Answer:
Both objects are packed equally tightly.
Explanation:
For Substance R we have
mass = 10 g
Volume = 22 cubic cm
So we know that density is defined as
[tex]\rho = \frac{m}{V}[/tex]
here we have
[tex]\rho = \frac{10 g}{22 cm^3}[/tex]
[tex]\rho = 0.454 g/cm^3[/tex]
For substance S we have
mass = 25 g
Volume = 55 cubic cm
So we know that density is defined as
[tex]\rho = \frac{m}{V}[/tex]
here we have
[tex]\rho = \frac{25 g}{55 cm^3}[/tex]
[tex]\rho = 0.454 g/cm^3[/tex]
So here both have same density
so correct answer would be
Both objects are packed equally tightly.
Answer:
c
Explanation:
A temperature of 20C is equal to what F
Answer:
20C is equal to 68 F.
When work is done on an object, the object gains energy. Please select the best answer from the choices provided T F
Answer:
True
Explanation:
We are given the following statement which we are to determine if it is true or false:
'When work is done on an object, the object gains energy'.
The above given statement is true. The reason being that the object gains kinetic energy as a work is done on it or in other words, force is applied on it which moves it.
The work done on the object is equal to the kinetic energy gained by the object, given that there are no frictional forces.
When work is done on an object, the object gains energy.
In physics, when work is done on an object, the object gains energy. This is because work is defined as the transfer of energy. When a force is applied to an object and it moves in the direction of the force, work is being done on the object, and it gains energy as a result.
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Which of the following describe an electrical motor? Check all that apply
() Changes electrical energy to mechanical energy.
() Can be powered by a hand crank.
() Uses the interaction between a spinning coil of wire and magnet.
() Is found in many appliances with moving parts like, a vacuum cleaner or a blender.
Don't answer unless you know the answer, please.
An electric motor converts electrical energy into mechanical energy using magnetic fields and current-carrying conductors, is used in appliances with moving parts, and is not powered by a hand crank.
An electric motor is a device that is designed to convert electrical energy into mechanical energy option A. This transformation occurs through the interaction of magnetic fields and current-carrying conductors. The basic operation of an electric motor involves loops of wire within a magnetic field. When an electric current passes through these loops, a torque is exerted on them, which in turn rotates a shaft connected to the motor. Through this process, the electrical energy used to create the current is converted into the mechanical work needed to turn the shaft.
Electric motors are widely used in various applications such as industrial machinery, household appliances like vacuum cleaners or blenders, and many other devices that require moving parts. These motors are based on the principles of magnetic force exerted on the wire loops. However, they are not powered by a hand crank; that is a feature associated with generators, which convert mechanical energy into electrical energy.
Which sections of the heating curve illustrate this process?
Answer:
B followed by D
Explanation:
The heat energy absorbed at B goes into potential energy that breaks the inter-molecular bonds and thus the constant temperature. Once the molecules have gained enough energy they escape the closely bonded structure and thus are free to move in random directions due to high kinetic energy. At this point (part D) an increase in heat energy leads to an increase in the kinetic energy leading to an increase in the temperature.
The heating curve represents five key phases: solid, melting (solid into liquid), liquid, vaporization (liquid to gas), and gas. Each flat line on the graph represents a phase change such as melting or vaporization; smooth inclines show the rise of temperature within each phase. For example, the initial incline and first flat line illustrate the heating and melting of a solid like ice into liquid.
Explanation:
The heating curve consists of five sections which represent different states of matter and changes of state. These include: solid, melting (solid to liquid), liquid, vaporization (liquid to gas), and gas. If we're talking about heating, these transitions happen in that order. For instance, the initial flat line on a heating curve illustrates the process of heating a solid until it reaches its melting point. The second flat line illustrates the process of actually melting the solid into a liquid, and the third line shows the heat of the liquid rising until it boils.
