insects
c
bacteria
d
rodents
e
all of the above
Answer:
d
Explanation:
rodents example the house mouse gnaw and spoil food stored by humans this they are considered as pests
Final answer:
All the listed organisms, including fungi, insects, bacteria, and rodents can be considered pests in various contexts, such as when they cause harm to agriculture, food storage, or health.
Explanation:
When assessing which of the organisms listed can be considered a pest, it is indeed correct to consider all of the above as potential pests. This includes fungi, insects, bacteria, and rodents. For example, fungi can cause diseases in plants (like the stem rust on barley), leading to significant agricultural damage. Insects can also be pests, such as locusts that destroy crops or mosquitoes that spread diseases.
Bacteria are often responsible for food spoilage or plant diseases. Rodents, such as mice and rats, can contaminate food supplies and are known carriers of various diseases. These organisms can all be considered pests depending on the context, such as when they cause harm to human endeavors like agriculture, food storage, or human health.
Which of the following is NOT an appropriate acceleration unit?
A)year/day/mile
B)meter/sec/sec
C)mile/hour/sec
D)centimeter/sec/year
Answer:a
Explanation:
4. What is the charge on the leaves of an electroscope if a negatively charged rod is moved near
the top of the electroscope? *
(10 Points)
A)Positive
B)Neutral
C)Negative
Answer:If you bring a negative object near the electroscope, the electrons in the scope will be repelled toward the leaves, balancing the charge. The leaves will move toward each other.
When the negatively-charged rod is brought close to the electroscope, positive charges are attracted to it and negative charges are repelled away from it.
This is called charging by conduction. Figure 2 (c) Charging by Conduction The negatively charged rod touches the knob on the electroscope. The result is a transfer of electrons from the rod to the knob, making the knob, rod, and gold foil all negative, and making the gold foil deflect from the vertical.
Explanation:
Opposite reaction of Air particles pushed outward against a balloon
Answer:
the balloon deflates
Explanation:
Answer: Balloons and Rockets
The air rushes out of the neck of the balloon. The action of the air rushing from the balloon pushes against the balloon, moving it in the opposite direction. When rocket fuel is burned, hot gases are produced. These gases expand rapidly and are forced out of the back of the rocket.
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Explanation:
Which of the following is NOT part of Earth’s biosphere?
1.Pacific Ocean
2.the Moon
3.Rocky Mountains
4.Cuba
Answer: The moon
Explanation: the moon is not on the earth
Earth's biosphere consists of the Pacific Ocean, Rocky Mountains, and Cuba (country), hence the moon is not part of the biosphere, so option 2 is correct.
What is a biosphere?The biosphere is a relatively narrow layer of the Earth's surface that supports life. It starts a few kilometers up in the atmosphere and ends at the deep ocean vents. The biosphere is a vast ecosystem made up of biotic (living things) and abiotic (nonliving) components, from which living things (biota) get their energy and nutrition.
Earth was a barren planet with shallow seas and a thin band of gases before life appeared there. These gases were primarily carbon dioxide, carbon monoxide, molecular nitrogen, hydrogen sulfide, and water vapor. The planet was hostile and desolate. The lithosphere (rock and soil), hydrosphere (water), and atmosphere make up this entirely inorganic state of Earth, which is known as the geosphere (the air).
Therefore, Earth's biosphere consists of the Pacific Ocean, Rocky Mountains, and Cuba (country).
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Please help on these questions!!!
-- First question . . . first answer choice
-- Second question . . . second answer choice
-- Third question . . . third answer choice
2 Points
Which property will increase if you increase the frequency of an
electromagnetic wave?
O
A. Wavelength
O
B. Shift
O
O
C. Speed
D. Energy
SUBMIT
____ occurs when waves spread out and travel around obstacles or through openings in obstacles.
Answer:
diffraction
Explanation:
As you can see from the figure, sound waves spread out and travel around obstacles. This is called diffraction. It also occurs when waves pass through an opening in an obstacle.
The length of a rope is 5 m. A standing wave on the rope has four nodes. what is the wavelength of the wave
The wavelength of the wave will be 2.5 m.
What is wavelength?The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
The formula for the length of the rope in relation to the node and wavelength is given by;
[tex]\rm L= \frac{n}{2} \lambda \\\\ \rm 5= \frac{4}{2} \lambda \\\\ \lambda=\frac{5}{2} \\\\ \lambda= 2.5 \ m[/tex]
Hence the wavelength of the wave will be 2.5 m.
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