When a rock is hanging from a scale, it reads 5 N when it is out of the water and 3 N when it has a density that is 2.5 times that of water.
The substance's mass per unit of volume is known as its density (also known as specific mass or volumetric mass density). Density is most frequently represented by the Greek letter (rho), however, the Latin character D can also be used. Density is mathematically defined as mass divided by volume.
where is the density, m is the mass, and V is the volume. Density is sometimes loosely characterized as weight per unit volume, while this is incorrect scientifically; this quantity is more precisely known as specific weight. An example of this is the oil and gas business in the United States.
The density of a pure substance has the same numerical value as its mass concentration. Density can be important to buoyancy since different materials typically have varied densities.
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A(n) _______ studies physical components and characteristics of celestial objects.
The answer is ASTROPHYSICIST!
Answer:
Astronomers?
Explanation:
Answer:
Astrophysicist?
Explanation:
Question 1 of 10
How much thermal energy is needed to melt 1.25 kg of water at its melting
point?
Use Q = mass x latent heat of fusion.
Properties of water
Property
Value
Melting point
0°C
Boiling point
100°C
Cliquid
4.18 kJ/(kg.°c)
Latent heat of fusion
333 kJ/kg
Latent heat of vaporization
2260 kJ/kg
The thermal energy needed to melt 1.25 kg of water at its melting point is 416.25 kJ.
What is the latent heat of fusion?The latent heat of fusion is the amount of thermal energy required to change the phase of a substance from a solid to a liquid state without a change in temperature.
When a substance is in a solid state, the molecules are packed closely together and are held in a rigid structure by intermolecular forces. As heat is added to the solid, the temperature of the substance increases until it reaches the melting point, which is the temperature at which the solid starts to change into a liquid.
At the melting point, the added thermal energy is used to break the intermolecular bonds that hold the molecules in the solid structure. The energy absorbed during this process causes the molecules to become less ordered and to move more freely, resulting in a liquid state. However, during the melting process, the temperature of the substance remains constant until all of the solid has melted.
The latent heat of fusion is a property of the substance and is defined as the amount of energy required per unit mass to change the phase from solid to liquid. It is usually measured in units of joules per kilogram (J/kg) or kilojoules per kilogram (kJ/kg).
The latent heat of fusion is an important concept in thermodynamics and is used in many applications, such as the melting of ice, the solidification of molten metals, and the formation of igneous rocks.
Here in the Question,
To calculate the thermal energy needed to melt 1.25 kg of water at its melting point, we can use the formula:
Q = mass x latent heat of fusion
where Q is the thermal energy required, and the latent heat of fusion is the amount of energy required to change the phase of a substance from solid to liquid without changing its temperature.
Substituting the given values, we get:
Q = 1.25 kg x 333 kJ/kg
Q = 416.25 kJ
Therefore, 1.25 kilogram of water requires 416.25 kJ of thermal energy to melt at its melting point.
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which element on the periodic table has the largest atomic number?
Answer:
Oganesson
Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope 294Og have been detected.
Explanation:
like a galvanometer an electric motor contains _______ that is free to rotate between the poles of a permanent fixed magnet
Like a galvanometer, an electric motor contains an essential component known as an armature that is free to rotate between the poles of a permanent fixed magnet.
The armature consists of a coil of wire wound around a core made of a ferromagnetic material such as iron. When an electric current passes through the coil, it generates a magnetic field around it, interacting with the fixed magnet's field.
The interaction between the magnetic fields causes a rotational force or torque on the armature, making it rotate. The armature is mounted on an axle or shaft, and this rotational motion is transferred to a mechanical load or system, enabling the motor to perform useful work.
To ensure continuous rotation, the motor employs a commutator, which is a segmented metallic ring connected to the armature coil. Carbon brushes come into contact with the commutator, supplying current to different segments of the coil as it rotates.
This switching of electrical connections ensures that the magnetic forces on the armature continuously change, producing a rotating motion.
Overall, an electric motor utilizes the principles of electromagnetism to convert electrical energy into mechanical energy through the rotational movement of the armature.
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The least common denominator of 1/2, 1/6, and 1/9
A spring has a spring constant of 100 N/m , and the mass hanging on it is 0.50 kg. What is the period of the spring's motion?
