Answer:
B protons
Explanation:
- The atomic number of a nucleus (often labelled with Z) is the number of protons inside the nucleus
- The mass number of a nucleus (often labelled with A) is the sum of the protons and the neutrons inside the nucleus
- The number of electrons in a neutral atom is equal to the number of protons inside the nucleus
Therefore, the correct answer is
B protons
However, A (electrons) could also be considered correct if we are talking about a neutral atom.
What components are needed in an experiment?
Answer:
A Hypothesis, and a control variable.
Explanation:
John's truck has more mass than his brother Thomas' truck. John's truck
has less inertia
will accelerate more quickly
needs more force to move
is 100 percent efficient
Final answer:
A truck with greater mass has more inertia and needs more force to achieve the same acceleration as a lighter truck. A heavier truck does not have less inertia, nor can it be 100 percent efficient in terms of energy use.
Explanation:
Based on Newton's laws of motion, particularly the second law which states that force equals mass times acceleration (F = ma), it is clear that an object with more mass will have more inertia. Inertia is the resistance of any physical object to any change in its velocity. A truck with more mass than another will inherently have more inertia, not less, because inertia is directly proportional to mass.
Because of this direct proportionality, a truck with more mass will also need more force to move or accelerate at the same rate as a lighter truck. This is also why heavier objects accelerate slower than lighter ones when the same force is applied. Regarding efficiency, no machine or vehicle, including trucks, can be 100 percent efficient due to the second law of thermodynamics, which says that some energy is always lost in the form of heat or other non-usable forms during energy transfers.
what are the effect of propagation of light
The propagation of light describes how light spreads out from a source and diminishes in intensity with distance, following the inverse square law. This concept is vital in fields like sample analysis and lithography. Understanding light propagation is essential for theoretical and practical physics and technology applications.
The propagation of light is an essential concept in physics with significant implications. When light travels from a source, such as a lightbulb, it expands in all directions, covering an ever-widening area. Because the total amount of light doesn't change, the amount of light in any given place decreases as the distance from the source increases, illustrating the inverse square law.
This weakening of light intensity has various practical applications:
Sample Analysis: In scientific research, when a sample is illuminated, and its scattered light is measured, the detected light is affected by both the sample and the propagation effects. Lithography: When printing patterns onto substrates using a mask, the light reaching the photoresist is altered by propagation. Therefore, masks must be designed to account for this to ensure the correct pattern is transferred.Additionally, the wave-like nature of light is crucial in understanding interference and diffraction, as evidenced by the double-slit experiment. This experiment demonstrated that light behaves as a wave, creating observable interference patterns.
Overall, understanding how light propagates is vital for theoretical science and practical applications in technology and industry.
The speedometer in your car reads 55 mi/h. This represents the _____ of the car.
The mileage of the car how fast it is going
The speedometer in your car reads 55 mi/h. This represents the Instantaneous speed of the car.
Explanation:
Speed is a measurement of distance and time. Speedometers have been installed in vehicles to indicate the speed at which the driver drives the vehicles and control is also been used in few vehicles for the safety of the passengers like in school buses. When the car reads a reading in the speedometer, it denotes the instant speed of the car rather than the average speed.
two tenses R1 and R2 are connected in parallel across a supply. what is the ratio of heat produced in resistances R1 and R2.
**please tomorrow is my exam,
if you answer I'll mark you brainliest
Answer with explanations:
V=I1*R1=I2*R2 (when R1 and R2 are connected in parallel)
Therefore, rearranging above, I1/I2=R2/R1
Heat produced = I^2R
Ratio of heat produced by R1 and R2
= (I1^2*R1) / (I2^2*R2 )
= (I1/I2)^2 * (R1/R2)
= (R2/R1)^2 * (R1/R2)
= R2/R1
Help! ASAP
Which of the following is a circular wave?
Answer:
Graph B.
Explanation:
it is a wave, they are fun to watch
If you want to know how energy will move between two objects, what do you
need to know about the objects?
