A moving sidewalk has a velocity of 1.3 m/s north. If a man walks south on
the sidewalk at a speed of 0.9 m/s, how long does it take him to travel 20 m
relative to a stationary observer?
O A. 21.9 s
O B. 15.4 s
O C. 33.3 s
O D. 50.0 s
Please please help!!!
What kinds of bonds make up a formula unit of sodium chloride?
a.
Ionic bonds
b.
Covalent bonds
c.
1 ionic bond and 1 covalent bond
d.
Van der Waals forces
Answer:
a.ionic bond is kinds of bonds make up a formula unit of sodium chloride.
Answer:
A
Explanation:
how jolibee mascot move their eyes?
Answer: i think they control the eyes to move them.
Explanation:
Who may perform a post-exposure medical evaluation?
A) A licensed physician
B) An LPN
C) A physician's assistant
D) Your employer
Answer:a licensed physician
Explanation: taking the osha test now.
A licensed physician is the one to carry out a post-exposure medical evaluation. (Option A)
Post-Exposure Medical EvaluationPost-exposure Medical Evaluation is any medical evaluation started after exposure to a pathogen in order to prevent the infection from occurring.
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To calculate acceleration you must know both the objects velocity and_____
You need to know the time as well.
a cycle lasts for 8 seconds. what is the frequency
This frequency definition leads us to the simplest frequency formula: f = 1 / T . f denotes frequency and T stands for the time it takes to complete one wave cycle measured in seconds. The SI frequency unit is Hertz (Hz), which equals 1/s (one cycle per second)
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Hope It Helps!
Find focal length of a concave mirror having 40 cm radius of curvature
Answer:
The focal length of the given spherical mirror is 20cm.
Explanation:
plz follow me
hii please help i’ll give brainliest if you give a correct answer please
Answer:
they are equal and act in opposite directions
Explanation:
newton's third law of motion states that if object A exerts a force on object B, then object B will exert an equal but opposite in direction force.
hope it helps, I think my response was late,
What unit of time on Earth is based on the revolution of the Earth around the Sun?
A.
day
B.
hour
C.
year
D.
month
C.) Year
i hope this helped! please mark me as brainliest and 5 stars >:)
Answer:
I believe it's C. Year.
Explanation:
Hope this helps! ^^
3. A 6 kg block moving to the right at 4 m/s collides with and sticks to a stationary block of unknown mass. If the two blocks move off to the right at 3 m/s, what was the mass of the stationary block?
Answer: 2kg
Explanation:
This problem is a textbook conservation of momentum problem. The intial momentum is equal to the final momentum. For the initial state of each block, only the first one was moving. Then they both combine to move together.
Pi = Pf
with p = mv
(6kg)*(4m/s) = (6kg+xkg)(3m/s)
Let x equal the unknown mass of block 2
24 = 18 + 3x
6 = 3x
x = 2kg
A 3000 kg truck travelling at 50km/hr strikes a stationary 1000 kg car, locking the two vehicles
together. What is the final velocity of the two vehicles?
(Please show work)
Answer:
50 x 3000 = 150000/4000 = 37.5
37.5 I think.
Explanation:
Hope this helps!
A 3000 kg truck travelling at 50km/hr strikes a stationary 1000 kg car, locking the two vehicles together, the final velocity of the two vehicles after the collision is approximately 10.43 m/s.
We may use the concept of conservation of momentum to calculate the final velocity of the two vehicles after the collision.
The total initial momentum (P_initial) is given by:
P_initial = (mass of truck) * (initial velocity of truck) + (mass of car) * (initial velocity of car)
P_initial = (3000) * (50) + (1000) * (0)
The velocity:
Vt = 50 * (1000/3600) = 13.9 m/s
Vc = 0 = 0 m/s
P_initial = (3000) * (13.9) + (1000) * (0 )
P_initial = 41700 kg·m/s
P_initial = P_final
41700 kg·m/s = (3000 kg + 1000 kg) * Vf
41700 kg·m/s = 4000 kg * Vf
Now Vf:
Vf = 41700 kg·m/s / 4000 kg
Vf ≈ 10.43 m/s
Therefore, the final velocity of the two vehicles after the collision is approximately 10.43 m/s.