Answer:
0.44 sec
Explanation:
k = 100 N/m, m = 0.50 kg
Period
Light striking a metal surface causes electrons to be emitted from the metal via the photoelectric effect.
The intensity of the incident light and the temperature of the metal are held constant. Assuming that the initial light incident on the metal surface causes electrons to be ejected from the metal, what happens if the frequency of the incident light is increased?
If the frequency of the incident light on a metal surface is increased while keeping the intensity and temperature constant, the kinetic energy of the emitted electrons will increase.
The photoelectric effect states that when light of sufficient frequency (above the threshold frequency) strikes a metal surface, electrons are emitted. The energy of a photon is given by the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the light.
The energy of the emitted electron is equal to the energy of the incident photon minus the work function of the metal (Φ), which represents the energy required to remove an electron from the metal surface. So, the equation becomes E = hf - Φ.
As the frequency of the incident light increases, the energy of each photon increases. Therefore, the kinetic energy of the emitted electrons will increase as well.
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Which of the following is an English system unit of measure?
O A. meter
B. mile
O C. gram
OD. liter
describe momentum with examples
Answer:
Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving. An example of momentum is how quickly a car is moving down a hill.
Larvae and pupae normally float. They must use their muscles in order to dive down through water. What type of energy is used by the muscles?
O Sound energy from the air
O Thermal energy from the water
O Chemical potential energy from their cells
O Gravitational potential energy from Earth
The type of energy used by the muscles of larvae and pupae to dive down through water is chemical potential energy from their cells. When the muscles contract, the chemical energy stored in the cells is converted into mechanical work, which allows the larvae and pupae to move through the water. Since Larvae and pupae have muscles that allow them to move through the water. When these muscles contract, they convert the stored chemical energy in their cells into mechanical work, which allows the larvae and pupae to move through the water. This is an example of how chemical potential energy can be converted into kinetic energy, which is the energy of motion. Therefore, the type of energy used by the muscles of larvae and pupae to dive down through water is chemical potential energy from their cells.
Emily drives her car
293.8 km with a
constant speed of
82 km/h and another
194.4 km with a
constant speed of
48 km/h. How much
time in total does she
take to travel these
distances?
Answer:
Since there is already an answer i will try to go more into depth about how it was solved.
Explanation:
Using the basic equation S=d/t, where S is speed is in km/hr, d is distance in km, and t is time in hours, we can plug in the two separate pairs of known variables.
Pair 1:
S=d/t
82km/hr=293.8km/t
t=3.583hr
Pair 2:
S=d/t
48km/hr=194.4km/t
t=4.05hr
since the question is asking us for the total time, we can add these two together.
3.583hr+4.050hr=7.633hr
So she has traveled for a total of 7.633 hours
Hope this helps you understand the question a little more!
Alannah added a strip of zinc to a beaker containing a solution of copper
sulfate, as shown in the photo. She expected to observe the immediate
formation of solid copper in the beaker but saw no evidence of a reaction.
Alannah predicted that the reaction was happening too slowly to observe.
Which statement could best explain this result?
The solution of copper sulfate was too cold
Explanation:
The lack of an observable reaction when adding a zinc strip to a copper sulfate solution could be due to the zinc not being reactive enough, the reaction occurring too slowly, or an experimental error.
What is the lack of an observable reaction?The lack of an observable reaction refers to a situation where no visible or measurable change occurs when two or more substances are mixed or brought into contact with each other, even though a reaction was expected based on the chemical properties of the substances involved.
Here in the Question,
The lack of an observable reaction when Alannah added a strip of zinc to a beaker containing a solution of copper sulfate could be due to the following reasons:
Zinc and copper sulfate do not react: It is possible that the zinc strip and copper sulfate solution do not react with each other, leading to no observable change. This could occur if the zinc strip is not reactive enough to displace the copper in the copper sulfate solution.
Reaction is slow: Another possibility is that the reaction between zinc and copper sulfate is occurring but is happening too slowly to be observed. In this case, the reaction rate may be too low to produce an observable amount of solid copper in the beaker in a short period of time.
Experimental error: It is also possible that an error was made during the experiment that prevented the expected reaction from occurring. For example, the concentration of the copper sulfate solution may have been too low, or the zinc strip may have been coated with a layer of oxide that prevented it from reacting with the solution.
