Answer:
Explanation:H2 which is mean 2 atoms of hydrogen
Answer:
2
Explanation:
1. This image shows the various forces acting on a block of rock situated on a rock slope. What does arrow 4 represent?
A. Shear strength
B. Gravitational force
C. Normal force
D. Shear force
Answer:
B. Gravitational force
Explanation:
The gravitational force of an object (also called weight) is given by
[tex]F=mg[/tex]
where m is the mass of the object and g is the acceleration of gravity, and it always points in the downward direction.
In this problem, the arrow labelled with 4 is the only force pointing downward: therefore, it must be the gravitational force.
The other arrows represent:
1 --> component of the gravitational force parallel to the plane
2 --> force of friction
3 --> component of the gravitational force perpendicular to the plane
A ramp is often used to raise an object. If 80 joules of energy are needed to lift an object to a platform but 100 joules are
used in rolling the object up the ramp, what percent of energy was wastec in the form of heat due to friction?
Answer:
20
Explanation:
Answer:
20 % of energy is wasted
Explanation:
If 100 joules of energy are used when 80 joules was needed, then 100 - 80 = 20 joules were wasted. Given that 100 joules are proportional to 100 % of energy used, then 20 joules is proportional to x %, therefore:
20 J/100 J = x%/100%
x = 20%
What does a weather balloon do? Check all that apply.
warns about severe weather
enables forecasts seven to 10 days in advance
measures conditions in the upper atmosphere
collects data that predicts changes in the atmosphere
uses mathematical equations to show what will happen if conditions change
Answer:
Answers are, A, B, C, and D
Answer:
its actually a,c & d :) on edg
Choose all of the terms that are appropriate for a situation that produces
work.
A. The momentum is greater than the force.
O
B. An object maintains its state of motion.
O
c. A force acts
D. The object moves.
SUBMIT
Answer:
-The object moves
-A force acts
Explanation:
(apex)
how to calculate displacement?
-- Take a straight ruler.
-- Lay it down with the 'zero' mark at the start point.
-- Rotate it around the start point until the end point is also touching the edge of the ruler.
-- From the marks on the ruler, read the straight-line distance from the start point to the end point.
-- Without moving the ruler, observe and write down the DIRECTION from the start point to the end point.
-- The Displacement is the straight-line distance and direction from the start point to the end point.
Displacement is the change in an object's position. It can be calculated simply as the difference between final and initial position. If using a velocity-time graph, calculate the area under the graph.
Explanation:Displacement, in the context of physics, refers to an object's overall change in position. It is a vector quantity, meaning it has both magnitude (distance) and direction. The simple way to calculate displacement is by using the formula Ax = x₁ - x₀, where x₁ is the final position and x₀ is the initial position.
If you are dealing with a velocity-time graph, displacement can be found by calculating the area under the graph. For example, if your graph shows a rectangle and a triangle under the line, you will calculate the area of both and add them up to get the displacement.
In more complex situations that involve multiple displacements in different directions, you can draw displacement vectors on a scale (like 1 cm of vector length equals 1 m in the problem) and add them up to find the total displacement. Remember, direction is important in displacement calculation.
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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.
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.
What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot water
bath in a chemistry lab?
to avoid reactions of the metal with gases in the lab
to reduce the risk of bums from heat conducted through the metal
to minimize the chance the bracelet pulling over a test tube, causing a spill
to prevent misreading the temperature of the bath on a thermometer
Answer:
c
Explanation:
this equestion is about the safety
Answer: To minimize the chance the bracelet pulling over a test tube, causing a spill.
Explanation:
A chemistry lab is a laboratory where the potential hazards related to the chemicals may result if safety precautions are neglected. The chances of the cause of chemical splash, burns from chemicals or fire hazards can possibly happen in a chemistry lab. The use of ornaments should be avoided in the chemical lab. Proper safety measures are to be taken to protect the body from chemical hazards by wearing close toed shoes, lab coat and gloves.
A dangling bracelet worn during the heating process is likely to spill off the acid solutions by pulling over a test tube. The test tube neck may get caught in the dangling bracelet. The test tube may collapse and break. Thus the dangling bracelet should be avoided during the process of heating.
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.
In all trials, the magnitude of the final velocity for G1 + G2 was less than the magnitude of any initial velocity. As mass increased, what happened to the velocity?
The velocity decreased.
The velocity increased.
The velocity of G1 + G2 could not be measured.
The velocity was not affected by the mass increase.
Answer: The Velocity Decreased
Explanation: e2020 answer
The magnitude of the final velocity for G1 + G2 will be less than any initial velocity because ; The velocity decreased ( A )
when the mass of an object on motion is increased by the addition of additional weight on the object, the velocity of the object on motion will start to decrease ( i.e. deceleration )
Therefore the magnitude of the final velocity for G1 + G2 will be less than the magnitude of their initial velocities as they experience an increase in mass, respectively.
Hence we can conclude that The magnitude of the final velocity for G1 + G2 will be less than any initial velocity because ; The velocity decreased.
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Select the three natural sciences.
Answer:
biology, chemistry, and physics
Answer: Biology, chemistry and physics
Explanation: The natural sciences include;
physics; this is the study of physical quantity of matter such as length, time etc.
Chemistry; this is the study of the chemical composition of matter and other living and non living things. The chemical properties may include
Biology is the study of life. It is the Study of life existence.
In scientific notation 8700 is written
Answer:
8.7 x 10^3 is the correct answer.
Answer:
8.7 x 10^3
I have no explanation, I just know that it is written as this
In the diagram, the liquid is vaporizing at which point?
gas
Answer:
Point c
Explanation:
The diagram shows that the liquid changes to a gas a the point c hope this helped :)
What happens to light waves from a star as the star moves away from Earth?
The astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed the spectral lines were displaced towards the red (red shift), whereas the nearby galaxies showed a spectrum displaced to the blue.
From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum. The same happens with the stars and this phenomenom is known as the Doppler effect.
This phenomenon refers to the change in a wave perceived frequency (or wavelength=color) when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other. For example, as a star moves away from the Earth, its espectrum turns towards the red.
Answer:
they shift towards red
Explanation:
A P E X
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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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 is one of Kepler's laws of planetary motion?
The Kepler laws of planetary motion are:
1) The planets revolve around the Sun following elliptical orbits, in which the Sun occupies one of the two focii
2) A line segment connecting the Sun with the center of each planet sweeps out equal areas in equal intervals of time --> this means that the speed of the planet changes according to its distance from the Sun: the closer to the Sun, the faster the planet
3) The square of the orbital period of the planets is proportional to the cube of the semi-major axis of the orbit. In formula
[tex]\frac{T^2}{r^3} = const.[/tex]
and the constant in the equation has the same value for every planet orbiting around the Sun.
Kepler's first law of planetary motion states that every planet orbits the Sun in an elliptical shape, with the Sun at one of the focal points of the ellipse. This law helps to calculate planetary positions with increased precision within the Copernican system.
Explanation:One of Kepler's laws of planetary motion is his first law, which states that each planet moves around the Sun in an orbit that is an ellipse, with the Sun located at one focus of the ellipse. This concept emerged based on the careful analysis of precise data collected, revolving around the positions in the sky of all the known planets and the Moon. The elliptical orbits described in Kepler's first law is a fundamental rule which improved the calculation of planetary positions with great precision within the framework of the Copernican system.
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How much heat is needed to raise the temperature of 8grams of water by 19°C
Answer:
635.36J
Explanation:
The formulae to apply in this question is;
q=m*c*ΔФ where q is the heat needed, m is mass,c is specific heat capacity and ΔФ is change in temperatures
Given that;
m=8 g
ΔФ= 19°C - 0°C= 19°C
c=4.18J/g.°C
Substitute values
q= 8×4.18×19 = 635.36J
Two friends are having a conversation. Anna says a satellite in orbit is in freefall because the satellite keeps falling toward Earth. Tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . Who do you agree with and why?
Answer:
Anna is correct.
Explanation:
Anna is right as a satellite is in free fall because it keeps falling toward Earth, meaning that gravity is the only force acting on it. Tom is incorrect because an object does not have to accelerate at a certain speed to be considered to be in free fall. As long as gravity is the only force acting upon the object, it is considered to be in free fall.
From the conversation anna had with tom about the satellite in orbit, we can say that;
Anna is right because falling to the earth means being subject to only gravity which means a freefall.
In physics, freefall is defined as a scenario whereby when an object is in motion, the only force acting on it is that due to gravity. This means that it is basically weightless and has no normal force acting on it
Now, a satellite in orbit means that the satellite is accelerating towards the earth and as a result it would have an orbiting rate equal to the acceleration due to gravity. Thus, only force of gravity is acting on it.
Now, Anna said that a satellite in orbit is in free fall because it keeps falling toward Earth. From our earlier definition, she is correct because falling to the earth means being subject to only gravity which means a freefall.
Whereas, Tom is incorrect because he claims the object is not in freefall.
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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]
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
The
force is the sum of all the forces that act upon an object.
the forces acting on an object is the net force or resultant force. ... Force is a vector and hence has both a direction and magnitude. For example, gravitational force (on earth) acts in downward direction and has a magnitude equal to mass of the object and acceleration due to gravity.
Answer:
Explanation:
The net force or resultant force is sum of all the forces act upon an object. As force is a vector quantity it has both magnitude as well as direction. so net force is calculated by keeping direction of application in mind such as friction force is always acts in the direction opposite to the motion of object and gravitational force always acts downwards.
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.
Mountain ranges that form close to a subduction zone are likely to experience
A. reduced elevation. B. decreased mass. C. volcanic activity. D. isostatic equilibrium.
Answer:
the correct answer choice woud be C. hope this helps :)
Explanation: Mountain ranges that form close to a subduction zone are likely to experience volcanic activity.
Answer:
C) Volcanic activity.
Explanation:
When an oceanic plate is subducted ( brought underneath) under a continental plate, the sediments of seafloor which is rich in water and carbon dioxide are also brought under the plate .These elements act as flux reducing the melting point of magma which comes out in the form of volcanic eruption.
Which motions are the components of projectile motion?
Projectile motion contains both horizontal and vertical motion.
Answer:Contains both Horizontal and Vertical Motions
Explanation:
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 :)
More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a
car crashing into a brick wall at 30 mph because:
The relative velocity of the head-on collision is the product of the two velocities.
The relative velocity of the collision of the wall is absorbed by the wall.
The relative velocities are opposite of each other and therefore have a net sum of zero.
The relative velocities of the head-on collision are the sum of the two velocities.
Answer:
More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a car crashing into a brick wall at 30 mph because the relative velocities of the head-on collision are the sum of the two velocities.
Explanation:
Car crashing to a brick wall at 30 mph is less dangerous than two cars travelling in opposite direction at 30 mph each.
This is because, for one car, the other is at a relative speed of 30+30 = 60 mph.
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
What is the electrical power when the current is 25 amps and the voltage is 10 volts?
25 watts
250 watts
2.5 watts
2,500 watts
Answer:
B
250 watts.
Explanation:
The formula for wattage is
P = E * I
E = 10 volts.
I = 25 amps
P = 10 * 25
P = 250 Watts.
Answer:250
Explanation:
Electric power=IV
=25*10
=250Watts
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