A. Their densities
B. Their heats
c. Their temperatures
D. Their states
Answer:
I believe it is C. Their Temps.
Explanation:
Hope my answer has helped you!
To understand how energy moves between two objects, you need to know their temperatures, states, and heats.
Explanation:In order to determine how energy will move between two objects, you need to know their temperatures, states, and heats. Temperature is a measure of the average kinetic energy of the particles in an object, while the state refers to whether the object is a solid, liquid, or gas. Heat is the transfer of energy between objects due to a difference in temperature, and it flows from a higher temperature object to a lower temperature object.
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49. The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. At this
point it comes to its leftmost position. What is its kinetic energy at this point?
A. -0.3 J
B. zero
C. 0.3 J
D. 375 N/m
Answer:
B. zero
Explanation:
The total mechanical energy of a spring is equal to the sum of its kinetic energy, K, and its potential energy, U:
[tex]E=K+U[/tex]
Where
[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy, where m is the mass and v is the speed
[tex]U=\frac{1}{2}kx^2[/tex] is the potential energy, with k being the spring constant and x the displacement
The total mechanical energy is conserved during the entire motion of the spring. We have two particular situations:
- At the equilibrium position, the displacement is zero: x=0, so U=0 and the kinetic energy is maximum.
- At the position of maximum displacement (so the leftmost or rightmost position), the displacement is maximum, so U is maximum while the speed is zero (v=0), and therefore the kinetic energy is also zero: K = 0.
Therefore, the correct answer is
B. zero
Which of the following could be classified as matter? Check all of the boxes that apply.
Answer: desk, water, helium and clouds
Explanation:
Answer:
Desk
Water
Cloud
Helium
Explanation:
Edge 2023
A piece of blue paper appears blue because the paper
a. reflects all colors of light except blue
b. absorbs all colors of light except blue
c. refracts all colors of light except blue
d. is transparent to all colors of light except blue
A piece of blue paper appears blue because the paper absorbs all colors of light except blue. (b)
So any light that bounces off of the paper and enters your eye must be blue light !
A piece of blue paper appears blue because the paper b. absorbs all colors of light except blue
What is meant by absorption of light ?
The absorption of light makes an object dark or opaque to the wavelengths or colors of the incoming wave
When an object receives light, it absorbs some wavelengths and reflects others. The ones it reflects are the ones we see as color hence , correct answer will be b. absorbs all colors of light except blue
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Acceleration is a vector quantity
Acceleration is a vector quantity because it has both magnitude and direction.
Acceleration is a vector quantity that describes how an object's velocity changes over time in both magnitude and direction. It has both magnitude and direction, making it a vector, and is measured in meters per second squared.
Explanation:Acceleration is a vector quantity which means that it has both magnitude and direction. Acceleration provides information about how the motion of an object changes over time. It is always in the same direction as the change in velocity, which is also a vector. Since velocity can change in magnitude (speed) or direction, acceleration can be a change in speed, direction, or both. The SI unit for acceleration is meters per second squared (m/s²). An important aspect to note is that acceleration does not convey the actual velocity of the object; it only describes how the velocity is changing.
An example for curvilinear motion.
Ball thrown into the air at an angle.
Exposure to what type of radiant energy is sensed by human skin as warmth?
gamma rays
infrared
X-rays
ultraviolet
Answer:Another name for heat energy is... Infrared waves. These cannot be seen by your eyes but can be felt by your skin. ... Gamma Rays. ... Which type of electromagnetic radiation can result in sunburns and skin cancer? Ultraviolet Radiation ... X Rays. What is the distance between one point of a wave to the same point in the ...
Answer:
INFRARED
Explanation:
I TOOK THE TEST
~ K12 STUDENT
8TH GRADE
GOOD LUCKK!! :)
Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?
Answer:
I think it i either the 1st one with all the arrows pointing to the ball because it has some speed so it is going fast horizontally 2) the ball has to stay on the ground so that's where the gravitational pull comes in (the arrow pointing down and pointing up). 3) when the ball is moving horizontally the air which is pushing the ball from the left pushes it back a little hence slowing it a little.