Therefore, Zinc may not be sufficiently reactive, the reaction may proceed too slowly, or there may have been a mistake in the experiment if there was no detectable reaction when a zinc strip was added to a copper sulphate solution.
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the property of volume is a measure of
Answer: How much space an object occupies
Which of these choices is a physical property that does not change when the size of the sample changes
Answer:
An intensive property is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties include temperature, refractive index, density, and hardness of an object.
What is the gravitational attraction between two objects of mass of five million kg (5.0 x 10^6) at a distance of 100 meters from each other? Estimate G as 6.67 x 10^-11 N (m/kg)
Answer:
G = 6.67
Explanation:
When light of frequency 3 × 10&14 Hz travels through a transparent material, the wavelength of the light in the material is 600 nm.
What is the index of refraction of this material?
Group of answer choices
6/5
5/4
5/3
10/9
3/2
The index of refraction of the transparent material where light has a wavelength of 600 nm and a frequency of 3 × 10¹⁴ Hz is 5/3. The correct option is 5/3.
To find the index of refraction (n) of a material, we can use the formula:
n = c / v
Where c is the speed of light in vacuum and v is the speed of light in the material.
Frequency of light, f = 3 × 10¹⁴ Hz
Wavelength of light in the material, λ = 600 nm = 600 × 10⁻⁹ m
The speed of light in vacuum is a constant, approximately 3 × 10⁸ m/s.
To find the speed of light in the material, we can use the formula:
v = f * λ
Substituting the given values:
v = (3 × 10¹⁴ Hz) * (600 × 10⁻⁹ m)
Calculating the value of v:
v = 1.8 × 10⁸ m/s
Now we can find the index of refraction:
n = c / v
n = (3 × 10⁸ m/s) / (1.8 × 10⁸ m/s)
Simplifying the expression:
n = 1.67
Among the given answer choices, the closest value to the calculated index of refraction is 5/3.
Therefore, the correct answer is 5/3.
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Adam is studying forces in the lab. If he applies an unbalanced force to an object, what could happen?
A. Only the object's speed can change.
B. Only the object's direction can change.
C. Neither the object's speed nor direction can change.
D. The object's speed, direction, or both can change.
Neither the object's speed nor direction can change
Answer:
D. The object's speed, direction, or both can change.
Explanation:
If Adam applies an unbalanced force to an object, the object's speed, direction, or both can change. This is because an unbalanced force causes an acceleration, which can result in changes in both speed and direction.
Let's consider some examples to better understand this concept. Imagine Adam pushes a book on a table with a greater force in one direction. If the force is greater than the friction between the book and the table, the book will start moving in the direction of the force. This change in direction is caused by the unbalanced force applied by Adam.
Now, let's say Adam applies a constant force to a ball on the ground. If the force is greater than the friction between the ball and the ground, the ball will start rolling and its speed will increase. Again, this change in speed is due to the unbalanced force applied by Adam.
In summary, when an unbalanced force is applied to an object, it can cause changes in the object's speed, direction, or both. So, the correct answer is D: The object's speed, direction, or both can change.
A 10cm3 sample of copper has a density of 897g/cm3. What is the mass of the sample?
A 10cm³ sample of copper has a density of 897g/cm³. What is the mass of the sample ?
Answer:-Given:-Density of sample of copper is 897g/cm³.
Volume of sample of copper is 10cm³.
To Find:-The mass of the sample.
Solution:-We know,
\( { \boxed{\bf{\rm \red {Mass \: = \: Density \: × \: Volume}}}} \)
So, Mass = 897g/cm³ × 10cm³
Mass = 8970 g
The mass of the sample is 8970 g. [Answer]true or false
As the moon orbits Earth, the absolute positions of the moon,
Earth, and the sun change
Answer:
FALSE
Explanation:
as the moon orbits earth, the ABSOLUTE position of the moon, earth, and the sun change. the moons orbit around earth is ABSOLUTELY STRAIGHT with respect to earths orbit around the sun. the amount of the moon's surface that is lit by the sun changes.If Calcium has 2 valence electrons and Chlorine has 7 valence electrons, how many Cl-1 ions would need to combine with 1 Ca+2 ion?
Answer:
CALCIUM IDENINE ADEININE AND PHOSPHATE
Explanation:
what is the wavelength of a beam of light having a frequency of 6 × 1017 hz?
The wavelength of the light beam having a frequency of 6 × 1017 hz is 0.05 nm.
