Answer:
c = 0.6 J/g°C
Explanation:
Heat is given by the formula;
Heat = mass× specific heat capacity × change in temperature
Mass = 455 g
Heat = 1638 J
ΔT = 6 °C
Therefore;
1638 J = 455 g× c × 6
c = 1638/(455×6)
c = 0.6 J/g°C
Which of the subatomic particles determine the mass of an atom?
Answer:
The number of proton and neutrons.
Explanation:
The mass of an atom is concentrated in the tiny nucleus. Protons and neutrons are massive particles while the mass of electrons are negligible.
It is a common thing to relatively compare the mass of these particles.
If the mass of proton is 1 unit
The mass of neutron would be 1 unit
The mass of electrons would be 1/1840 unit.
We see that electrons have very small mass or negligible mass compared to the neuleons.
This is why when calculating the mass number, we sum the number of protons and neutrons alone.
What do radio waves and microwaves have in common
Answer:
they are very common
Explanation:
What do radio waves and microwaves have in common?
Both have lower radiant energy than visible light.
Both have higher frequencies than visible light.
Both are located to the right of visible light on the spectrum.
Both have longer wavelengths than visible light.
Answer:
Both are at the side of the spectrum that has the lowest frequency
Explanation:
If electromagnetic waves are arranged in the order of the energy from highest to lowest energy range then we will have
1). Gamma rays
2) X rays
3) Ultraviolet rays
4) Visible light
5) Infrared waves
6) Microwaves
7) Radio waves
Now as per energy range we can say that both microwaves as well as radio waves must have small energy range and longer wavelength as compare to visible light.
SO correct answer is
Both are at the side of the spectrum that has the lowest frequency
Which balances the equation Mg + O2 — MgO?
Answer:it’s c
Explanation:
I got it right on the test
Which is the best example of natural selection
Answer:
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
Explanation:
Gravity anything with mass as gravity we know the earth has gravity because you and I are standing on earth and not floating off into space when we jump we come right back to earth which model best represents the force of gravity pulling us all down to earth?
Answer:
[tex]F=mg[/tex]
Explanation:
Close to Earth's surface, the force of gravity that pulls an object towards the ground is
[tex]F=mg[/tex] (2)
where
m is the mass of the object
g is the acceleration due to gravity, which is [tex]9.81 m/s^2[/tex] close to Earth's surface
This is an approximation of the general formula of gravity valid only close to Earth's surface. The more general formula is
[tex]F=G\frac{Mm}{r^2}[/tex] (1)
where
G is the gravitational constant
M is the Earth's mass
m is the object's mass
r is the distance of the object from Earth's center
At the Earth's surface,
r = R (Earth's radius), and by calling the following factor
[tex]g=\frac{GM}{R^2}[/tex]
we see that eq.(1) becomes eq.(2).
the value of efficiency is never 100% or more in practice. why
Answer: Because of presence of friction in most cases as friction exists in ever machine/body, so whenever it works, friction causes heat and sound energy as well, hence, proving that a system cannot be 100% efficient due to friction.
The Ptolemaic model of the universe describes the earth as
A.at the center, but moving relative to the other planets
B. At the center, stationary, with planets that rotate around it
C. Orbiting around the sun with the other planets of our solar system
D. Orbiting the moon, following the path of the sun
The Ptolemaic model of the universe describes the Earth as being at the center, stationary, with the Sun, the Moon, other planets, stars, and EVERYTHING rotating around it. (B)
Answer:
B. At the center, stationary, with planets that rotate around it
Explanation:
The Ptolemaic model is also known as geocentric model. Ptolemy and Aristotle proposed the Earth to be center of the universe and every other body (planets, moons, stars and sun) to be revolving about in concentric orbits. They considered Earth to be stationary. The observation that the sun seemed to revolve about earth every 24 hours and that the observer on the earth cannot sense motion of Earth supported this model.
The of the line on a velocity vs. time graph represents acceleration.
Answer:
True
Explanation:
If you are determining whether the statement is true or false, the answer would be true.
A velocity versus time graph can give information about the acceleration of an object. Acceleration is the change in velocity over time, so the line thatis formed by from different points can tell you whether the object has accelerated, decelerated, or is at a constant velocity.
Velocity is placed on the y-axis, while time is on the x-axis. If you see the line or the slope going upwards, this means that the object is accelerating. If the slope is going downwards, this means that the object is decelerating. If the line is parallel to the x-axis then that means the object is at constant velocity.
Answer:
Slope
Explanation:
To get an electrical current you have to have a ___ ____.
Answer :
curcuit and Source of current .
Answer: you have to have a source of electricity because if not you are not gonna get a "eletrical" current
metals can be described as
They tend to be lustrous, ductile, malleable, and good conductors of electricity, while nonmetals are generally brittle (for solid nonmetals), lack lustre, and are insulators.