With water as an example, the solid section is ice being heated until it reaches 0 degrees Celsius, at which point we see the first flat line that indicates the ice melting. Once all the ice is melted, we move to the liquid phase where the temperature again rises until it reaches 100 degrees Celsius, indicating boiling and the beginning of the next phase change. This is the liquid to gas transition, shown by the second flat line on the curve.
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Use the drop-down menus to answer each question.
Which line represents the movement of a cart with a constant acceleration?
A
Which line represents the movement of a cart with a constant velocity?
C
Which lines represents a cart with no velocity or acceleration?
B
Answer:
Constant acceleration- A
Constant velocity- C
No velocity or acceleration- B
Explanation:
For body moving with a constant acceleration, the rate of change of displacement changes over time. This is proven by the increasing gradient of the curve (A) against time.
A body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient C.
A stationary body covers no displacement as time elapses. thus the flat line with zero gradient.
Answer:
A
C
B
Explanation:
correct on edge :)
Which part of the table showing the relationship of the field of research to solid-state physics contains an error?
crystallography
electromagnetism
materials science
metallurgy
Answer: (A) Crystallography
Explanation: Edge 2021
Why is no work done when you hold a book in place over your head?
A A force is applied to the book, but there is no movement.
B The book has motion, but no force is applied to it.
C A force is applied to the book, causing it to move.
2 Points
Which of the following objects exhibit two-dimensional motion?
Check all that apply.
A. An object that's thrown horizontally off a cliff and allowed to fall
O
B. An object thrown upward at an angle
O
c. An object dropped from rest
O
D. An object thrown vertically upward
SUBMIT
Answer:
A. An object that's thrown horizontally off a cliff and allowed to fall
B. An object thrown upward at an angle
Explanation:
An object exhibits a two-dimensional motion if it can be described by both x and y coordinate components.This means you can describe it using a vector with the horizontal and vertical components.For example,a graph of a body that moves with a constant velocity,the sum of the velocities in the x and y directions can describe this object's position.The same with kicking a ball.The ball will rise up at an angle, where you will have the horizontal component in the x-axis direction and the vertical component in the y-axis direction.
So for the case of this question, when an object is thrown horizontally, the horizontal component is initiated which will be represented by the x-axis vector.When it is allowed to fall down, the vertical component is initiated, in this case it will be a negative vector.An object thrown upward at an angle behaves like a ball kicked at an angle.
Stereotypes are widely held beliefs that people have certain traits because
Answer:
Stereotypes are widely held beliefs that people have certain traits because they belong to a particular group stereotypes are often in accurate and frequently portray the members of less powerful less controlling groups or negatively and members of more powerful more controlling groups.
Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.
Answer:
The answer is true.
Answer:
Explanation:
It is true that discoveries we always make is based on current knowledge and technology.
These scientific model comes out on the basis of what technology we have in present but it true that their effectiveness gets limited with new discoveries.
For example, the raisin pudding model of atom was a discovery new to that time but with the discovery of new technology that model was not feasible.
The bohr model sets new parameter and adds new information in field of atomic structure.
if a plane crash on border between mexico and america where do they bury the survivors?
Answer: it depends on there orgin and where there records say they shall be buried. For example, if your records say that you want to be buried in this specific location is requried by law to be buried there
Hope this helps :D
What are the theoretical properties of a gas at a temperature of 0 Kelvin?
Answer:
The molecules in the gas would be completely stationary
Explanation:
The temperature of a gas is proportional to the average kinetic energy of its molecules, according to the equation (valid for an ideal monoatomic gas):
[tex]E_k = \frac{3}{2}kT[/tex]
where
[tex]E_k[/tex] is the average kinetic energy of the molecules
k is the Boltzmann constant
T is the absolute temperature of the gas
For a gas at 0 Kelvin, T = 0: this means that the average kinetic energy of the molecules is also zero. But this means that the motion of the molecules has completely stopped, so the molecules are completely still.
Velocity can best be described by which of the following statements?