To calculate the wavelength of a light beam, we can use the formula:
λ = c/f
Where λ is the wavelength, c is the speed of light and f is the frequency of the light.
The speed of light is approximately 3 x 10^8 m/s, we can use this value to find the wavelength.
λ = c/f
λ = (3 x 10^8 m/s) / (6 x 10^17 Hz)
λ = 0.05 nm
So the wavelength of the light beam is 0.05 nm.
It's important to mention that the wavelength is inversely proportional to the frequency, meaning if the frequency is high the wavelength is short and if the frequency is low the wavelength is long.
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if you will be a science what would you be and how it will benefit the human race?
Answer:
In other words, science is one of the most important channels of knowledge. It has a specific role, as well as a variety of functions for the benefit of our society: creating new knowledge, improving education, and increasing the quality of our lives. Science must respond to societal needs and global challenges.
David drove the first 6 hours of his journey at 65 km/hour and the last 3 hours of his journey at 80 km/hour. How far is the whole journey in Km?
David traveled a total distance of 630 km.
distance = speed × time
Let's first calculate the distance he traveled during the first 6 hours at a speed of 65 km/hour:
distance1 = speed1 × time1
distance1 = 65 km/hour × 6 hours
distance1 = 390 km
Now, let's calculate the distance he traveled during the last 3 hours at a speed of 80 km/hour:
distance2 = speed2 × time2
distance2 = 80 km/hour × 3 hours
distance2 = 240 km
To find the total distance of the journey, we can add the two distances:
total distance = distance1 + distance2
total distance = 390 km + 240 km = 630km.
Distance is a measurement of the amount of space between two points or objects. It is a fundamental concept in mathematics and physics that is used to describe the extent of separation between two or more entities in a three-dimensional space. Distance can be expressed in a variety of units, including meters, kilometers, miles, feet, and inches, among others.
In physics, distance is an essential parameter for describing the movement of objects. It is used to calculate speed, velocity, and acceleration, which are all fundamental concepts in physics. In addition, distance is also used in the field of astronomy to describe the vast distances between celestial objects such as stars, planets, and galaxies.
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what is the weight of a 45kg box
____ N
The weight of a \(45 kg\) box is \(441.45 N\).
Weight refers to the measure of the force exerted on an object due to the gravitational pull of the Earth.
Given the mass of the box is \(m=45 kg\).
The weight of an object (\(W\)) can be found by multiplying the mass of the object (\(m\)) by the acceleration due to gravity (\(g\)).
So, \(W=mg\).
It is known that acceleration due to gravity, \(g=9.81 m/s^2\).
Hence, the weight of the box, \(W=(45kg)\times (9.81 m/s^2)\).
\(\Rightarrow W=441.45 (kg\cdot m/s^2)\\\Rightarrow W=441.45 N\)
Therefore, the weight of the box is \(441.45 N\).
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the bolts on a car wheel require tightening to a torque of 90 nm. if a 30 cm long wrench is used, what is the magnitude of the force required when the force applied at 53 degrees to the wrench?
To resolve the issue, we'll apply the moments' principle. According to the question, the wrench must exert 90 Nm of torque on the bolt. The angle at which the force acts (53o to the wrench) and the length of the lever arm (30 cm) are provided.
Before moving on to the computations themselves, a conversion. The wrench's length is specified in centimeters, which must be converted to meters:
30cm=30×10−2m=0.30m
Get an expression for the vertical component of the force now using trigonometry. The equation is Fv=Fsin53 since the vertical component is the reverse of the 53o angle.
The vertical component of the force is multiplied by the lever arm to produce the moment of the force (0.30 m).Keep in mind that the force must produce a 90 Nm torque, which I will enter on the left-hand side of the equation.
Calculation:
\s90=Fv⋅0.30=Fsin53⋅0.30
F=90sin530.30=375 N=376N, rearrange for F, and solve.
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The Moon does not crash into Earth because: its in Earth's gravitational field the net force on it is zero it is beyond the main pull of Earth's gravity its being pulled by the Sun as well as by Earth none of the above
It is freely falling but it has a high tangential velocity.
The correct answer is D.
Is the net force on the moon zero?
There cannot be zero net force acting on the Moon. There will be no circular orbit since there will be no net force acting on the Moon. The motion will be carried out by the Moon.