Your heart has four valves. Normally, these valves open to let blood flow through your heart, and then shut to keep it from flowing backward. Sometimes the valves don't work properly, causing some or all of the following disorders. In regurgitation, blood leaks back through the valve in the wrong direction. In valve prolapse, the valves have "floppy" flaps and don't close tightly. It's one of the most common heart valve conditions. Sometimes it causes regurgitation. In stenosis, the valve doesn't open enough and blocks blood flow. Based on your knowledge of the heart, explain how regurgitation, valve prolapse, and stenosis each adversely affects blood flow and the oxygenation of body tissues.
Answer:
It influences blood flow
Answer:
A prolapse is when the valve flaps bulges into the left atrium causing a leak. A prolapse can cause regurgitation. This is when the blood flow is backwards. Stenosis is when the aortic valve is narrowed. This blocks the oxygenated blood flow to the body.
All of these problems effects a proper blood flow and if the flow isn't correct then body tissues that need oxygenated blood won't receive it properly.
PLZ HELP ASAP! TYSM! I WILL AWARD BRAINLIEST!
A track is moving at a fixed speed. FIRST ANSWER THIS QUESTION, If the track moves 30 miles in 25 minutes, find the time it will need to cover 25 miles
THEN, Find the speed of the track AND write a formula that connects D and T. FINALLY, find the coefficient of variation k?
Answer:
im not smart enough, all i figured out is the track is going 1.2 miles every minute
Explanation:
One positive effect of recycling aluminum cans
to manufacture new beverage containers is
(1) conserving Earth’s resources
(2) creating acid rain
(3) warming Earth’s atmosphere
(4) increasing the ozone layer
Your answer should be “1.”
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Recycling aluminum cans conserves Earth's resources by requiring up to 95% less energy than producing new aluminum from bauxite ore. This energy-saving equates to significant conservation of gasoline and reduces harmful greenhouse gas emissions, thus benefiting the environment. Option 1 is correct .
One positive effect of recycling aluminum cans is conserving Earth's resources [ option 1 ] . Recycling is highly beneficial to the environment and is an important aspect of sustainability. When it comes to the recycling of aluminum, it is significantly more energy and resource-efficient compared to extracting and processing new aluminum from ore.
Producing new aluminum from bauxite ore requires temperatures above 900°C and a large amount of electricity. In sharp contrast, recycling aluminum requires up to 95% less energy than producing primary aluminum. This huge energy savings can be equated to the amount of energy in gasoline. For example, recycling just 40 aluminum cans can save the same amount of energy found in one gallon of gasoline. With this simple act, if all the aluminum cans used were to be recycled, it would result in an enormous energy conservation, potentially saving billions of gallons of gasoline each year.
Overall, the process of recycling aluminum not only conserves energy but also reduces the need for raw material extraction, which in turn protects ecosystems from potentially damaging mining operations. As such, recycling aluminum also aids in reducing greenhouse gas emissions, which contributes to mitigating global warming and climate change.
what is the difference between transverse waves and longitudinal waves?
Answer:
What is the difference between Transverse and Longitudinal waves? Transverse Waves: Displacement of the medium is perpendicular to the direction of propagation of the wave. ... Longitudinal Waves: Displacement of the medium is parallel to the direction of propagation of the wave.:
In transverse waves, displacement of the medium is perpendicular to the direction of propagation of the wave while in longitudinal waves, displacement of the medium is parallel to the direction of propagation of the wave.
What is sound wave?A sound wave is a result of compression and rarefaction, by which sound is propagated in a material medium such as air.
A sound wave can't be propagated without medium. Sound doesn't travel in vacuum.
When displacement of the medium is perpendicular to the direction of propagation of the wave is called transverse waves.
When displacement of the medium is parallel to the direction of propagation of the wave is called longitudinal waves.
Thus, the difference is only due to the direction of propagation.
Learn more about sound wave.
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Explain temperature change and process of change on a cooling curve:
Answer:
When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, and thereby its temperature increases. ... From solid to liquid at melting point or from liquid to gas at boiling point) is termed as its latent heat.
Process:
A cooling curve is a line graph that represents the change of phase of matter, typically from a gas to a solid or a liquid to a solid. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to.
The initial point of the graph is the starting temperature of the matter, here noted as the "pouring temperature". When the phase change occurs there is a "thermal arrest", that is the temperature stays constant. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to. The amount of energy required for a phase change is known as latent heat. The "cooling rate" is the slope of the cooling curve at any point.
Which statement describes the energy that a transverse wave carries as its amplitude increases?
It increases and is perpendicular to the motion of the wave.
It decreases and is perpendicular to the motion of the wave.
It increases and is parallel to the motion of the wave.
It decreases and is parallel to the motion of the wave.
Answer:
It increases and is perpendicular to the motion of the wave.
