Answer:
slope \(=\frac{y_{2} -y_{1} }{x_2-x_1}\)
Explanation:
the slope of a graph in general is the following
slope \(=\frac{y_{2} -y_{1} }{x_2-x_1}\) (1)
1) Pick two points on the graph
2) The coordinate of the first point is\((x_1,y_1)\), while the second point is \((x_2,y_2)\).
3) Substitute with the coordinate values in equation (1) to get the slope
An elevator travels at an average velocity of +5 m/s for 10 seconds and then -8 m/s for 5 seconds. Determine the elevator's displacement.
Displacement at 10s
\(\\ \bull\tt\dashrightarrow Velocity\times Time\)
\(\\ \bull\tt\dashrightarrow 5(10)=50m\)
Displacement at next 5s
\(\\ \bull\tt\dashrightarrow -8(5)=-40m\)
Now
Total displacement=50-40=10m
A car with a mass of 1,500 kg is driving at 20 m/s. What is the kinetic energy of the car?
O 15,000 J
O 300,000 J
O 30,000 J
O 150,000 J
The kinetic energy of the car is 300,000J
What is Kinetic energy?Kinetic energy is the energy of motion.
The formula for kinetic energy is given as \(K.E = \frac{1}{2} mv^{2}\)
where m = mass of object , v = speed of object.
An object having some speed and mass will have kinetic energy while an object at rest will not have any kinetic energy since the speed of object at rest is zero.
Since at rest speed is zero, an object has kinetic energy only when it is in motion.
From the question,
m = 1,500kg
v = 20m/s
K.E = (1/2) x 1,500 x 20 x 20
K. E = 300,000J
The car now possess a kinetic energy of 300,000J
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Which of these structures is the most superior?
the mouth
the adam's apple
the belly button
the nose
Suppose a spectral line of hydrogen, normally at 500 nm when measured in a lab on Earth, is observed in the spectrum of a star to be at 500.3 nm. This is called a red shift because the wavelength is longer (and red is on the long-wavelength side of the visible spectrum). How fast is the star moving away from Earth? Give your answer in m/s. Hint: follow example 5.6. Compare in particular to the "Check your learning" calculation, and note that larger Δλ means larger speed.
The star is moving away from Earth at a velocity of 1.8 x 106 m/s.
The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.
The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.
The velocity of a star moving away from Earth can be determined using the equation:
v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).
In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.
The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.
Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.
Therefore, velocity of star 1.8 x 106 m/s.
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100 POINTS AND BRAINLIEST IF YOU CAN ANSWER THIS QUESTION
What variables would be required for a computational model that predicts change in the energy of a falling object?
A. acceleration, speed, mass
B. x, y, z
C. momentum, speed, mass
D. height, speed, mass
Answer:
Height, speed, mass
Explanation:
Answer:
D height, speed, mass
Explanation:
I took this test early november
the specific heat of copper is 0.385 j/g °c. how much thermal energy is required to increase the temperature of a 20g sample of copper from 20°c to 50°c?
The amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.
What is thermal energy?The entire quantity of kinetic energy found in the particles of an object or material is referred to as thermal energy. It is a type of energy connected to atomic and molecular motion within a substance. Conduction, convection, and radiation are a few examples of mechanisms that can be used to transmit this energy from one item to another. An object's thermal energy content is inversely related to its temperature, with higher temperatures denoting a higher thermal energy content. Through the transformation of heat energy into mechanical energy, thermal energy is employed in a variety of processes, including heating houses, preparing food, and creating electricity.
The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:
Q = m x c x ΔT
Where:
Q = amount of thermal energy in Joules (J)
m = mass of the substance in grams (g)
c = specific heat capacity of the substance in J/g°C
ΔT = change in temperature in °C (final temperature - initial temperature)
Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:
Q = 20g x 0.385 J/g°C x (50°C - 20°C)
Q = 20g x 0.385 J/g°C x 30°C
Q = 231 J
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The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:
Q = m x c x ΔT
Where:
Q = amount of thermal energy in Joules (J)
m = mass of the substance in grams (g)
c = specific heat capacity of the substance in J/g°C
ΔT = change in temperature in °C (final temperature - initial temperature)
Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:
Q = 20g x 0.385 J/g°C x (50°C - 20°C)
Q = 20g x 0.385 J/g°C x 30°C
Q = 231 J
Therefore, the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.
