A roller coaster speeds up with constant acceleration for 2.3\,\text{s}2.3s2, point, 3, start text, s, end text until it reaches a velocity of 35\,\dfrac{\text{m}}{\text{s}}35
s
m
35, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction over 41\,\text{m}41m41, start text, m, end text. We want to find the initial velocity of the roller coaster before it started to accelerate.
Which kinematic formula would be most useful to solve for the target unknown?
Answers
Answer:
This one:
Explanation:
Khan academy answer
Related Questions
In FIGURE 2, a block of mass m=2.5 kg slides heads on into a spring of spring constant k=320 N/m. When the block stops, it has compressed the spring by 7.5 cm. The coefficient of kinetic friction between block and floor is 0.25. While the block is in contact with the spring and being brought to rest, calculatea. the work done by the spring force.b. the increase in thermal energy of the block-floor system.c. What is the block's speed just as it reaches the spring?
Answers
(a)
The work done by the spring force can be calculated with the formula below:
\(W=\frac{1}{2}kx^2\)Using k = 320 N/m and x = 0.075 m, we have:
\(\begin{gathered} W=\frac{1}{2}\cdot320\cdot0.075^2\\ \\ W=0.9\text{ J} \end{gathered}\)(b)
The increase in thermal energy is given by the work done by the friction force.
To calculate this work, first let's find the friction force:
\(\begin{gathered} F_{friction}=F_{normal}\cdot\mu\\ \\ F_{friction}=m\cdot g\cdot\mu\\ \\ F_{friction}=2.5\cdot9.8\cdot0.25\\ \\ F_{friction}=6.125\text{ N} \end{gathered}\)Now, calculating the work, we have:
\(\begin{gathered} W=F\cdot d\\ \\ W=6.125\cdot0.075\\ \\ W=0.46\text{ J} \end{gathered}\)(c)
The block speed can be found by converting the potential energy from the spring (same value of the calculated work in item a) into kinetic energy for the block:
\(\begin{gathered} PE=KE\\ \\ 0.9=\frac{mv^2}{2}\\ \\ mv^2=1.8\\ \\ 2.5v^2=1.8\\ \\ v^2=\frac{1.8}{2.5}\\ \\ v^2=0.72\\ \\ v=0.8485\text{ m/s} \end{gathered}\)Major help plz I need help
Answers
Explanation:
yup, it's D following Newton's third law of motion
True or false. A small amount of mass can produce a large amount of energy
Answers
The satement is true.
This comes from the fact that, according to Einstein:
\(E=mc^2\)and since c² is a very large number then, if we find a way to convert all the mass in energy a small amount will produce a large amount of energy.
Explain a principal of moments of a force
Answers
The principle of moments states that when a body is balanced the total clockwise moment about a point equals the total anticlockwise moment about the same point.Equation.Moment=Force F×perpendicular distance from the pivot do.
what length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 ω?
Answers
The resistance of a wire is dependent on its length, diameter, and material. In this case, we are given the diameter of the copper wire, which is 0.462 mm, and the resistance of the wire, which is 1.00 Ω. To determine the length of the wire, we need to use the formula for resistance:
R = ρL/A
Where R is the resistance, ρ is the resistivity of copper, L is the length of the wire, and A is the cross-sectional area of the wire.
Since we are solving for L, we can rearrange the formula to:
L = RA/ρ
Using the values given, we have:
L = (1.00 Ω)(π(0.462 mm/2)²)/(1.68 x 10⁻⁸ Ωm)
L = 6.43 x 10³ m or approximately 6.43 kilometers
Therefore, a copper wire with a diameter of 0.462 mm and a resistance of 1.00 Ω has a length of 6.43 kilometers.
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How does static electricity apply to car
paint application?
Answers
Answer:
For electrostatic paint to be applied, the vehicle needs to be grounded and positively charged. This creates a magnetic attraction to the negatively charged paint. Due to this charge, when the paint leaves the nozzle, it is attracted to the vehicle's charge and will stick to it.
Explanation:
Amigos necesito que me ayuden a resolver esta gráfica :').
Answers
Answer:
ANO BA TO?(;-;)
Explanation:
miss the rage??
hey guys can y’all help quickly?
how to induce a positive temporary charge on the right side of a metal ball
Answers
Answer:
Temporary? You have two options
If you have a positively charged object, bring it close to the LEFT side of the ball (not touching it!).
If you have a negatively charged object, bring it close to the RIGHT side of the ball (again, not in contact).
Either way, the electron cloud will migrate towards the right side of the of your sphere.
