A skater goes down a hill with a constant acceleration of 2.25 m/s2 for 50 meters. If the skater's final velocity was 20 m/s, calculate her initial velocity.
Answers
Answer:
The initial velocity of the skater is 13.22 m/s.
Explanation:
Given that,
Acceleration of the skater,
Distance covered, d = 50 m
The skater's final velocity was, v = 20 m/s
We need to find the initial velocity of the skater. It can be calculated using third equation of motion as :
So, the initial velocity of the skater is 13.22 m/s. Hence, this is the required solution.
Learn more,
Kinematics
https://brainly.in/question/10299229
Answer:
Vi = Vf - (a * t) just plug this in.
Vi stands for “initial velocity”
Vf stands for “final velocity”
a stands for “acceleration”
t stands for “time”
Related Questions
When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball? The change in momentum increases because the impact time increases. The change in momentum decreases because the force decreases. The change in momentum stays the same because the ball still comes to a stop. The change in momentum depends on the initial speed of the ball and the time to stop.
TRUE or FALSE. According to universal gravitation, both mass and air resistance affect the gravitational attraction between objects.
A signal from the nervous system that is sent from the brain to the hand would follow a different pathway than a signal sent from the hand to the brain.
Doubling the voltage in a circuit doubles the current if what is held constant?
Answers
B) The particles have sufficient energy to become an ionized gas and are in the most common state of matter in the universe.
C) The particles are not able to move out of their positions relative to one another, but do have small vibrational movements.
D) The particles are not bound to one another, move quickly, have a low density, and are able to spread apart from one another if unconstrained.
Brad and Matt are working in the lab. They noticed that when they mixed two dilute solutions together, the reaction between them happened very slowly. Which of Matt's suggestions would BEST help to increase the rate of this reaction?
A) increase the concentration of both solutions
B) decrease the concentration of both solutions
C) increase the concentration of one of the solutions
D) decrease the concentration of one of the solutions
Identify the correct order of increasing intermolecular force of attraction for the three most common states of matter.
A) liquid → solid → gas
B) solid → liquid → gas
C) gas → liquid → solid
D) gas → solid → liquid
Answers
C) The particles are not able to move out of their positions relative to one another, but do have small vibrational movements.
In solids, in fact, particles are bound together so they cannot move freely. However, they can move around their fixed position with small vibrational movements, whose intensity depends on the temperature of the substance (the higher the temperature, the more intense the vibrations). For this reason, we say that matter moves also in solid state.
2) The correct answer is
A) increase the concentration of both solutions
In fact, when we increase the concentration of both solutions, we increase the number of particles that react in both solutions; as a result, the speed of the reaction will increase.
3) The correct answer is
C) gas → liquid → solid
In gases, in fact, particles are basically free to move, so the intermolecular forces of attraction are almost negligible. In liquids, particles are still able to move, however the intermolecular forces of attraction are stronger than in gases. Finally, in solids, particles are bound together, so they are not free to move and the intermolecular forces of attraction are very strong.
Answers
Answer:
The purpose of a core in an electromagnet is to enhance the magnetic field strength produced by the electromagnet. The core is typically made of a ferromagnetic material, such as iron or steel, that can easily magnetize and demagnetize.
When an electric current flows through a wire wrapped around the core, a magnetic field is generated. This magnetic field is concentrated and strengthened by the core material. The core acts as a pathway for the magnetic field lines to flow through, making the electromagnet stronger and more efficient.
The core helps to increase the magnetic flux density, which is the amount of magnetic field passing through a given area. By concentrating the magnetic field, the core allows the electromagnet to exert a stronger force on nearby magnetic objects, such as attracting or repelling other magnets or moving metal objects.
To visualize this, think of the core as a "magnetic conductor" that channels and focuses the magnetic field. It's like using a magnifying glass to concentrate sunlight onto a small spot, making it hotter and more intense. Similarly, the core enhances the strength of the magnetic field produced by the electromagnet.
In summary, the purpose of a core in an electromagnet is to increase the magnetic field strength by providing a pathway for the magnetic field lines to flow through. This makes the electromagnet more powerful and allows it to perform various tasks, such as lifting objects, generating electricity, or controlling mechanical devices.
Please brainlist me
Answer:
Purpose of a core in an electromagnet to increase the strength, efficiency, and size of the magnetic field.
Explanation:
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil.
The purpose of a core in an electromagnet is to concentrate the magnetic field.
The coil of wire that creates the magnetic field in an electromagnet is typically made of copper, which has a relatively low magnetic permeability. This means that the magnetic field lines tend to spread out in all directions, resulting in a weak magnetic field.
Some of the purposes of using a core in an electromagnet are:
- To increased magnetic field strength:
The core concentrates the magnetic field, resulting in a much stronger magnetic field. - To reduced size:
The core helps to confine the magnetic field, which can reduce the size of the electromagnet. - To improved efficiency:
The core helps to direct the magnetic field, which can improve the efficiency of the electromagnet.
Overall, the core in an electromagnet plays an important role in increasing the strength, efficiency, and size of the magnetic field.
B. its completely black color
C. its existence beyond the visible spectrum
D. its inevitable creation of a totally destructive Big Crunch
Nucleosynthesis began when _____ and ended when _____.
A. the Big Bang occurred; the Big Crunch occurred
B. nuclear reactions could first occur; matter had condensed into galaxies and stars
C. the cosmic microwave background radiation formed; dark energy replaced it as the dominant energy form
D. the universe had cooled enough for atoms to combine; protons and neutrons were too far apart to form nuclei
Answers
Nucleosynthesis began when the answer is option D. the universe had cooled enough for atoms to combine an ended when the answer is option D. protons and neutrons were too far apart to form nuclei.
b. chemistry.
c. astronomy.
d. epistemology.
Answers
in formula transformation
Answers
Here are the answers both ways:
3 times Y = 4w
Divide each side of the equation by 3 :
Y = (4/3) w
3xY = 4w
Divide each side of the equation by 3 :
xY = (4/3) w
Divide each side by 'x' :
Y = (4w) / (3x)