According to the kinetic theory, all matter is composed of _______.
Answer:
According to the kinetic theory, all matter is composed of _______.
Explanation:
The Kinetic Theory of Matter states that matter is composed of a large number of small particles, individual atoms or molecules, that are in constant motion. Matter is made up of particles that are constantly moving. All particles have energy, but the energy depending on the temperature of which matter is in.
According to the kinetic theory, all matter is composed of large number of identical small molecules.
What is kinetic theory of gases?
A lot of the fundamental ideas of thermodynamics were established with the help of the kinetic theory of gases, a straightforward yet historically significant classical model of the thermodynamic behavior of gases.
According to the model, a gas is made up of numerous identical submicroscopic particles (atoms or molecules) that are all moving rapidly and randomly.
It is considered that they are substantially smaller in size than the particle spacing on average. Random elastic collisions between the particles and with the container's walls occur between the particles. The simplest form of the model only takes into account the interactions within the ideal gas.
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A cyclist peddles from 5ft/s to 12ft/s over the distance of 50 ft. how long did the acceleration take?
A cyclist peddles from 5ft/s to 12ft/s over the distance of 50 ft. The acceleration will take place for 1.19ft/s^2. It can be calculated by the formula v^2-u^2 = 2as.
v^2-u^2 = 2as
a=v^2-u^2/2s =144-25/2(50)
a=119/100 =1.19ft/s^2
What is acceleration?
The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. The rate at which velocity changes is called acceleration.
What three forms of acceleration are there?
The three main types of accelerated motions are uniform acceleration, non-uniform acceleration, and average acceleration.
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A cyclist peddles from 5ft/s to 12ft/s over the distance of 50 ft. The acceleration will take place for 1.19ft/s^2. It can be calculated by the formula v^2-u^2 = 2as.
v^2-u^2 = 2as
a=v^2-u^2/2s =144-25/2(50)
a=119/100 =1.19ft/s^2
What is acceleration?The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. The rate at which velocity changes is called acceleration.
What three forms of acceleration are there?The three main types of accelerated motions are uniform acceleration, non-uniform acceleration, and average acceleration.
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What are the 7 steps of scientific method in order?
Answer:
1. Make an observation or ask a question.
2. Gather background information.
3. Create a hypothesis.
4. Create a prediction and perform a test.
5. Analyze the results and draw a conclusion.
6. Share the conclusion or decide what question to ask next.
7. Document the results of your experiment.
Hope this helps!
Seven scientific methods are observation, research, hypothesis, experimentation, data collection, result, conclusion and note.
What are the steps of scientific method ?Observation: Observe and identify a problem or question to be solved.
Research: Research and gather information and background knowledge on the problem.
Hypothesis: Develop a possible solution or explanation (hypothesis) for the problem.
Experimentation: Plan and conduct experiments to test the hypothesis.
Data Collection: Collect and analyze data from the experiments.
Results: Interpret and analyze the results to determine if the hypothesis was supported or rejected.
Conclusion: Draw a conclusion and make a statement about the problem based on the evidence collected during the experiments.
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he difference between mass and weight. *
A crate of books is dragged horizontally across a rought floor at a constant
velocity. If the normal force acting on the crate is 66 Newtons, determine the
mass of the crate.
Answer:
m = 6.73 kg
Explanation:
Given that,
The normal force acting on the crate = 66 N
We need to find the mass of the crate.
Normal force = weight of the crate
N = mg
m is mass of the crate
\(m=\dfrac{N}{g}\\\\m=\dfrac{66}{9.8}\\\\m=6.73\ kg\)
So, the mass of the carte is 6.73 kg.
a meteorologist wants to know if east and west australia have the same distribution of storms. what type of test should she use?
A meteorologist wanting to know if east and west Australia have the same distribution of storms should use a statistical test called the Chi-Square Test for Independence.
This test helps determine if there is a significant association between the two categorical variables (in this case, storm distribution in east and west Australia).
1. Formulate the null hypothesis (H0): There is no association between the storm distribution in east and west Australia (i.e., the distributions are the same).