Another option is to have a capacitor large enough to house the sphere inside it, and polarize it by attaching it to a DC source making sure that the negative plate of it is to the right of the sphere.
a girl swims along the length of 80m in swimming pool and comes back in 1.5sec. find her distance and displacement
Answers
the distance is the first 80m+the second 80m she came back. So the distance is 160m. but the displacement is 0, because she came back by the direction she went.
Does the addition od 5N forces always give a 10 N force?
Answers
=5+10=15N and F
min
=10−5=5N
Range of resultant 5≤F≤15
therefore , 4N can't be the resultant of these two force
Write a one paragraph essay about the importance of the different biomolecules in our life.
Answers
Answer:
#tried my bestt
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Biomolecules are made by living organisms and they are made because they are functional. Biomolecules, or at least most of them, do not exist outside of living organisms because they are too complex to be created by chance chemical collisions. The odds of a single average sized protein to form by chance has been calculated at 1 out 10 to the 77th power. Biomolecules REQUIRE intelligent agency to form them.
The four main purposes of biomolecules are:
1. Structure (some proteins)
2. Energy storage and release (carbohydrates)
3. Protective layers (lipids)
4. Information storage and communication (DNA, RNA, endocrines of numerous various types and manipulated molecules, such as fatty acids)
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what is 5.6 x 10^15 converted to x10^12
Answers
Answer:
5,600
Explanation:
You split x10^15 into x10^12 and x10^3. Our new equation is 5.6x10^3x10^12
We do 5.6x10^3 and we get 5,600. Our new equation is 5,600x10^12. I hope this answered your question.
What type of wave vibrates parallel to the direction of travel
Answers
Answer: Longitudinal waves
Explanation: For a sound wave traveling through air, the vibrations of the particles are best described as longitudinal. Longitudinal waves are waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport
if a curve is banked to accommodate cars traveling at 15 m/s, what will happen during an ice storm (no friction with the road) to a car moving at a slower speed?
Answers
A automobile will have trouble while going through a curve when there is little friction between the car's tyres and the road during an ice storm and the banking of the road allow vehicles to move at 15 m/s.
The lack of friction will still cause the car to tend to slide towards the outside of the curve even though it is going more slowly. If the car slides off the road or into oncoming traffic, it might be very dangerous.
When the surface of a curving road is inclined towards the horizontal to generate the required centripetal force for a safe turn, the phenomenon known as "banking of roads" takes place.
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Do you remove the positive or negative first on a car battery?
Answers
Answer:
negative at first.
Explanation:
It's important to disconnect the negative side at first, otherwise you can cause an electrical short if positive is removed first.
If the bar magnet moves away from the loop, in which direction should the induced current go in the most illuminated part of the loop (upward or downward) and argue in detail why you indicated that direction.
Answers
The induced current in the most illuminated part of the loop should flow downward (or inward) to create a magnetic field into the page and oppose the decrease in the magnetic field caused by the moving bar magnet.
When a bar magnet moves away from a loop, the change in magnetic field induces an electric current in the loop according to Faraday's law of electromagnetic induction. The direction of the induced current can be determined using Lenz's law.
Lenz's law states that the direction of the induced current is such that it opposes the change that produced it. In other words, the induced current creates a magnetic field that tries to counteract the change in the magnetic field that caused it.
In this case, as the bar magnet moves away from the loop, the magnetic field through the loop decreases. To oppose this decrease, the induced current will create its own magnetic field that points in the opposite direction of the decreasing magnetic field.
To determine the direction of the induced current in the most illuminated part of the loop (assuming the loop is a closed circuit), we can use the right-hand rule for current-carrying conductors.
If we curl the fingers of our right hand in the direction of the decreasing magnetic field (which is out of the page as the magnet moves away), the induced current should flow in the direction opposite to the direction our thumb points.
In this case, since the bar magnet is moving away, the induced current in the loop should flow in a direction such that it creates a magnetic field that opposes the magnet's motion. According to the right-hand rule, this means the induced current should flow in a direction that creates a magnetic field directed into the page.
In terms of the illuminated part of the loop, if the magnet is moving away, the most illuminated part is the side of the loop that faces the magnet as it moves away. The induced current in this part should flow in a direction such that it creates a magnetic field into the page.
Therefore, the induced current in the most illuminated part of the loop should flow downward (or inward) to create a magnetic field into the page and oppose the decrease in the magnetic field caused by the moving bar magnet.
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How much work is done if you push a couch 10m across the floor with 5N of force?
Answers
Work = Force * Distance = 5N * 10m = 50Nm
Force: 5NDistance: 10mHope it helps!