Explanation:
- A transverse wave is a wave in which the oscillation occurs in a direction perpendicular to the motion of the wave (example of transverse waves are electromagnetic waves)
- A longitudinal wave is a wave in which the oscillation occurs in a direction parallel to the motion of the wave (example of longitudinal waves are sound waves)
- The amplitude of a wave is defined as the maximum displacement of the wave relative to the equilibrium position, and the energy carried by the wave is proportional to the square of the amplitude:
[tex]E\propto A^2[/tex]
Therefore, as the amplitude of the wave increases, the energy increases as well.
In order to lift the crate, the forklift had to apply force that was greater than force of gravity affecting the crate.
Answer:
had to apply and upward force that was greater than the downward force of gravity affecting the crate.
Explanation:
Answer:
Explanation:
There are two forces acting on the crate. the upward force which is the tension force and the downward force which the force of gravity. a forklift is to lift the crate upwards. This means that the tension force from the forklift must be greater than the force of gravity else the force of gravity will resist it from moving upward
[OU.04] The picture below shows two galaxies. What of these statements best describes a similarity between the two galaxies?
Answer:
D.
Explanation: Both have shapes determined by gravitational forces.
Answer: Option (D)
Explanation: A galaxy is considered to be a large and extensive body comprised of the interstellar dust particles, dark matter and variable gases. The above mentioned particles are attached with one another forming variable shapes and are all held by the gravitational force. Gravity is the main factor responsible for the existence of this galaxies.
This is the reason, why the different shaped galaxies exist in the vast space, maintaining some similarity with one another.
Thus the correct answer is Option (D).
Lyndon is investigating whether putting plastic on her windows will help seal out cold winter drafts. She covers a window on the south side of her house with plastic and measures the inside temperature near the window. She also measures the inside temperature near a window without plastic on the north side of her house. The windows are the same size and design. Why is this not an ideal controlled investigation? A. The windows should be different sizes to introduce variation. B. The drafts at each window may be different because the windows aren’t near each other. C. Temperature isn’t a good indicator of cold winter drafts. D. Outside temperature is a better indicator of cold winter drafts than inside temperature. E. The type of plastic used in the investigation isn’t mentioned
Answer:
B. The drafts at each window may be different because the windows aren’t near each other.
Explanation:
The measurement is imprecise since the temperature will be lower in the window that receives the draft directly. that is, if the draft comes from the north, the north window will perceive lower temperatures than the south window.
Answer: B
Explanation: PLATO
The police know that the neighbor across from a house where a murder occurred sits on the porch nearly all day and believe he would have seen or heard something the night the murder took place. However, the neighbor doesn’t want to testify. What might the prosecution need to rely on to ultimately get the neighbor to testify?
a warrant
parole
a subpoena
Miranda rights
a subpoena, i think. hope this helps!! :)
Answer:
A subpoena
Explanation:
In this case, the only witness refuses to testify, so the prosecution needs something from a legal resource to compel the witness to talk. There are resources used by the police and the prosecution to make it happen, for example, create a case of obstruction of justice, or justify probable cause of the neighbor involvement in the murder (way more complicated than it sounds), yet the easiest one is a subpoena, that is nothing more than a "document" or written order by a government agency or court, to create an obligation of the witness to give testimony or suffer a penalty, of course, there are complications, since the prosecution has to prove that the neighbor is the only key witness and that he/she was on the porch at that day and time, but that's another story.
Hope this helps
What is a process that returns to its beginning and repeat it self in the same sequence
It is also known as iteration. It is used mostly in computer programming with for and for each loops in which iteration is present. In mathematics there are some "interational operations" like product and sum for eg:
[tex]
J=\sum_{i=1}^{n}J_i\Longrightarrow J_1+J_2+\dots+J_{\infty}
[/tex]
The above equation describes the summation of J alike variables n times.
how are families in perodic table determined
1. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
2. All the members of a family of elements have the same number of valence electrons and similar chemical properties.
3. The horizontal rows on the periodic table are called periods.
The Gulf Stream moves water from near Florida northward across the Atlantic and past northwestern Europe . How does the Gulf Stream affect northwestern Europe
The temperature of the Ocean affects weather conditions. Because the Gulf Stream moves warmer water from the North Atlantic towards Europe they actually have warmer winters than other areas do.
What is a statement that summarizes a pattern found in nature?
Answer:
A scientific law is a statement that summarizes a pattern found in nature.
Explanation:
Answer:
The correct answer will be- scientific law
Explanation:
The pattern that exists in nature appears as the regularities which can be recorded and descriptive through observations. These pattern of nature while recording can be modelled in a mathematical expression.
These patterns which can be expressed in the mathematical terms form the scientific laws which hold true everywhere in the universe. The scientific law once formed never changes.
Thus, a scientific law is the correct answer.