O
A. The speed of gravity
O
B. How far you have traveled
O
C. Speed in a given direction.
O
D. Miles per second
SUBMIT
The velocity is the “measure of displacement over a given time” which can be best explained with the statement of “speed in a particular direction”.
Answer: Option C
Explanation:
The velocity is the measure of displacement over time whereas the speed is the measure of distance over time. Since displacement is the distance covered in a particular direction, velocity is the measure of speed in a given direction. Velocity is “vector quantity” and speed is scalar quantity.
What makes a person a member of the power elite?
A person becomes a member of the power elite through influential positions in military, corporate, and political institutions, often facilitated by their education from prestigious universities and their wealth. These individuals exert control over critical decisions that affect the economy and policy-making. Their interwoven interests form a tight-knit group that maintains power and has the potential to challenge democratic values and create inequalities.
One becomes a member of the power elite by occupying dominant positions within the most powerful institutions of society, namely the military, corporate, and political sectors. Sociologist C. Wright Mills outlines this concept in his book The Power Elite, describing a small, interconnected group that wields significant influence and resources. These individuals tend to be highly educated, having often graduated from prestigious universities, and use their wealth and connections to control the nation's economy and secure key political positions that allow them to make decisions which benefit themselves or their interests.
According to Mills, the power elite influence or even directly control the decision-making processes of the government in such a way that they can shape policies to favor their positions. This is evident as the power elite often have overlapping roles in different sectors, such as corporate executives becoming political leaders or vice versa, creating a circulating elite that sustains its dominance. The dynamics among the power elite thus have profound implications not only for the United States but also for the global population, as their decisions can benevolently or adversely affect millions.
The influence of the power elite is also bolstered by their control over mass media, which serves as a means of propaganda to maintain their status and agenda. It's important to note, however, that members of this elite are also individuals driven by self-interest, which is a natural human trait. The concern arises when their concentrated political and economic power challenges the principles of democracy and leads to significant socioeconomic inequalities.
The Power Elite theory, as described by sociologist C. Wright Mills, refers to a small group of wealthy and influential individuals who hold dominant positions in society, consisting of government, big business, and the military.
This elite group makes decisions that benefit their own interests rather than those of the general population, often controlling economic and political aspects to maintain their power and influence.
Members of the power elite are typically highly educated, have political connections, and use their positions to influence policies and resource allocation to uphold their dominance within society.
A beam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. If the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? The value of q = -1.6 × 10-19 coulombs.
To calculate the force acting on electrons moving at right angles to a magnetic field, we use the formula F = qvB, considering the given values for the charge of the electron, velocity, and magnetic field strength. The calculated force is -4.68 × 10^-15 Newtons.
Explanation:The question asks for the force acting on electrons moving at right angles to a magnetic field. To find the force, we use the formula F = qvBsin(θ), where F is the force on the charge, q is the charge of the electron (-1.6 × 10-19 coulombs), v is the velocity of the electron (6.5 × 106 meters/second), B is the magnetic field strength (4.5 × 10-2 tesla), and θ is the angle between the velocity and the magnetic field (90 degrees since they are at right angles). Since sin(90°) = 1, the equation simplifies to F = qvB. Plugging in the values, we get F = -1.6 × 10-19 × 6.5 × 106 × 4.5 × 10-2, which calculates to -4.68 × 10-15 Newtons.
An idea, event, or object can be represented by a ____ to help people better understand it.
this should be it hope it helps
The representative model can be used to demonstrate the object or event or an idea to the people making them understand better.
Explanation:
Model representation is the best way to make people understand the idea or the event as verbal listening do not target the sense in much deeper way as the visual effect do.
The people will grasp of the model very easily as they could see it and they are not required to imagine. While imagining the event or the idea, half of the senses are involved in it and let the individual understand less.
A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the Earth’s surface. What has the sound wave most likely encountered? a different kind of rock an underground lake an open cavity a pile of dinosaur bones
Explanation:
In general, sound (mechanical waves) travels faster in solids than in liquids, and faster in liquids than in gases. This is because the speed of the mechanical waves is determined by a relationship between the elastic properties of the medium in which they are propagated and the mass per unit volume of the medium (that is:density).