2. Formulate the alternative hypothesis (H1): There is an association between the storm distribution in east and west Australia (i.e., the distributions are different).
3. Collect data on the storm occurrences in both east and west Australia for a specific period.
4. Create a contingency table with the observed frequencies of storms in each region.
5. Calculate the expected frequencies for each cell in the table based on the assumption that H0 is true.
6. Compute the test statistic, Chi-Square (X²), by comparing observed and expected frequencies.
7. Determine the degrees of freedom (df) for the test, which is (number of rows - 1) * (number of columns - 1).
8. Find the critical value for the chosen significance level (e.g., α = 0.05) and the calculated degrees of freedom.
9. Compare the test statistic (X²) to the critical value. If X² is greater than the critical value, reject H0 and accept H1. If X² is less than or equal to the critical value, do not reject H0.
By following these steps, the meteorologist can determine if there is a significant difference in the storm distributions between east and west Australia.
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Supposed there is no electrical current in a coil of wire that contains a permanent magnet. Which statement must be true?
A. The coil and the magnet are of different lengths
B. The coil and the magnet are the same length
C. The coil and the magnet are not moving relative to each other
D. The coil and the magnet are moving relative to each other
Answer:
c
Explanation:
a pex
When a coil of wire is stationary and there is no relative motion between the coil and a permanent magnet, there will be no induced electrical current in the coil. The correct statement in this scenario would be C. The coil and the magnet are not moving relative to each other.
Electromagnetic induction states that a change in magnetic field through a conductor (in this case, the coil of wire) will induce an electromotive force (EMF) or voltage across the ends of the conductor. This induced voltage can then drive an electric current to flow if there is a complete circuit.
When there is no electrical current flowing through a coil of wire that contains a permanent magnet, the interaction between the magnetic field of the magnet and the coil's magnetic field depends on their relative motion. In this case, if there is no movement between the coil and the magnet, the magnetic fields are not changing with respect to each other. Therefore, the absence of relative motion between the coil and the magnet is the condition in which no electrical current is induced in the coil.
Therefore, the correct statement in this scenario would be C. The coil and the magnet are not moving relative to each other.
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Describe an atom using mass and atomic number. Please help.
a high-speed drill reaches 2500 rpm in 0.59 s .
a) What is the drill's angular acceleration? b)Through how many revolutions does it turn during this first 0.50s?
A high-speed drill reaches 2500 rpm in 0.59 s, a) The drill's angular acceleration is approximately 443.73 rad/s^2. b) The drill turns approximately 10.41 revolutions during the first 0.50s.
a) The drill's angular acceleration can be calculated using the formula:
Angular acceleration (α) = (Final angular velocity (ωf) - Initial angular velocity (ωi)) / Time taken (t)
Given:
ωi = 0 (initially at rest)
ωf = 2500 rpm = 261.8 rad/s (converted to radians per second)
t = 0.59 s
Substituting the values, we get:
α = (261.8 rad/s - 0) / 0.59 s
α ≈ 443.73 rad/s^2
b) The number of revolutions the drill turns during the first 0.50s can be calculated using the formula:
Number of revolutions = (Angular displacement (θ)) / (2π)
Given:
ωi = 0 (initially at rest)
ωf = 2500 rpm = 261.8 rad/s (converted to radians per second)
t = 0.50 s
Using the formula, we can first calculate the angular displacement (θ) of the drill:
θ = (ωf + ωi) / 2 * t
θ = (261.8 rad/s + 0) / 2 * 0.50 s
θ = 65.45 radians
Substituting this value in the formula for the number of revolutions, we get:
Number of revolutions = 65.45 radians / (2π)
Number of revolutions ≈ 10.41 revolutions
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what forces are being used when walking a dog and how ?
Select the correct images.
Identity the electromagnets with poles that are reversed from the electromagnet shown above.
Answer:
I think it is the third one
Explanation:
Everything about it is flipped
The electromagnets with poles that are reversed from the electromagnet is according to image C.
What is magnet?A substance which is negative charged at one end and positive charged at another end creating the magnetic field around it.
A bar is a magnet which can attract the particle which are charged. It has two poles North and South.
The electromagnet is find in the electric motor. In the motor, loop made up of conductor is rotated by the effect of magnetic field of permanent magnet.