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The chemical symbol for nitrogen is
A Na
B Ni
Ne
DN
The chemical symbol for nitrogen is N
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Chemical symbol for nitrogen is :
D.) " N "Please explain in detail and step by step
Explanation:
Irfan should take care that the mirror has to be 1/2 of his height and it is
there is not any other specification to be looked at and irfan's height is 180 cm
Can someone help me with this question
Answer:
extrusive igneous rock
PLEASE HELP I'LL MARK BRAINLIEST
Answer:
B
Explanation:
Define potential energy (PE)
Answer:
Potential energy is the energy that exists by virtue of the relative positions (configurations) of the objects within a physical system.
This form of energy has the potential to change the state of other objects around it, for example, the configuration or motion.
Various forms of energy can be grouped as potential energy.
Each of these forms is associated with a particular kind of force acting in conjunction with some physical property of matter (such as mass, charge, elasticity, temperature etc).
For example, gravitational potential energy is associated with the gravitational force acting on object's mass; elastic potential energy with the elastic force (ultimately electromagnetic force) acting on the elasticity of a deformed object; electrical potential energy with the coulombic force; strong nuclear force or weak nuclear force acting on the electric charge on the object; chemical potential energy, with the chemical potential of a particular atomic or molecular configuration acting on the atomic/molecular structure of the chemical substance that constitutes the object; thermal potential energy with the electromagnetic force in conjunction with the temperature of the object.
For an example of gravitational potential energy, consider a book placed on top of a table.
To raise the book from the floor to the table, work must be done, and energy supplied. (If the book is lifted by a person then this is provided by the chemical energy obtained from that person's food and then stored in the chemicals of the body.) Assuming perfect efficiency (no energy losses), the energy supplied to lift the book is exactly the same as the increase in the book's gravitational potential energy.
The book's potential energy can be released by knocking it off the table.
As the book falls, its potential energy is converted to kinetic energy.
When the book hits the floor this kinetic energy is converted into heat and sound by the impact.
Explanation:
Answer:
potential energy is basically stored energy
Explanation:
An object initially traveling at 20.0 m/s south decelerates uniformly at 6.00 m/s2 and is displaced 25.0 m. What is the final velocity of the object? (magnitude and direction)
Answer:
50.37 m/s and 40ms object
I don’t get this pls help
Answer:
What do you need help with?
Within a few sentences, explain the difference between meiosis and mitosis.
What is another name for the rare earth elements?
a.
Group 1
c.
Group 6
b.
Lanthanide
d.
Alkaline Earth
Explanation:
lanthanide is another name for the rare earth
elements.
Answer:
use common sense
Explanation:
Use what you have learned in the reading to answer the following question. The point of a compass needle points to Earth’s north pole. The point in the compass needle has–
~the same polarity as Earth's north pole.
~the opposite polarity from Earth’s north pole.
~no polarity.
~unlimited polarity.
The point in the compass needle has the opposite polarity from Earth’s north pole. The correct option is B.
What is a compass needle?The compass needle A magnetized pointer within a compass that can freely align with the Earth's magnetic field.
The magnetic needle is the most important part of the compass. It swings around the compass as you move, but the red end always points north and the white (or sometimes black) end always points south.
If you mean the geographical North Pole, the needle would point south because that is the only way to get there; more specifically, it would point south along the 112.4 degrees west longitude meridian towards the magnetic north pole at 82 degrees north, where compasses point.
Thus, the correct option is B.
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Which of the following was NOT a department in Washington's first cabinet?
A. Secretary of State
B. Secretary of Homeland Security
C. Secretary of War
D. Secretary of Treasury
Answer:
I believe its C: Secretary of War. I hope this helped :)
Explanation:
Secretary of Homeland Security was not a department in Washington's first cabinet. So, the correct option is B.
What is Washington's cabinet?George Washington created the nation's first cabinet, made up of the president's most trusted advisers, where advisers advise the president on laws, taxes, foreign affairs, defense, and other important issues on how to govern the United States.