Why does the moon not have a gravitational pull?
The gravity at the Moon's surface is about 1/6th as strong as that at Earth, or 1.6 meters per second every second. The Moon's surface gravity is weaker because it has a smaller mass than Earth. The gravity at the Moon's surface is about 1/6th as strong as that at Earth, or 1.6 meters per second every second.
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I understand that the question you are looking for is
The Moon does not crash into the Earth because:
(a) the net force on it is zero.
(b) it is beyond the main pull of the Earth's gravity.
(c) it is being pulled by the Sun as well as by the Earth.
(d) it is freely falling but it has a high tangential velocity.
(iii) A car of mass 2000kg moves with an initial velocity of 40km/h and attain a final velocity of 120km/h which was maintained for a given distance. Calculate the impulse of the car.
160000 kgm/s is the impulse of the car.
J=mΔv
I= impulse
m= mass= 2000kg
Δv= change in velocity= 80 km
J=mΔv
I= 2000kg×80 km/s
I=160000 kgm/s
The concept of impulse is used to describe how a net force affects an item (a kind of "moving force"). Impulse is denoted by the letter J. The average net force acting on an item over time is calculated as an impulse. The force-time integral is J = Ft. The vector quantity of impulse is J = F dt (since force is a vector and time is a scalar).
Theorem of Impulse-Momentum According to the impulse-momentum theorem, an object's change in momentum equals the impulse that was delivered to it. J = ∆p The newton second is the SI unit for impulse. The kilogram meter per second is the SI unit for momentum. These momentum and impulse units are the same.
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what optical effect is essential to the visual experience of motion pictures?
The optical effect that is essential to the visual experience of motion pictures is known as Persistence of Vision.
Persistence of Vision (POV) is a phenomenon of the eye where an image or object is perceived by the brain for a short period of time after the image or object has been removed from the viewer's sight. The phenomenon occurs because of the retina's temporary retention of visual images even after they have been seen.
The Persistence of Vision enables the human eye to perceive the illusion of motion when viewing a series of still images in rapid succession. This effect is the foundation for the creation of motion pictures. In films, a sequence of still images is displayed in rapid succession (typically at a rate of 24 frames per second) that simulates motion to the human eye, tricking it into believing that the images are moving in a fluid and natural way.
POV is an essential aspect of the visual experience of motion pictures as it allows filmmakers to create an illusion of motion using a series of still images. The human eye is capable of retaining images for a short period of time after they have disappeared from the field of vision, which makes this effect possible.
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in the figure the battery has a potential difference f V = 10.0 V and the five capacitors each have a capacitance of 7.90 μF. What is the charge on a. capacitor 1 and b. capacitor 2?
The charge on capacitor 2 is 79 μC.
Hence, the charge on capacitor 1 is 79 μC, and the charge on capacitor 2 is 79 μC.
In the figure the battery has a potential difference fV= 10.0 V, and the five capacitors each have a capacitance of 7.90 μF. To find the charge on capacitor 1 and capacitor 2, we can use the formula Q=CV, where Q is the charge, C is the capacitance, and V is the potential difference. Let's first find the equivalent capacitance of the circuit using the formula Ceq = C1 + C2 + C3 + C4 + C5.
Given values are, fV = 10.0 V and C = 7.90 μF.
Therefore, total capacitance,
Ceq = C1 + C2 + C3 + C4 + C5
Ceq = 7.90 μF + 7.90 μF + 7.90 μF + 7.90 μF + 7.90 μF
Ceq = 39.5 μF
Now, the potential difference across each capacitor is fV = 10.0 V.
a. To find the charge on capacitor 1, we can use the formula Q = CV.
Therefore, Q1 = C1V
Q1 = 7.90 μF x 10.0 V
Q1 = 79 μC
Therefore, the charge on capacitor 1 is 79 μC.
b. To find the charge on capacitor 2, we can use the same formula Q = CV.
Therefore, Q2 = C2V
Q2 = 7.90 μF x 10.0 V
Q2 = 79 μC
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which car has the most kinetic energy ??
A. a car mass 1400 kg with speed 4 m/s
B. a car mass 1300 kg with speed 3 m/s
C. a car mass 1500 kg with speed 5 m/s
D. a car mass 1200 kg with speed 2 m/s
it's C
because the faster an object moves the more kinetic energy it has.