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 carbideIf the given wave has a frequency of 100 Hz, what frequency will the sixth harmonic have?
Answer:
600Hz
Explanation:
In electrical systems of alternating current, the harmonics are, as in acoustics, frequencies multiples of the fundamental working frequency of the system and whose amplitude decreases as the multiple increases. For example, if we have systems fed by the 50 Hz network, harmonics of 100, 150, 200, etc. may appear.
In our case having a fundamental wave of 100Hz, I can have harmonics of 200,300,400, ..., 600Hz
An ecologist studies a forest area for evidence of competition among organisms. She chooses a specific location where a tree was struck by lightning. The lightning strike caused the tree to fall over, leaving a space in the tree canopy for light to pass through. Which of these observations provides the best evidence of competition?
Many tree seedlings crowd the open space and attempt to grow in the sunlight.
Snakes come into the open space and eat small rodents that can easily be spotted in the sunlight.
Termites, with microorganisms in their stomachs to help them digest wood, are found on the fallen tree.
A type of plant, called a bromeliad, grows in the branches of the fallen tree and continues to survive even though the tree has fallen
Answer:
Many tree seedlings crowd the open space and attempt to grow in the sunlight.
Answer:
A
Explanation:
Many tree seedlings crowd the open space and attempt to grown in the sunlight.
When you push a child on a swing, you are doing work on the child because _____.
A. you are pushing against the force of gravity
B. you are allowing the child to continue swinging
C. the child is moving at a constant velocity
D. the child is moving in the direction you are pushing
ur answer is A or also known as
When you push a child on a swing, you are doing work on the child because you are pushing against the force of gravity
hope this helps :)
Thinking it’s A! Sorry if I’m wrong! :)
assuming the earth to be uniform sphere of radius 6400km .calculate the Total energy need to raise a satellite of mass 2000kg to a height of 800km above the surface of the earth and to set it into circular orbit at that their altitude.
Answer:
6.922 × 10¹⁰ J.
Explanation:
The satellite is much smaller than the earth and can be treated as a point mass.
GPE of the SatelliteConsider the equation for the gravitational potential energy of a point mass at a certain distance away from the center of a spherical mass:
[tex]\displaystyle \text{GPE} = -\frac{G \cdot M \cdot m}{r}[/tex],
where
The gravitational constant [tex]G \approx 6.67\times 10^{-11}\;\textbf{m}^{3}\cdot \textbf{kg}^{-1}\cdot \text{s}^{-2}[/tex],[tex]M[/tex] the mass of the sphere (the earth in this case,) [tex]m[/tex] the mass of the satellite, and [tex]r[/tex] is the separation between the point mass and the center of the sphere.As a side note, the GPE here is the same as the work that an external force will do when it brings the point mass from infinitely far away to the current point in space. Gravity pulls the object inwards; the external force acts against gravity in the opposite direction of travel. Energy will be released. The work of the external force will be negative. Hence, the value of GPE shall be either zero (at infinitely far away) or negative.
Convert all values to SI units:
Mass of the earth: [tex]M = 5.972\times 10^{24}\;\textbf{kg}[/tex];Mass of the satellite: [tex]m = 2.000\times 10^{3}\;\textbf{kg}[/tex];Initial separation: [tex]r_{\text{Initial}} = 6400 \;\text{km} = 6.400\times 10^{6}\;\textbf{m}[/tex]; Final separation: [tex]r_{\text{Final}} = 6400 \;\text{km} + 800\;\text{km} = 7200\;\text{km} = 7.200\times 10^{6}\;\textbf{m}[/tex]. Note the the radius of the orbit is the the distance between the satellite and the ground plus the radius of the planet.Initial GPE of the satellite:
[tex]\displaystyle \begin{aligned}\text{GPE(Initial)} &= -\frac{G \cdot M \cdot m}{r_{\text{Initial}}}\\ &=-\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})\times (2.000\times 10^{3})}{6.400\times 10^{6}} \\ &= -1.245\times 10^{11}\;\text{J}\end{aligned}[/tex].
Final GPE of the satellite:
[tex]\displaystyle \begin{aligned}\text{GPE(Final)} &= -\frac{G \cdot M \cdot m}{r_{\text{Final}}}\\ &=-\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})\times (2.000\times 10^{3})}{7.200\times 10^{6}} \\ &= -1.106\times 10^{11}\;\text{J}\end{aligned}[/tex].