1) Andrew wanted to watch his dog run to see how fast he can to see what 1 point
his speed was. When his dog started running, he measured the distance of
17 meters in 9 seconds. What was his dog's speed?*
Answers
Answer:
Andrew's dog's speed was 1.89 m/s
Explanation:
Motion at Constant Speed
An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.
This can be written as the formula below:
\(\displaystyle v=\frac{d}{t}\)
Where
v = Speed of the object
d = Distance traveled
t = Time taken to travel d.
Andrew's dog run a distance of d=17 meters in a time of t=9 seconds, thus its speed was;
\(\displaystyle v=\frac{17}{9}\)
v = 1.89 m/s
Andrew's dog's speed was 1.89 m/s
Where do you find energy
Answers
Answer: nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and hydro power
Explanation:
Energy can be in many forms like the ones I stated but the sun is probably the biggest source also and play's a big part.
oort cloud objects will only pass close to earth and become comets if their orbits are:
Answers
Oort cloud objects will only pass close to Earth and become comets if their orbits are influenced by gravitational interactions with nearby stars or other celestial bodies.
These interactions can disturb their orbits, causing them to enter the inner solar system. Once they approach the Sun, the heat and radiation cause volatile materials on their surface to vaporize, creating a glowing coma and a tail. This transformation from a distant, icy object to a visible comet occurs when their highly elliptical orbits bring them within the inner regions of our solar system, allowing us to witness their spectacular displays as they pass by Earth. Oort cloud objects will only pass close to Earth and become comets if their orbits are influenced by gravitational interactions with nearby stars or other celestial bodies.
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A ship is 425 m from a perpendicular cliff at the coast. The ship's siren is sounded and an echo is heard after 2,5 s. Calculate the speed of sound from the data supplied.
Answers
The speed of sound when a echo is heard 2.5 s later is 340 m/s.
What is an echo?An echo is a sound that is repeated due to the reflection of a sound wave in a medium.
To calculate the speed of light from the data supplied, we use the formula below.
Formula:
v = 2d/t...................... Equation 1Where:
v = Speed of soundd = Distance of the from the cliff = 425 mt = Time taken to hear the echo = 2.5 sSubstitute these values into equation 1
v = (2×425)/2.5v = 340 m/sHence, the speed of sound is 340 m/s.
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Each external force acts on the system for 10 seconds. Rank the change in momentum of each of the cart-cart systems from largest to smallest. (The label of “m” or “2 m” desginates the relative mass of each cart.)
It is possible to have some of the categories below BLANK since you may have items that are EQUAL to each other.
Put the largest as far up as you can, and the smallest as far down as you can
Answers
Answer:
thanks me later
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Rock composed of many thin layers. This image appears in an Earth science magazine with this caption: "A non-foliated rock found in the Himalayan Mountains.” Is the caption for this image correct? Why or why not? Yes, because the grains are arranged in thin, parallel layers. No, because the grains are arranged in thin, parallel layers. Yes, because the grains are arranged randomly. No, because the grains are arranged randomly.
Answers
Answer:
its B
Explanation:
Answer:
It's B, No, because the grains are arranged in thin, parallel layers.
Explanation:
I literally took the test 5 seconds ago and it was right.
5. Extend: On the SPACE tab, drag the axis to 0° (straight up and down). How does this affect
seasons on the EARTH tab?
Answers
Dragging the axis to 0° on the SPACE tab will result in no transitional seasons, and the entire Northern Hemisphere will experience either continuous daylight (summer) or continuous darkness (winter), depending on the time of year.
When you drag the axis on the SPACE tab to 0°, it aligns the Earth's rotational axis perpendicular to the plane of its orbit around the sun. This means that the Earth's North Pole is pointing directly towards the sun, and the South Pole is pointing away from it.
On the EARTH tab, this change in the orientation of the Earth's axis will affect the seasons in the following ways
The summer solstice occurs around June 21st in the Northern Hemisphere when the North Pole is tilted towards the sun. However, when you drag the axis to 0°, the North Pole is pointing directly towards the sun, so the entire Northern Hemisphere experiences continuous daylight, and it is summer everywhere in the Northern Hemisphere.
The winter solstice occurs around December 21st in the Northern Hemisphere when the North Pole is tilted away from the sun. However, when you drag the axis to 0°, the North Pole is pointing directly away from the sun, so the entire Northern Hemisphere experiences continuous darkness, and it is winter everywhere in the Northern Hemisphere.
The equinoxes occur around March 21st and September 21st in the Northern Hemisphere when the axis is neither tilted towards nor away from the sun. However, when you drag the axis to 0°, the equinoxes do not occur, and there are no transitional seasons. It is either summer or winter everywhere on the Earth.