In other words: The speed of sound varies depending on the medium through which the sound waves travel.
So, if we are told the sound wave initially had a speed of 4,000 m/s and it suddenly decreases to 1,500 m/s, this means the sound waves passed from a solid medium to a liquid medium.
Hence, the correct option is: an underground lake.
Answer:
b
Explanation:
Which of the following is a feature of the color of an object?
A.
It is a subjective experience, based on the frequencies of light waves the eye receives.
B.
It is a subjective experience, based on the amplitude of light waves the eye receives.
C.
It is a characteristic of the object, regardless of the light around it.
D.
It is the same as that of the light an object absorbs.
Answer:
It is a subjective experience, based on the amplitude of light waves the eye receives.
Explanation:
I would think so it might be this..
Two slits are spaced 0.33mm apart. If the angle between the first dark fringe and the central maximum is 0.055º, what is the wavelength of a light falling on these two slits?
Answer:
[tex]6.33\cdot 10^{-7} m[/tex]
Explanation:
The condition for the first minimum (= first dark fringe) in the interference pattern produced by diffraction from a double slit is
[tex]d sin \theta = \frac{\lambda}{2}[/tex]
where
[tex]d=0.33 mm = 0.33\cdot 10^{-3}m[/tex] is the separation between the slits
[tex]\theta=0.055^{\circ}[/tex] is the angle of the first minimum
[tex]\lambda[/tex] is the wavelength
Solving the equation for the wavelength, we find
[tex]\lambda = 2 d sin \theta = 2(0.33\cdot 10^{-3} m)sin 0.055^{\circ}=6.33\cdot 10^{-7} m[/tex]
A ball is thrown horizontally from a cliff at 8m/s .In what direction is the ball moving 2s later?
Answer:
67.8 degrees below horizontal
Explanation:
In order to understand the direction of the ball after a certain time t, we need to find its horizontal and vertical components of the velocity.
- Horizontal component: the horizontal component of the velocity of the ball is constant, since there are no forces acting along this direction. Therefore, its horizontal velocity after t = 2 s is
vx = 8 m/s
- Vertical component: the vertical component of the velocity of the ball is given by
vy = u + at
where
u = 0 is the initial vertical velocity
a = g = -9.8 m/s^2 is the acceleration of gravity
Substituting t = 2s,
vy = 0 + (-9.8 m/s^2)(2s )=-19.6 m/s
where the negative sign indicates it points downward.
So, the direction of the ball (given as angle below the horizontal) is:
[tex]\theta = tan^{-1} (\frac{|v_y|}{v_x})=tan^{-1} (\frac{19.6 m/s}{8 m/s})=67.8^{\circ}[/tex]
The ball is moving in a downward arc but still maintains its original horizontal speed of 8m/s. Two forces are acting on the ball: the initial horizontal velocity and the force of gravity pulling it downwards. These two forces act independently of each other in an ideal scenario with no air resistance.
Explanation:The ball, thrown horizontally from a cliff at 8m/s, will still be moving in a horizontal direction 2 seconds later. There are two forces acting on the ball once it's thrown: the initial horizontal velocity given to it (in this instance, 8m/s), and the force of gravity pulling it downwards. In an ideal scenario with no air resistance, these two forces act independently of each other.
Therefore, the horizontal component of the velocity remains constant, while the vertical component increases over time due to the Earth's gravity. It's important to note that while the direction of the ball's velocity is changing (since it's arcing downwards), the horizontal component of that velocity remains constant at 8m/s. The ball is moving in a downward arc but still maintains that original horizontal speed.
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for an object that is speeding up in the positive direction, what does the displacement vs. time graph look like?
Answer:
The speeding up is steady, it is a parabola (a=V*t+(at^2)/2), and give it's an equation in connection to time, at that point, it is conceivable to discover the separation recipe by utilizing more substantial amount mathematics(integrals).