KE of the SatelliteGravity is the only force that act on the satellite. The velocity [tex]v[/tex] of the satellite in this orbit depends on the size of the net force on the satellite, which is the same as gravity on the satellite. In other words,
[tex]\displaystyle \frac{m\cdot v^{2}}{r} = \Sigma F = W = \frac{G\cdot M\cdot m}{r^{2}}[/tex],
where again, [tex]r = 6400 + 800 = 7200\;\text{km} = 7.200\times 10^{6}\;\text{m}[/tex].
Rearranging gives:
[tex]\displaystyle v^{2} = \frac{G\cdot M}{r}[/tex],
[tex]\displaystyle \begin{aligned} v &= \sqrt{\frac{G\cdot M}{r}} \\ &= \sqrt{\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})}{7.200 \times 10^{6}}} \\ &= 7.438\times 10^{3}\;\text{m}\cdot \text{s}^{-1}\end{aligned}[/tex].
As a result,
[tex]\displaystyle \text{KE} = \frac{1}{2}\; m \cdot v^{2} = \frac{1}{2} \times (2.000\times 10^{3}) \times (7.438\times 10^{3}) = 5.532\times 10^{10} \;\text{J}[/tex].
Energy requiredAssume no energy loss while lifting the satellite into the space. The energy required will be the same as the change in GPE plus the change in KE (Final minus Initial, keep any negative sign.)
[tex]\begin{aligned} \text{Energy Required} &= (\text{Final GPE} - \text{Initial GPE}) + (\text{Final KE} - \text{Initial KE})\\ &=((-1.106\times 10^{11}) - (-1.245\times 10^{11})) + ((5.532\times 10^{10} \;\text{J})) \\&=6.922 \times 10^{10}\;\text{J}\end{aligned}[/tex].
What happens to a falling object when the force of air resistance equals the force of gravity?
Answer:
A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance that is equal to their weight.
Explanation:
Answer:
so its basically termonal velocity
Explanation:
Both images were taken by a space telescope orbiting Earth. What do these images indicate?
A.
Ultraviolet light is more important than visible light in providing all information about the universe.
B.
Visible light is more important than ultraviolet light when attempting to detect changes in hotter stars.
C.
Different kinds of electromagnetic radiation can be used to detect various types of stars.
D.
Different kinds of electromagnetic radiation reach different parts of the Earth.
These images indicate that different kinds of electromagnetic radiation can be used to detect various types of stars. (C)
Choices 'A' and 'B' are absurd. "Important" is a wishy-washy, rubber word. It means different things to different people, and it can even mean different things to the same astronomer at different times, depending on what he's trying to see at that moment.
True or false a magnet is never found in nature
Answer:
False.
Explanation:
Isolated magnetic poles or magnetic monopoles cannot be found in nature.
Request: Please mark me the Brainliest.
A clear reflection of Mount Hood can be seen in Mirror Lake. Surfaces, such as this one, allow for specular reflection. Light can be thought of as a bundle of individual light rays which are traveling parallel to each other. Each individual light ray follows the law of reflection. If the bundle of light rays is incident upon a smooth surface, like Mirror Lake,
Answer:
All the light rays are reflected into the same direction
Explanation:
Reflection occurs when a light ray hits a surface and bounces back at a certain angle.
The law of reflection states that:
- The angle of incidence, the angle of reflection and the normal to the surface all lie in the same plane
- The angle of reflection is equal to the angle of incidence
(where the angle of incidence is the angle between the incident ray and the normal to the surface, while the angle of reflection is the angle between the reflected ray and the normal to the surface)
We have two cases:
- if the surface is completely smooth (such as the Mirror lake), then all the light rays coming from same direction have same angle of incidence, so they are reflected into the same direction, allowing to see a clear image of the object above --> in this case we talk about specular reflection
- if the surface is not 100% smooth, then the light rays coming from same direction do not hit the surface at same angle of incidence, therefore they are reflected into different directions, and it is not possible to observe a clear image of the object above --> in this case we talk about diffuse reflection
The kinetic energy of an object with a mass of 6.8 kg and a velocity of 5.0 m/s is [BLANK] J. (Report the answer to two significant figures.)
The answer is:
The kinetic energy of the object is equal to 85 J.
Why?The kinetic energy involves the speed and the mass of an object in motion. We can calculate the following the work needed to speed an object (kinetic energy) using the equation:
[tex]KineticEnergy=\frac{1}{2}mv^{2}[/tex]
Where,
m, is the mas of the object
v, is the speed of the object.