Addition of _____________ to pure water causes the least increase in conductivity. A) weak bases B) acetic acid C) ionic compounds D) organic molecules
Answer:
D
Explanation:
Water in itself is a bad conductor of electricity. Any compound that dissociates in water into ions and charged molecules, will increase conductivity of water. In this case ionic compounds weak basis and acids will put in free ions into the water. The ions can pass electricity because they are attracted to respective poles of electricity depending on their charges. In water, these ions are free moving unlike when they are immobilized in their lattice in solid form.
Organic compounds are mainly made of covalent bonds (around carbon) hence do not dissociate in water.
Answer:
the answer is c
Explanation:
i just took it on usatp and its c
which of these is an example of a biotic factor that could affect the size of a population A-climate b-disease c-a natural disaster d-water availability
Hey there!
Biotic factors are living organisms. This includes plants, animals, and bacteria. Climate, water, and natural disasters are abiotic factors, which means they are nonliving factors that affect the environment. Disease is caused by bacteria, which is a biotic factor.
Therefore, your answer is B) Disease.
Hope this helps!
The more _________ an electron has, the further away it can be from the nucleus. mass
Answer:
ectron's further from the nucleus are held more weakly by the nucleus, and thus can be removed by spending less energy. Hence we say they have higher energy. The Coulomb interaction energy between a nucleus of atomic number and an ele
Answer: the more energy
Explanation:
15 POINTS! What is the function of the nervous system? What is the basic unit of the nervous system?
The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.
The somatic system consists of nerves that connect the brain and spinal cord with muscles and sensory receptors in the skin.
The basic unit of the nervous system is the "nerve cell," called "neuron
Answer:
Sample Response: The nervous system helps the body to respond to internal and external stimuli. Sometimes the stimuli can be dangerous so the nervous system also protects the body. The basic unit of the nervous system is the neuron.
Explanation:
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CaCO3 is a compound found in cement. Which of the following elements are in CaCO3? calcium carbon oxygen nitrogen copper
Answer:
CaCo3 contains carbon, oxygen and calcium.
Explanation:
Calcium carbonate (CaCO3) is a compound made up of calcium, carbon, and oxygen in a 1:1:3 ratio. It consists of a metal (calcium) and nonmetals (carbon and oxygen), and is an example of an inorganic compound commonly found in materials like cement.
Explanation:The compound calcium carbonate is represented by the formula CaCO3. It is a compound, not an element, because it is made up of more than one type of atom chemically bonded together. The elements found in this compound are calcium, carbon, and oxygen.
In the chemical formula of calcium carbonate, the ratio of calcium (Ca) to carbon (C) to oxygen (O) atoms is 1:1:3, indicating that there is one calcium atom, one carbon atom, and three oxygen atoms.
The names of these substances are as follows:
a. Calcium, magnesium, iron, and carbon - these elements are all individual pure substances which aren't bonded with others in this context.b. Oxygen, calcium, iron, and nitrogen - Like 'a', these are elements.c. Sodium (Na), chloride (Cl), carbon (C), and hydrogen (H) - Found in sodium chloride (table salt), carbon compounds, and water, respectively.d. Oxygen (O), carbon (C), hydrogen (H), and nitrogen (N) - These are elements involved in various organic and inorganic compounds.The names of the compounds listed are:
a. Hydrogen cyanide (HCN)b. Carbon dioxide (CO2)c. Sodium carbonate (Na2CO3)d. Ammonium hydroxide (NH4OH)e. Barium sulphate (BaSO4)f. Copper (II) nitrate (Cu(NO3)2)Inorganic compounds often consist of a metal and nonmetals. For instance, calcium carbonate involves the metal calcium and the nonmetals carbon and oxygen.
The compound names for the given chemical formulas are:
Na2O - Sodium oxideCdS - Cadmium sulfideMg3N2 - Magnesium nitrideCa3P2 - Calcium phosphideAl4C3 - Aluminum carbideA train traveling at 18.2 m/s accelerates to 39.9 m/s over a distance of 1250 m. How long did it take the train to cover this distance?
Answer:
43.4 s
Explanation:
First of all, we can find the acceleration of the train by using the equation:
[tex]v^2 -u^2 = 2ad[/tex]
where
v = 39.9 m/s is the final speed
u = 18.2 m/s is the initial speed
a is the acceleration
d = 1250 m is the distance covered
Solving for a,
[tex]a=\frac{v^2-u^2}{2d}=\frac{(39.9 m/s)^2-(18.2 m/s)^2}{2(1250 m)}=0.50 m/s^2[/tex]
And now we can fidn the time taken, by using the formula:
[tex]a=\frac{v-u}{t}\\t=\frac{v-u}{a}=\frac{39.9 m/s-18.2 m/s}{0.50 m/s^2}=43.4 s[/tex]