Explanation:
Answer:
displacement vs time graph will look like a parabolic shaped graph
Explanation:
As we know that the displacement of an object is given by kinematics equation when object is moving with uniform acceleration
So we know that
[tex]d = v t + \frac{1}{2}at^2[/tex]
now here since velocity is increasing in positive X direction as well as the acceleration is also in same direction then the displacement vs time graph must be a straight line graph
so we will have
how much heat is needed to raise the temperature of 6g of water by 15°C
Answer:
Explanation:
Firstly, we need the specific heat capacity of water which is typically around 4200J/kg (if the mass is in kg) or 4.2 J/g ( if mass is in g)
The formula for the heat energy needed is
E=mct
Where E is the heat energy, m is the mass of water, c is the specific heat capacity and t is the change in the temperature.
E= 6 x 4.2 x 15
= 378 J
Hope this helps!!!
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Which statement is true ?
Answer:
it depends only on the forces acting along the y axis I think
Answer:
option B
Explanation:
The correct answer is option B.
Assuming the motion of the object will be in the x-direction.
To move the object we need to apply the force on the body.
the line of action of the force should be in the x-direction to overcome the resistance to move the object.
Does the theory of relativity show that Newtonian mechanics is wrong?
Answer:
Einstein extended the rules of Newton for high speeds. For applications of mechanics at low speeds, Newtonian ideas are almost equal to reality. That is the reason we use Newtonian mechanics in practice at low speeds.
Explanation:
But on a conceptual level, Einstein did prove Newtonian ideas quite wrong in some cases, e.g. the relativity of simultaneity. But again, in calculations, Newtonian ideas give pretty close to correct answer in low-speed regimes. So, the numerical validity of Newtonian laws in those regimes is something that no one can ever prove completely wrong - because they have been proven correct experimentally to a good approximation.
General Relativity can explain how objects curve space-time.
Newton Mechanics is a particular case of relativity.
The theory of general relativity of Einstein basically related the space-time and the mass of an object. This equivalence is represented in the field equation.
So we can say now that the mass of an object, our sun, for example, can curve the space-time around it. Newton talks about a gravity force but gravity is just the deformation of space-time.
Now, the newton mechanics work perfectly in the system when the speed is less than the speed of light and when masses are apreciables, but general relativity is a general theory that explains how massive objects interact with each other.
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ANSWER FAST FOR BRAINLIEST!
What type of image is formed by a refracting telescope?
an enlarged, upside-down virtual image
a reduced-size, right-side-up virtual image
a reduced-size, right-side-up real image
an enlarged, upside-down real image
Answer:
the last one
Explanation:
The type of image which is formed by the refracting telescope are magnified inverted and non-real image.
Answer: Option A
Explanation:
The refractive lens uses it lens as the objective to form an image. This type of telescope are used as spy glasses and astronomical telescopes.
The refracting telescope makes the magnified image which can be also be termed as the enlarged image. Image formed by the refracting telescope is the inverted image which can also be written as the upside down image.
The nature of image formed is non-real that is virtual image. The purpose of telescope is to see far distant object and thus needs to produce enlarged image.
When word is done on an object by an ———- force, there will be a change in the total mechanical energy of the object. If ———- forces do work total mechanical energy will be conserved.
A. Internal, external
B. External, internal
C. Internal, applied
D. None of the above
According to “Law of conservation of mechanical energy”, there would be change in total mechanical energy of the object, when INTERNAL forces is applied on object. If EXTERNAL forces are applied, when mechanical energy will be conserved.
Answer: Option A
Explanation:
When the object experiences an internal force, the mechanical energy of the closed system changes whereas when the object experiences an external force, the closed system do not have any change in the mechanical force, according to the law of conservation of mechanical energy.
A company wants to start a nuclear power plant as a way to produce clean energy. They want to use the same reaction that's used in thermonuclear weapons. Which of the following explains why this is not possible?