An electromagnet is a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
When the poles are reversed, then the direction of current flow is also reversed.
Thus, the correct option is C.
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An 818 kg drag race car accelerates from rest to 109 km/h in 0. 926 s. What change in momentum does the force produce? answer in units of kg · m/s.
Answer:109km/h = 30.28
let change in momentum be cip
cip = m ( vf - vi )
cip= 818 ( 30.28 - 0)
cip = 24769.04 kg . m/s
Explanation:
What do organisms get when Glucose is broken down?
Answer:
Explanation:
chemical energy :) yay... we can live :D
An object moves in a horizontal circle with a speed of 2.0 m/s. What would be its speed if the radius of its motion doubled? (Assume the centripetal force and mass remain constant.)
ons in
Finance - on
plorer
1.5 m/s
0 2.8 m/s
4.0 m/s
5.2 m/s
8.3 m/s
Answer: how do do it
Explanation:
ur welcome
A mechanic oils his tools between uses. Explain how this relates to friction andefficiency.
Answer:
it reduces friction
Explanation:
if you put oil or any liquid between the tool it will shift and change the shape as much as it needs to. It will smooth the bumps between the tools gears as they squeeze together making the friction reduce. It will slide and that reduces the friction.
i hope this helps im lowkey just guessing tho so sorry if it doesnt. lmk tho
How many unpaired electrons are present in the ground state electronic configuration of a carbon atom?.
Answer:
Two
Explanation:
Here, the electron configuration of carbon (C) shows that two unpaired electrons exist. In this case, the valency of the carbon atom is 2. When the carbon atom is excited more than this, the electron configuration of carbon changes again. The 2nd electron configuration of a carbon atom in excited state is C* (6) = 1s 2 2s 1 2p x1 2p y1 2p z1 .
girIs that dichotomous, or “black-and-white,” thinking plays a key role in producing and maintaining dependent personality disorder comes from the _____ perspective.
girls that dichotomous, or “black-and-white,” thinking plays a key role in producing and maintaining dependent personality disorder comes from the cognitive-behavioral perspective.
Cognitive behavioral therapy (CBT) is a speakme remedy that assists you to manipulate your problems by changing the manner you believe you studied and behave. it's most usually used to treat tension and despair, however, may be useful for different mental and physical health troubles.
CBT remedy generally involves efforts to trade thinking styles. these strategies may encompass: studying to understand one's distortions in wondering that are developing issues, after which to reevaluate them in light of truth. Gaining a better understanding of the behavior and motivation of others.
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A ball accelerates uniformly at −2.00 m/s2.
If the ball was initially moving at 0.20 m/s and the ball travels for 7.00 s, then what was its final velocity?
−1.8 m/s
negative 1.8 meters per second
−13.8 m/s
negative 13.8 meters per second
−14.2 m/s
negative 14.2 meters per second
+13.8 m/s
The final velocity of the ball, given the data is –13.8 m/s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the final velocityThe final velocity of the ball can be obtained as follow:
Acceleration (a) = −2 m/s² Initial velocity (u) = 0.2 m/sTime (t) = 7 sFinal velocity (v) = ?a = (v – u) / t
–2 = (v – 0.2) / 7
Cross multiply
v – 0.2 = –2 × 7
v – 0.2 = –14
Collect like terms
v = –14 + 0.2
v = –13.8 m/s
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If the pressure head in the aquifer is 100 ft., calculate the effective stress (N/m") in the aquifer.
If the aquifer is pumped and the hydraulic head at some point is reduce by 12 ft., what will be the resulting changes in the pressure head (m), the effective stress (N/m*), the fluid pressure (N/m*), and the total stress (N/m? ?
The resulting changes will be:
1. Pressure head: 88 ft (or 26.82 m)
2. Effective stress: No change, assuming no other factors affect it
3. Fluid pressure: No change
4. Total stress: Decreased by the same amount as the effective stress
To calculate the effective stress in the aquifer, we need to subtract the fluid pressure from the total stress.