George Washington's first cabinet was consists of attorney and postmaster generals and secretaries of state, treasury, and war. This cabinets included four original members which are as follows: Secretary of State Thomas Jefferson, Secretary of Treasury Alexander Hamilton, Secretary of War Henry Knox, and Attorney General Edmund Randolph.
Therefore, the correct option is B.
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Which of the following objects have gravitational potential energy?
A) a diver standing on a diving platform.
B) A hockey puck gliding across the ice.
C) an archers bow that is drawn back.
D) A runner waiting on the starting blocks.
Answer:
An archers bow that is drawn back
Answer:
A)a diver standing on a diving platform.
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Se usa una bombona de He para inflar globos, de volumen 15L con una presión de 200 atm. Si los globos tienen un volumen de 1.5L y presión de 770mmHg. ¿Cuántos globos se pueden llenar?
Answer:
La cantidad de globos llenos es de aproximadamente 1.974 globos
Explanation:
Los parámetros dados son;
El gas utilizado para inflar el globo = Él
El volumen del gas He, V₁ = 15 L
La presión del gas He, P₁ = 200 atm = 20,265,000 Pa
El volumen de cada globo = 1,5 L
La presión del He dentro del globo, P₂ = 770 mmHg = 102,641 Pa
Sea 'V₂', que represente el volumen total que el gas ocupa en todos los globos, y 'x', que represente el número de globos;
Por lo tanto, tenemos;
1,5 · x = V₂
Según la ley de Boyle, tenemos;
P₁ · V₁ = P₂ · V₂
∴ V₂ = P₁ · V₁ / (P₂)
Al introducir los valores conocidos, obtenemos;
V₂ = 20,265,000 Pa × 15 L / (102,641 Pa) = 2,961.53548 L
1,5 L × x = V₂
∴ 1,5 L × x = 2,961,53548 L
x = 2,961.53548 L / (1.5 L) = 1,974.35699 redondeamos hacia abajo para obtener un número entero de globos de la siguiente manera;
El número de globos, x ≈ 1,974 globos.
1. Two magnets are placed on a table, and they immediately move to attach to each other. Which statement is correct about the energies in the system?
Kinetic energy is at its peak when the magnets are first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.
The kinetic energy of the system is derived from the thermal energy created by increased velocity. Energy stored in the magnetic field does not change.
Kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases.
The velocity and kinetic energy of the system increase as the energy stored in the magnetic field increases.
2. Two magnets are placed on a table, and they immediately move to attach to each other. Which statement is correct about the energies in the system?
The energy stored in the system is converted to kinetic and thermal energy.
The energy stored in the system is converted to kinetic energy.
The energy stored in the system is converted to kinetic, thermal, and sound energy.
The energy stored in the system is converted to thermal and sound energy.
3. A magnet is moved close to a rubber band. How does the energy stored in the magnetic field change?
The energy stored in the magnetic field increases.
The energy stored in the magnetic first increases and then decreases.
The energy stored in the magnetic field does not change.
The energy stored in the magnetic field decreases.
4. Two donut-shaped magnets are stacked on top of each other with a wooden dowel in the center. The south poles of the magnets are facing each other. Once the upper magnet is released, it accelerates downward and stops 1 cm above the lower magnet. How does the energy stored in the magnetic field change?
All of the energy stored is converted into kinetic, thermal, and gravitational energy.
Some of the energy stored is converted into kinetic, thermal, and gravitational energy.
All of the energy stored is converted into kinetic and thermal energy.
Some of the energy stored is converted into kinetic and thermal energy.
According to the law of conservation of energy, energy can neither be created nor destroyed but is transformed from one form to another.
1) The statement that is true about the magnets involved is that; "kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases."
2) In the second question, the statement that is correct about the energies of the system is that the energy stored in the system is converted to kinetic energy.
3) When a magnet is moved close to a rubber band, the energy stored in the magnetic field does not change.
4) In the fourth question, some of the energy stored is converted into kinetic, thermal, and gravitational energy.