Explanation:
This is my guess anyways, feel free to choose this answer my second opinon was the second one which is the one with the arrow pointing down and arrow pointing right and left ( the one which says movement of the ball )
Answer:
Option A)
Explanation:
Here we know that ball is moving horizontally so the force on the ball perpendicular to the plane must be balanced
We can say that gravitational force "mg" is balanced by the normal force due to ground. Which shows that two equal and opposite arrows must be there on ball in vertical direction.
Now in horizontal direction there may be unbalanced force in two directions.
One of the force may be due to air drag and friction on the ground. While other force is due to some external agent.
So here correct answer is represented by first figure or we can say it is given by
Option A)
2. A person began running due east and covered 15 kilometers in 2.0 hours. What is the average velocity of the person?
Answer:
7.5 km/h (2.1 m/s) due east
Explanation:
The average velocity of the person is given by:
[tex]v=\frac{d}{t}[/tex]
where
d is the displacement
t is the time taken
In this problem,
d = 15 km is the displacement
t = 2.0 h is the time elapsed
so the average velocity is
[tex]v=\frac{15 km}{2.0 h}=7.5 km/h[/tex]
and the direction is the same as the displacement (east).
We can also convert the velocity into SI units (m/s). We have:
d = 15 km = 15,000 m
t = 2.0 h * 3600 s/h = 7200 s
[tex]v=\frac{15,000 m}{7200 s}=2.1 m/s[/tex]
Answer: the answer is 7200s
Explanation: i just now it
Please brainliest
A pendulum has 232 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?
Answer:
232 J
Explanation:
Energy is conserved. All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.
how do you rearange equations
Rearrange the equation so that the unknown variable is by itself on one side of the equals sign (=) and all the other variables are on the other side. RULE #1: you can add, subtract, multiply and divide by anything, as long as you do the same thing to both sides of the equals sign.
which of the following is not a simple machine?
A. wedge
B. screw
C. lever
D. fulcrum
Answer:
D. Fulcrum
Explanation:
A wedge is a simple machine. A screw is a simple machine. A lever is a simple machine but fulcrum is the pivot point in a lever.
watching television with the remote control in your hand which of the folling exerts the greatest gravitational force on you
Answer:
the remote
Explanation:
Answer:
the couch you are sitting on
Explanation:
What does the law of conservation of energy state about energy in a closed system?
The total amount of energy in a closed system must stay constant.
Answer:
The system's energy can not be created, or destroyed. It's transformable from one shape to another. The energy stays conserved in a closed system. It is isolated in the surrounding area.
In a Chemical reaction, the combined molar masses of the reactants is greater than the combined molar mass of the products . true or false
I believe the answer is true
In a chemical reaction, molar mass of reactants and products are equal. So the given statement is FALSE.
Explanation:
To form a new product, there occurs a reaction between the compounds and the elements then there will be no loss or gain in the mass.
This is the being stated in “Law of conversation of mass”. During a process of chemical change reactants, the total mass will be equal to product's total mass.
which has more inertia a 50kg object or a 10kg object
On Earth, water exists as
Answer:
a resource
Explanation:
people and animals drink it and it keeps use from being dehydrated.
A solid, a liquid, and a gas.
what are reactants in chemical equations? What are the Products
Answer:
Reactants are initiators of a chemical reaction whereas products are substances produced as the end of that reaction.
Explanation:
In a chemical reaction, there are two categories of substances involved: reactants and products.
The reactants are those substances utilized in a chemical reaction which undergo certain changes to produce different substances at the end of the reaction known as products.
On can write a chemical equation as:
M+N→MN, where M and N are the reactants and MN is the product.
For example,
Zn + S → ZnS
|___| ↓
Reactants Products
As you can notice when writing a chemical equation, reactants are always written on left hand side of the arrow and the products on the right hand side.