Now, we are given:
[tex]mass=m=6.8kg\\speed=v=5\frac{m}{s}[/tex]
So, substituting and calculating the kinetic energy of the object, we have:
[tex]KineticEnergy=\frac{1}{2}*6.8kg*(5\frac{m}{s})^{2}[/tex]
[tex]KineticEnergy=\frac{1}{2}*6.8kg*(25\frac{m^{2}}{s^{2}})[/tex]
[tex]KineticEnergy=\frac{1}{2}*170kg\frac{m^{2}}{s^{2}}[/tex]
[tex]KineticEnergy=85kg\frac{m^{2}}{s^{2}}=85J[/tex]
We have that the kinetic energy of the object is equal to 85 J.
Have a nice day!
Answer:
its 85j
Explanation:
just took the test
A ray diagram is shown.
Which letter represents the location of the image produced by the lens?
W
X
Y
Z
Answer:
Z
Explanation:
The figure represented the ray diagrams produced by a convex (converging lens). The image will appear at the point where the purple ray and the orange ray meet, so at point Z.
As we see from the picture, the image will be:
- Real (because it is behind the lens, and it can be projected on a screen)
- Inverted (the image is upside down)
- Larger than the object (we can see it by noticing that the distance between the point of intersection purple-orange ray and the axis is larger than the size of the object)
Answer:
Its X
Explanation:
Whats the answer to this question show in the picture 2 questions
1) Mass is a measure of how much stuff there is. Weight is a measure of the gravitational force on mass
2) It means "a change in..."
Hope this helps :)
A scientist classifies some plants into two groups
Which are MOST LIKELY the names of the groups?
A. trees, ferns
B. seed producers, spore producers
C. deciduous trees, coniferous trees
D. flowering plants, coniferous trees
The most likely names of the plant groups are seed producers and spore producers, corresponding to gymnosperms and angiosperms. These categories reflect the major divisions of vascular plants based on their reproductive strategies, with gymnosperms producing seeds in cones and angiosperms producing seeds in flowers.
Explanation:The most likely names of the groups into which a scientist classifies some plants are seed producers and spore producers. This categorization aligns with the major division of plants into nonvascular and vascular plants, where vascular plants are further divided into seedless and seed plants. Seed plants are subsequently categorized into gymnosperms, which produce seeds in cones and include conifers, and angiosperms, which produce seeds in the ovaries of flowers and include a wide range of flowering plants.
Gymnosperms, like pines, firs, and spruces, are characterized by their needle-like leaves and cone production, whereas angiosperms encompass a broad variety of plants including broadleaved trees, vegetables, grasses, and floral species admired for their blossoms. The distinction between these two groups lies in their reproductive strategies—the presence of cones in gymnosperms and the production of flowers and encased seeds in angiosperms.
Which type of solar radiation is the most powerful?
radio waves
microwaves
gamma rays
X-rays
Answer: Gamma rays
Explanation:
Answer:
Gamma rays are the most powerful
Gamma rays are not necessarily harmful to the planet Earth, but to all the living organisms that inhabit it, as Gamma is a powerful form of radiation.Gamma-rays are produced primarily by four different nuclear reactions: fusion, fission, alpha decay and gamma decayGAMMA RAYS
Gamma-rays are a form of electromagnetic radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Gamma-rays can be used to treat cancer, and gamma-ray bursts are studied by astronomers.
Electromagnetic (EM) radiation is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic spectrum. The spectrum is generally divided into seven regions in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma-rays.
Gamma-rays fall in the range of the EM spectrum above soft X-rays. Gamma-rays have frequencies greater than about 1,018 cycles per second, or hertz (Hz), and wavelengths of less than 100 picometers (pm), or 4 x 10^9 inches. (A picometer is one-trillionth of a meter.)
Gamma-rays and hard X-rays overlap in the EM spectrum, which can make it hard to differentiate them. In some fields, such as astrophysics, an arbitrary line is drawn in the spectrum where rays above a certain wavelength are classified as X-rays and rays with shorter wavelengths are classified as gamma-rays. Both gamma-rays and X-rays have enough energy to cause damage to living tissue, but almost all cosmic gamma-rays are blocked by Earth's atmosphere.
is hydrogen a gas or metal? or both?
Hydrogen is a nonmetal.
At normal room temperature, hydrogen is a gas.