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20 pts. What type of forces do not change the motion of an object? Acceleration forces Balanced forces Inertia forces Unbalanced forces
Answers
Answer:
Balanced forces
Explanation:
Answer:
its balance force
Explanation:
If an initial cardioversion attempt is unsuccessful in a 33-pound child, you should repeat the procedure using ___ joules.
Answers
If an initial cardioversion attempt is unsuccessful in a 33-pound child, you should repeat the procedure using 30 joules.
Cardioversion
Cardioversion is a medical therapy that uses medications or electricity to restore a normal heart rhythm to someone who has an abnormally high heart rate (tachycardia) or another cardiac arrhythmia. Synchronized electrical cardioversion restores the activity of the heart's electrical conduction system by applying a therapeutic dosage of electric current to the heart at a specified point in the cardiac cycle. (Defibrillation is the most efficient form of resuscitation for cardiac arrest caused by ventricular fibrillation and pulseless ventricular tachycardia. It delivers a therapeutic dosage of electric current to the heart at an unpredictable point in the cardiac cycle. Chemical cardioversion, also known as pharmacologic cardioversion, substitutes antiarrhythmic drugs for an electrical shock.
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bert and ernie are pushing on opposite sides of the box. if they can both push with the same amount of force, what is true about the motion of the box?
Answers
The box will be in rest due to net force applied on it is zero.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Given that Bert and Ernie are pushing on opposite sides of the box with force of same magnitude, let it be F.
So, net force acting om the force = F-F = 0.
As that net force acting on the box is zero, the box will be in rest.
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keratometry measures the curvature of the cornea by treating the cornea as a mirror. does the cornea act as a positive or negative mirror?
Answers
The radius of curvature of the cornea is measured using the fact that the cornea's front surface serves as a convex mirror.
The Corneascope was less accurate and precise than the Keratometer and Corneal Modeling System.
What does keratometry look for?Keratometry is the measuring of the curvature of the anterior corneal surface across a predetermined chord length of 2 to 3 mm that falls inside the cornea's spherical optic zone.
The orientati of the corneal astigmatism is defined by the main and minor axes of this ellipse. Keratometry is generally measured along these two orthogonal meridians in this example, yielding the greatest and minimum corneal power. These extremes are referred to as K-values or corneal Ks.
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please help! need a answer as quick as possible please. i need help with questions 1 and 2 ! thank you
Answers
Answer:
1.)When you arrive from school and you smell cookies baking in the kitchen your brain will tell you that you are hungry and that you should go to the kitchen at that point your sense organs like your nose helps you to detect that something is baking(cookies)and your nervous system (brain)will tell you that you are hungry and it will command/direct your brain to go to the kitchen then for you to eat the cookies and drink the milk the digestive system is going go help you to chew,swallow and digest the food which has been taken and when you also run to the kitchen at the beginning your brain will direct your skeletal and muscular system because the skeletons and muscles work hand in hand,and when you finish your meal the body will circulate some nutrients or minerals from the food or snack taken to other parts of the body for energy.
2.)When you sleep the whole body is asleep except the heart which needs to continue circulating blood around the whole system and sometimes the brain may not rest when you are sleeping it may continue to do it's work that's why some people usually sleep walk or sleep talk,it means the brain is not at rest and still doing some things....Thank you for the question I hope it is very useful to you.
an object is thrown straight up with an initial velocity of 20.0 m/s, and there is an air resistance force which would cause an acceleration of 3.00 m/s2 opposite the direction of motion. with what speed does the object return to the ground?
Answers
As the object is thrown up with the initial velocity of 20.0 m/s, and there is an air resistance force that would cause an acceleration of 3.00 m/s2, the speed of the object as a return to the ground is 10.8 m/s.
Kinematic equations
The kinematic equations are a set of equations that describe the motion of an object with constant acceleration.
When we have an initial velocity value, it is written as Vo, while for the final velocity, we simply write V or Vt. As an object moves through the air, air resistance slows the object’s speed.
The formula of the kinematic equation used for solving this case is
Vt = V0 + at (the gravity is 10 m/s2)
\(Vt = Vo + (-g-a)t\\\0 = 20 + (-10-3)t\\0 = 20-13t\\\13t = 20\\\t = \frac{20}{13}\)
After the time is known, now we can insert the value into the following formula :
\(Vt = Vo + (g-a)t\\Vt = 0 + 7.\frac{20}{13} \\Vt = 0 + \frac{140}{13} \\\Vt = 10.8 m/s\)
Thus, the speed of the object returns to the ground after being thrown up with an initial velocity of 20.0 m/s and acceleration of 3.00 m/s2, which is 10.8 m/s.
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