Calculate the total resistance for ten 120 ohm resistors in series
The total effective resistance of several resistors in SERIES is just the sum of all the individual resistances.
So the effective resistance of ten 120-ohm resistors in series is
(120 + 120 + 120 + 120 + 120 + 120 + 120 + 120 + 120 + 120) .
A much easier way to write it is . . . (10) x (120) .
Total effective resistance = 1,200 ohms .
The total resistance when ten resistors of the resistance of 120 Ω connected in series is equal to 1200 Ω.
How to calculate the effective resistance of resistors connected in series?In a series combination of resistors, the resistors are connected end-to-end. Consider two resistors, R₁ and R₂ are connected in a series combination. If two resistors are connected in series, then their effective resistance will be given by:
Total Resistance, R = R₁ + R₂
In a series connection of resistors, the current will flow through one resistor and then through another resistor. The same current flows through every resistor in one direction. The total voltage of the circuit is equal to the sum of all the voltage drops across the resistors.
Given the resistance of each resistor = 120 Ω
The number of resistors = 10
Total resistance, R = R₁ + R₂ + R₃ + R₄ +R₅+ R₆ +R₇+R ₈ +R₉+ R₁₀
R = 10 ×120
R = 1200 Ω
Therefore, the total resistance of 10 given resistors is 1200 Ω.
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A friend doesn’t believe there are mountain ranges at the bottom of the ocean. About which of the following does he need more information
Answer:Tectonic Plates
Explanation:The ocean floor is part of the Earth's crust, which is made up of tectonic plates that all collide with eachother and form mountain ranges. Sometimes these ranges and valleys are under the ocean.
Classify the items based on whether they are or are not matter.
toothpaste
happiness
gasoline
sound
bacteria
cell
Matter: Toothpaste, Gasoline, Bacteria, Cell
Non-matter: Happiness, Sound.
Explanation:
The substances which occupies mass or volume occupying space is known as matter. It comprises of those things that can be seen through the eyes and it may include things like water, plants, food, dresses, etc. It can be defined by color or hardness.
The substances that are made of energy without occupying space is known as non-matter substances. It can be classified as form of some energy. Some examples include light energy from torch, heat energy from fire and sound energy form whistle, etc.
One can lessen the force that acts on an object
True or false
Answer:
True
Explanation:
It is possible to reduce/lessen the force that is acting on an object. For example, if you were pushing on a box and wanted to push less on the box, that would be possible.
In which area or areas on the image does the salinity of the ocean increase?
A.
1
B.
2
C.
3
D.
1, 2, and 3
E.
none of these
Answer:
d
Explanation:
i took that test
In the area 1, 2, and 3 on the image does the salinity of the ocean increase. Option D is correct.
What is ocean sanity?Seawater is salty due to a variety of substances. The majority of them arrive via rivers, which bring chemicals dissolved from rock and soil. The most common is sodium chloride, also known as salt.
Salinity makes water colder and denser by lowering its temperature. The chilly water sinks to the ocean's depths. Slow currents carry it throughout the marine basins.
So the events that may occur when ocean salinity increases will be;
1)The mass of water increases.
2) Freezing point of water decreases.
3) buoyancy of objects in the water increases.
In the area 1, 2, and 3 on the image does the salinity of the ocean increase.
Hence, option D is correct.
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Which sector is not part of the circular flow model of the economy ?
A. Government sector
B.business sector
C.consumer sector
D.market sector
Answer:
a government sector
Explanation:
Among the given, the sector which ic not a part of the circular flow model of the economy is government sector. The flow includes the business sector, markets and households.
What is circular flow model of economy ?The circular flow model shows the movement of money in society. Money is sent back and forth between producers and employees in the form of wages and payments for goods. An economy is essentially an unending circle of money flow.
The model is constructed in this manner, but actual cash flows are more intricate. To more accurately represent the complex modern economies, economists have included extra variables.
Understanding the flow of money throughout an economy is the fundamental goal of the circular flow model. It divides the economy's major stakeholders into two groups: families and companies.
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