Hope this helps have a noice day
MAY GOD BLESS YOU!!!
Answer:
[tex]\large \boxed{\mathrm{gas}}[/tex]
Explanation:
Hydrogen is a gas at room temperature. Hydrogen has a molecular formula of [tex]\sf H_2[/tex].
Which of the following has the lowest density ? A.mineral water b. Water c. Oxygen d. Salt water
Answer:
c
Explanation:
Mineral water, water, and salt water are all liquid solutions, while oxygen is a gas. Gases are less dense than liquids.
The force of gravity on Mars is 0.38 times the gravity on Earth. The mass of an
object on Earth is 71 kg.
What are the mass and weight of that object on Mars?
A. mass: 71 kg, weight: 710 N
B. mass: 71 kg, weight: 270 N
C. mass: 27 kg, weight: 270 N
D. mass: 27 kg, weight: 103 N
Answer:
the answer is B
Explanation:
because the mass of any object is constant anywhere so the mass of the object on earth =the mass of the object on mars or any other planet=71kgwhile the weight=massxgravity since the gravity on earth=10m/s^2 and the gravity on mars =0.38x10=3.8m/s^2then the weight =71x3.8=269.8"approximately270N"The mass and weight of that object on Mars is .The correct option is
B.
What is force of gravity?The object experiencing an attraction force towards the another body when placed still on any planet.
The mass of an object is constant on any planet.
Mass of the object on earth = mass of the object on mars = 71kg
The weight is the product of the mass and its acceleration due to gravity.
W=m x g
The acceleration due to gravity on Earth is 10m/s², then the acceleration due to gravity on Mars is
0.38 x 10 = 3.8m/s²
The weight of that object on Mars is
W =71 x 3.8
W = 269.8 Newtons
The weight is approximately 270 N.
Thus, The mass and weight of that object on Mars is 71 kg and 270 N. The correct option is B.
Learn more about force on gravity.
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What is magnetism please define it
Hello There!
It's a Property of matter where atoms in an object are aligned into domains
Two long straight wires are parallel to each other and are separated by 78 mm. The current in wire 1 is 3.55 A and the current in wire 2 is 2.75 A. What is the force per unit length between the two wires?
Answer:
[tex]2.5\cdot 10^{-5}N[/tex]
Explanation:
The force per unit length between two current-carrying wires is given by:
[tex]\frac{F}{L}=\frac{\mu_0 I_1 I_2}{2\pi r}[/tex]
where
[tex]\mu_0[/tex] is the vacuum permeability
[tex]I_1, I_2[/tex] are the two currents
r is the separation between the wires
In this problem, we have
[tex]I_1 =3.55 A[/tex] is the current in the first wire
[tex]I_2 = 2.75 A[/tex] is the current in the second wire
[tex]r=78 mm=0.078 m[/tex] is the separation between the wires
Substituting into the equation, we find
[tex]\frac{F}{L}=\frac{(4\pi \cdot 10^{-7} H/m)(3.55 A)(2.75 A)}{2\pi (0.078 m)}=2.5\cdot 10^{-5}N[/tex]
Layers of Earth's Atmosphere
First place the names of the atmospheric layers in their correct positions, then add the other labels in the appropriate layer.
Choices
Almost no molecules
Exosphere
Tropsphere
Contains Life Forms
Mesosphere
very low temps
contains ozone layer
stratosphere
where asteroids burn up
contains weather
themosphere
widely varying temps
Answer:
going to work my way down
Troposphere
contains weather
contains life forms
stratosphere
contains ozone layer
mesosphere
where asteroids burn up
very low temps
thermosphere
widely varying temps
exosphere
almost no molecules
Explanation:
Answer:
Hope this helps!!
1)
Car A has a mass of 1,000 kg and is traveling 60 km/hr. Car B has a mass of 2,000 kg and is traveling 30 km/hr. Compare the kinetic energy of car A with that of car B?
A) equal
B) half as much
C) twice as much
D) four times as much
Answer: C
Explanation:
Calculate EkA -kinetic energy of car A
m=1000kg
Va=16.66 m/s
EkA=m*Va²/2
Eka=(1000kg*277.556m²/s²)/2
Eka=138 777.8 J
Calculate kinetic energy of CarB:
m=2000 kg
Vb=8.33 m/s
Ekb=(m*Vb²)/2
Ekb=(2000kg*69.39m²/s²)/2
Ekb=69 388.9 J
compare Eka with EkB
Eka/Ekb=138 777.8 J/69 388.9
Eka/Ekb=2
The kinetic energy of car A is twice as much as that of car B. This is calculated using the formula for kinetic energy, which is 1/2 * mass * (velocity)^2.