Given:
Pressure head in the aquifer = 100 ft (or 30.48 m)
The pressure head in the aquifer is directly proportional to the fluid pressure, which can be calculated using the formula:
Fluid pressure (P) = ρ * g * h
Where:
ρ = density of the fluid (water) = approximately 1000 kg/m³
g = acceleration due to gravity = 9.8 m/s²
h = pressure head
Fluid pressure = 1000 kg/m³ * 9.8 m/s² * 30.48 m ≈ 298,440 N/m² (or Pa)
The total stress in the aquifer is the sum of the fluid pressure and the effective stress. Therefore, the effective stress can be calculated by subtracting the fluid pressure from the total stress.
Now, let's consider the changes in the hydraulic head due to pumping:
Change in hydraulic head = -12 ft (or -3.66 m)
The resulting changes in each parameter will be as follows:
1. Pressure head:
The pressure head will be reduced by 12 ft, so the new pressure head will be 100 ft - 12 ft = 88 ft (or 26.82 m).
2. Fluid pressure:
The fluid pressure does not change, as it depends on the density of the fluid and the acceleration due to gravity, which remain constant.
3. Effective stress:
The effective stress can be calculated as the total stress minus the fluid pressure. Since the fluid pressure remains constant, the effective stress will also remain constant unless there are other factors affecting it.
4. Total stress:
The total stress is the sum of the fluid pressure and the effective stress. As mentioned earlier, the fluid pressure remains constant, so the total stress will decrease by the same amount as the effective stress, assuming no other factors affect the total stress.
Therefore, the resulting changes will be:
1. Pressure head: 88 ft (or 26.82 m)
2. Effective stress: No change, assuming no other factors affect it
3. Fluid pressure: No change
4. Total stress: Decreased by the same amount as the effective stress
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For which segment does the cart move the greatest distance? a. ABb.BCc. CDd. DEWhat feature of the graph did you use to determine the distances?
ANSWER:
a. AB
STEP-BY-STEP EXPLANATION:
The greatest distance occurs when the speed is increasing and also takes less time to reach that speed.
According to the graph, the highest speed is 8 m/s and it reaches it in 3 seconds, therefore, it is where the greatest distance is given.
Therefore, the segment of greater distance is the segment AB
Choose the word that best completes each sentence.
Plants are
. They make their own food.
Animals are
. They consume other organisms for food.
A pitching machine throws a 0.148kg baseball to the left at 26m/s. A batter then hits the baseball directly back at 39m/s. What is the change in momentum of this baseball
Let us assume that the initial direction of the ball, i.e., from the pitching machine to the batter as the negative direction, and the final direction of the ball is the positive direction.
Given,
The mass of the baseball, m=0.148 kg
The initial velocity of the baseball, u=-26 m/s
The final velocity of the baseball, v=39 m/s
The momentum of the ball before the batter hits it is given by,
\(p_1=mu\)On substituting the known values,
\(\begin{gathered} p_1=0.148\times-26 \\ =-3.848\text{ kg}\cdot\text{m/s} \end{gathered}\)The momentum of the ball after the batter hits it is given by,
\(p_2=mv\)On substituting the known values,
\(\begin{gathered} p_2=0.148\times39 \\ =5.772\text{ kg}\cdot\text{m/s} \end{gathered}\)The change in the momentum is given by,
\(\Delta p=p_2-p_1\)On substituting the known values,
\(\begin{gathered} \Delta p=5.772-(-3.848) \\ =9.62\text{ kg}\cdot\text{m/s} \end{gathered}\)Thus the change in the momentum of baseball is 9.62 kg·m/s
A bus and a Car are traveling along the EDSA having the same velocity. which if the two vehicles would have a greater momentum?a. the busb. the carc. both have the same momentumd. cant be easily determined
The momentum of an object can be calculated with the formula below:
\(p=mv\)Where p is the momentum, m is the mass and v is the velocity.
The mass of the bus is greater than the mass of the car.
So, if they have the same velocity, the momentum of the bus will be greater.
Correct option: a.
give an example of a phenomenon occurring in nature. write which natural sciences study them.
The formation of fossils by the decomposition of dead plants and animals across millions of years is a phenomenon in nature studied by paleontology and geology.
What is the formation of fossils?The formation of fossils is a process associated with the decomposition of dead plants and animals along with million of years in earth's history, which is a process studied by geologists and also paleontologists.
Therefore, with this data, we can see that the formation of fossils occurs due to the process of the decomposition of dead plants and animals and it is studied in geology.
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