A. The energy in nuclear fusion is too small to generate electricity.
B. The energy in nuclear fission produces chemicals that harm the environment.
C. The energy in nuclear fission burns out as soon as it's produced.
D. The energy in nuclear fusion can't be generated in a controlled manner
The correct choice is D .
"Thermonuclear" is the fancy word used to indicate nuclear fusion ... the source of energy in the so-called "H-bomb".
Fusion has everything going for it:
-- The raw material it uses is Hydrogen, which is cheap, plentiful, and all around us (in water).
-- The waste products left over from the reaction are ... water and Hydrogen ! Which are totally non-polluting.
-- The reaction produces a ginormous amount of energy.
That's why scientists and engineers have have been working around the clock for the past 60 years to figure out a way to use nuclear fusion to produce cheap, clean energy for commercial use. But we don't have it yet.
Why is that ? The answer is: Because nuclear fusion is a lot like the mythical "Universal Solvent".
Think about this: If you discovered a substance that could dissolve ANYTHING, could you sell it ? You'd think it would be pretty valuable, right ?
Yes it would. But what could you keep it in ?
Nuclear fusion is something like that. It produces SO MUCH energy that we haven't found a way to CONTROL it yet ... start it and stop it, keep it going when you want it to keep going, keep it in one place without destroying the building, and draw off some of the energy in a nice controlled process.
Once we develop ways to operate a fusion reaction and control it safely, energy may become so cheap that it's not even worth putting meters on the outside of our houses. But we're not there yet.
A cold glass is left sitting outside on a hot day. Soon, water droplets form on the outside of the glass. Describe the events that must occur for the water droplets to form on the glass.
Answer:
Water vapor from the air cools and condenses into water.
Explanation:
.
A player uses a hockey stick to push a puck at a constant velocity across the ice. The weight of the puck is 170 N. The
coefficient of friction is 0.0600. With what force must the player push the puck so that his force just equals the frictional
force?
28.3 N
0.999 N
0.102 N
0.0104 N
Answer: The minimum force by which player should hit the puck to move it is 0.102 N.
Explanation:
Weight of the puck = 1.70 N
This weight of the puck is the force acting normal to the surface that is:
N = 1.70 N
The coefficient of friction =
Frictional force =
The minimum force by which player should hit the puck to move it is 0.102 N.
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Answer:
F=10.2N : Force with which the player must push the disc
Explanation:
Conceptual analysis
We apply Newton's first law because the speed is constant in horizontal direction (x):
∑Fx = 0 Formula (1)
We apply Newton's first law because the speed is zero in vertical direction (y):
∑Fy= 0 Formula (2)
∑F: algebraic sum of forces in Newton (N)
We calculate the friction force with the following formula:
Ff=f*N Formula (3)
Ff= friction force in Newtons (N)
f = coefficient of friction
N= Normal force in Newtons (N)
Known data:
Wp = 170 N : puck weight
f = 0.0600 :coefficient of friction
Problem development
We replace the data in formula (1) and (2), considering that the force is positive (+) if it goes in the direction of the movement and negative (-) if it opposes the movement:
∑Fy= 0
N-Wp=0
N= Wp=170 N
∑Fx =0
F - Ff=0 F :force with which the player must push the disc
F - 0.0600*170 =0
F=10.2N
1. A 70 kg skier moving at 5 m/sec down a slope. What is the skier's momentum?
A. 35 (kg m)/sec
B. 350 (kg m)/sec
C. 75 (kg m)/sec
D. 755 (kg m)/sec
B. 350 kg m/s. A skier of 70kg at 5m/s down a slope will have a momentum of 350kg m/s.
The linear momentum or momentum is represented by the letter p and is defined as the product of the mass of a body by its velocity, that is:
p = m · v
Therefore, when a body is in motion it has a non-zero moment. If it is at rest, its moment is zero. In the International System, it is measured in Kg · m / s.
A 70 kg skier moving at 5m/s down a slope will have a momentum:
p = (70kg)(5m/s) = 350kg m/s