Explanation:To compare the kinetic energy of car A with that of car B, we first need to understand the mathematical formula for kinetic energy, which is 1/2 * mass * (velocity)^2.
Let's calculate for each car:
For car A: kinetic energy = 1/2 * 1000 kg * (60 km/hr)^2 = 1800000 Joules For car B: kinetic energy = 1/2 * 2000 kg * (30 km/hr)^2 = 900000 Joules
Therefore, car A has twice as much kinetic energy as car B.
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A good trend line does NOT do which of the following
A.) is a best-fit line (through the center of the data points)
B.) represents the overall pattern of the data points
C.) connects all the data points (dot-to-dot)
D.) can be used to make predictions
Answer:
C
Explanation:
A good trend line does not connect all the data points (dot-to-dot) but is a best-fit line that represents the overall pattern of the data and can be used for making predictions.
The question asks which of the listed options a good trend line does NOT do. The correct answer is C.) connects all the data points (dot-to-dot). A good trend line is a best-fit line that balances the number of points above and below it, representing the overall pattern of the data points without necessarily passing through all of them. It is used to approximate the average of those points and can be used to make predictions about the data. Connecting all the data points directly, or dot-to-dot, is not a characteristic of a good trend line, as it fails to represent the general trend or pattern in the data accurately.
in which object more force has to be applied to move in between two object of mass 20 kg and other of mass 2 kg placed at rest at the same time?why?
Answer:
the object of mass 20kg
Explanation:
because the force=massxacceleration
and there is a direct relation between force and mass so the more the mass of the object the greater force it will need to accelerate for example if you tried to push a bike it will be easier than trying to push a truck because of the difference between their masses as the objects of less masses require less forces to move
What does stat mean
Answer:immediately
Explanation:
I think its like four words put together
A skateboarder is accelerating forward. How would his acceleration change if he had more mass?
Answer:
If the force remains the same, the acceleration would decrease
Explanation:
According to Newton's second law, the acceleration of an object is given by
[tex]a=\frac{F}{m}[/tex]
where
F is the force applied to the object
m is the mass of the object
As we see from the formula, the acceleration a is inversely proportional to the mass, m. Therefore, if the force F remains constant, this means that if the mass of the skateboarder increases, then the acceleration will decrease.
Answer: His acceleration would decrease
Explanation:
a waves amplitude is 0.5 meters. If the amplitude is increased to 1 metro, how does its energy change
Answer:
The energy becomes 4 times greater.
Explanation:
We know that the energy of a wave is proportional to the square of its amplitude
E ∝ Amplitude^2
Since the original amplitude = 0.5 m
and the new amplitude becomes = 1 m
We are doubling the amplitude. This means that the new energy will be affected by a factor of 4
E_new ∝ (2*Amplitude)^2 =
E_new ∝ 4*(Amplitude)^2
E_new = 4*E
6. What are 3 different evidences of evolution? How is each form used to provide evidence of evolution?
Answer:
Divergent - This type of evolution often occurs when closely related species diversify to new habitats. On a large scale, divergent evolution is responsible for the creation of the current diversity of life on earth from the first living cells. On a smaller scale, it is responsible for the evolution of humans and apes from a common primate ancestor.
Convergent - Convergent evolution causes difficulties in fields of study such as comparative anatomy. Convergent evolution takes place when species of different ancestry begin to share analogous traits because of a shared environment or other selection pressure. For example, whales and fish have some similar characteristics since both had to evolve methods of moving through the same medium: water.
Parallel evolution - Parallel evolution occurs when two species evolve independently of each other, maintaining the same level of similarity. Parallel evolution usually occurs between unrelated species that do not occupy the same or similar niches in a given habitat.
Final answer:
Evidence of biological evolution includes fossil evidence which shows changes in species over time, molecular evidence demonstrating evolutionary relationships through DNA comparisons, and homologous and vestigial structures that indicate common ancestry and the modification of species.