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Answer:the correct answer is: the energy stored in the system is converted to kinetic, thermal and sound energy
Explanation:
Review the poster.
https://www.cdc.gov/handwashing/pdf/wash-your-hands-fact-sheet-508.pdf
Which statement best describes the purpose of the “Stop Germs! Wash Your Hands” poster?
to inform people of when, how, and why to wash their hands
to entertain people with a how-to demonstration
to describe the sensory experience of washing hands
to persuade people to engage in more healthy hygiene practices
Answer: A, to inform people of when, how, and why to wash their hands.
Explanation: in the poster it shows when you should wash your hands, how you should wash your hands, and why its important to wash your hands! Please give brainliest!
The statement on the CDC poster is meant to to inform people of when, how, and why to wash their hands.
Why hand washing?Hand washing is a very important way of stopping the spread of infectious diseases. We saw this especially during the pandemic when there was a wider call for hand washing.
The statement “Stop Germs! Wash Your Hands” on the CDC poster is meant to to inform people of when, how, and why to wash their hands.
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When water waves meet, they can combine to form new waves. In constructive waves, a ________ amplitude wave is formed. In destructive waves, a wave with a __________ amplitude is formed. A) greater, smaller B) smaller, greater C) smaller, smaller D) greater, greater
Answer:
In constructive waves, a greater amplitude wave is formed. In destructive waves, a wave with a smaller amplitude is formed. (option A)
Explanation:
Interference is called the superposition or sum of two or more waves. Depending mainly on the wavelengths, amplitudes and the relative distance between them, there are two types of interference: constructive or destructive.
Constructive interference occurs when there are two waves of identical or similar frequency (both have motions equal to an even number of similar wavelengths) and overlap the peak of one with the peak of the other. These effects add together and make a wave of greater amplitude. All of this is possible because the waves were in the same phase in the beginning (in the same position).
Destructive interference occurs in the opposite case to constructive. When the crest of one wave overlaps the valley of the other, they cancel out since they are in different phases when they overlap (they were in different positions). That is, as in the case of constructive waves they were added, in the case of destructive waves they cancel out (subtract).
So, In constructive waves, a greater amplitude wave is formed. In destructive waves, a wave with a smaller amplitude is formed.
in what way is Speed related to Kinetic Energy?
Answer:
Explanation:
In order to find kinetic energy, you need information about the velocity. Speed is the magnitude of the velocity.
Kinetic energy is 1/2mv^2
m being mass
v being velocity
The kinetic energy of an object is directly proportional to the speed of the object. If we double the speed of the object then the kinetic energy of the object will increase by a factor of four or four times.
What is Kinetic energy?Kinetic energy is the energy which is present in an object which has because of its motion. If we want to accelerate an object, then we must apply the force of some magnitude. Applying a force, requires us to do some work. After the work has been done, then the energy has been transferred to the object, and the object will be moving with a new constant speed.
Kinetic energy is directly proportional to the mass of the object and to the square of its speed or velocity:
K.E. = 1/2 m × v²
If the mass has the units of kilograms and the velocity of meters per second, then the kinetic energy has units of kilograms-meters squared per second squared.
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If the current is 10 amps and the voltage source is 200 volts,
what is the resistance?
Answer:
4,000
Explanation:
Answer:
2000
Explanation:
Select the correct sequence of steps for lighting a Bunsen burner?
A. Apply the spark above the barrel of the Bunsen burner.
B. Open the gas adjustment at the base of the Bunsen burner.
C. Connect the burner hose to the gas outlet.
D. Open the gas valve on the gas outlet
D. C, A, B
C, A, D, B
C, D, A, B
C, D, B, A
Answer:
CDBA
Explanation:
Just did it on Study island
The correct sequence of steps for lighting a Bunsen burner would be C, D, B, A, therefore the correct answer is option D.
What is thermal energy?Thermal energy sometimes referred to as heat energy, may be described as the type of energy in which heat is transmitted from one body to another body as a result of their molecular motions.
The following would be the proper procedure for lighting a Bunsen burner:
Link the gas outlet and the burner hose.
The gas output valve should be opened.
Open the Bunsen burner's base-mounted gas adjustment valve.
The Bunsen burner's barrel should be covered with the spark.
Thus, the right response is option D since the proper stages to ignite a Bunsen burner are C, D, B, and A.
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