Explanation:
There are multiple lines of evidence that help support the theory of biological evolution. Here are three distinct forms of evidence:
Fossil Evidence: Fossils offer direct evidence of past life forms and their evolution over time. Through the study of fossils, scientists can trace the development of species, observing gradual changes in the morphology of organisms over geological time scales. This is seen in the fossil record of the horse, which shows a series of species each with slight modifications leading to the modern horse.Molecular Evidence: The comparison of DNA and protein sequences among different organisms reveals similarities and differences that reflect their evolutionary relationships. These molecular similarities can be used to construct phylogenetic trees that demonstrate how species are related through common ancestry.Homologous and Vestigial Structures: Homologous structures are body parts in different species that share a common ancestral origin, whereas vestigial structures are body parts that have lost their original function through evolution. These structures provide evidence for common ancestry and evolutionary change.Each form of evidence is used in conjunction with others to paint a comprehensive picture of life's history on Earth, and how organisms have changed and diversified over time
Mass is a measure of weight. True False
Answer:
Mass is a measurement of the amount of matter something contains, while Weight is the measurement of the pull of gravity on an object.
Explanation:
Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale.
Final answer:
Mass is a measure of the amount of matter an object contains and is constant regardless of location, while weight is the gravitational force acting on an object's mass and varies with location. The statement that mass measures weight is false.
Explanation:
Understanding Mass and Weight
The statement 'Mass is a measure of weight' is false. Mass is a measure of the amount of matter an object contains and is independent of its location. It is typically measured in kilograms. Weight, in contrast, is a measure of the force of gravity acting on an object, which can vary depending on where the object is in the universe. Weight is equal to the mass of an object multiplied by the local acceleration due to gravity, and it is measured in newtons or pounds.
Common misconceptions often stem from the interchangeable use of mass and weight in everyday language. However, it's important to recognize that mass is a scalar quantity, which does not change with location, while weight is a vector quantity that does change depending on the gravitational pull at a given location.
For instance, an individual's mass remains consistent whether they are on Earth, the moon, or floating in space, but their weight would differ significantly in each of these locations due to varying gravitational forces.
How much heat in kilojoules has to be removed from 225g of water to lower its temperature from 25.0oC to 10.0oC?
Answer:
14108 J
Explanation:
The heat that has to be removed from the water is given by
[tex]Q=m C_s \Delta T[/tex]
where
m = 225 g is the water mass
[tex]C_s = 4.18 J/gC[/tex] is the specific heat capacity of the water
[tex]\Delta T=10.0 C-25.0 C=-15.0 C[/tex] is the charge in temperature of the water
Substituting into the equation, we find
[tex]Q=(225 g) (4.18 J/gC) (-15.0 C)=-14,108 J[/tex]
and the negative sign means the heat is removed from the system.
Speed that does not change is referred to as ____________________ speed.
Answer:
Constant speed.
Explanation:
Because when the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.
Hope I helped :)
Final answer:
Speed that does not change is referred to as constant speed or uniform speed. It is a scalar quantity, indicating magnitude only, and uniform motion involves maintaining the same velocity, including both speed and direction.
Explanation:
Speed that does not change is referred to as constant speed or uniform speed. When an object is moving at constant speed, it covers equal distances in equal intervals of time regardless of the direction of motion. Speed, being a scalar quantity, is only concerned with magnitude, not the direction of the travel.
Motion at a constant velocity, or uniform motion, means that the position of the object is changing at the same rate over time, and this typically indicates that there are no changes in speed and direction – the velocity is consistent. However, when referring specifically to speed without direction, constant or uniform speed can occur even if the direction changes.
Two charge spears are 20 cm apart and extract an attractive force of 8x10^-9 N on each other. Which will be the force of attraction when the Spheres are moved to 10 cm apart ?
Answer:
3.2 × 10⁻⁸ N.
Explanation:
By Coulomb's Law, the magnitude of the electromagnetic force between two point charges is inversely proportional to the square of their separation, [tex]r[/tex]. In other words,
[tex]\displaystyle \frac{F_1}{F_2} = {\left(\frac{r_2}{r_1}\right)}^{2}[/tex].
Initial electromagnetic force [tex]F_1 = 8\times 10^{-9}\;\text{N}[/tex];Initial Separation [tex]r_1 = 20\;\text{cm}[/tex];Final Separation [tex]r_2 = 10\;\text{cm}[/tex].Final electromagnetic force:
[tex]\displaystyle F_2 = F_1 \cdot \left(\frac{r_2}{r_1}\right)^{2} = 8\times 10^{-9}\times \left( \frac{20}{10}\right)^{2} = 3.2\times 10^{-8}\;\text{N}[/tex].