Answer:
option 2 and 4
Explanation:
The strength of frictional force depends on the types of forces involved and how hard the surfaces push together.
If the surfaces are rough, then the frictional force between two surfaces is more and if the surfaces are smooth, the frictional force between two surfaces is less.
If they push hard, it means the weight on the surface is more and thus, the normal reaction force is more.
Friction force is directly proportional to the normal reaction force, so, the friction force depends on the push.
what is brownion motion
Answer: Brownion motion is the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.
Explanation:
Brownian motion is the random movement of particles in a fluid due to their collisions with other atoms or molecules.
The circuit shown is used to control the brightness of two identical lamps. The variable resistor is adjusted until the lamps operate at their correct voltage of 3.0V
1) When the lamps operate at the correct voltage, the reading on the ammeter is 1.2A. Calculate the current in one lamp.
Since the lamps are identical, the current divides equally through them... 0.6A through each lamp.
You don't have to worry about voltage drop or the value of the resistor to make that 9 volt drop to happen. The current is divided evenly by the two lamps. If the ammeter reads 1.2 amps before the current goes into the lamps then since this is a parallel circuit, the lamps will divide up the current evenly between them.
That's another way of saying each one will get 1.2 amps /2 = 0.6 amps.
A stone is thrown at an angle of 30 degrees above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stop watch measures the stone’s trajectory time from top of cliff to bottom to be 4.8s. What is the height of the cliff?
v = initial velocity of launch of the stone = 12 m/s
θ = angle of the velocity from the horizontal = 30
Consider the motion of the stone along the vertical direction taking upward direction as positive and down direction as negative.
v₀ = initial velocity along vertical direction = v Sinθ = 12 Sin30 = 6 m/s
a = acceleration of the stone = - 9.8 m/s²
t = time of travel = 4.8 s
Y = vertical displacement of stone = vertical height of the cliff = ?
using the kinematics equation
Y = v₀ t + (0.5) a t²
inserting the values
Y = 6 (4.8) + (0.5) (- 9.8) (4.8)²
Y = - 84.1 m
hence the height of the cliff comes out to be 84.1 m
The height of the cliff if the stone’s trajectory time from the top of the cliff to bottom to be 4.8s is 84.06m
To get the height of the cliff, we will have to use Newton's second law of motion as shown below;
[tex]S=ut+\frac{1}{2}at^2[/tex]
Since the stone is thrown upwards, a = -g, the formula will become;
[tex]S=ut-\frac{1}{2}gt^2[/tex]
Get the initial vertical velocity "u"
[tex]u = u_0sin \theta\\u=12sin30^0\\u=6.0m/s[/tex]
Given the following parameters
t = 4.8secs
g = 9.8m/s²
Substitute the given parameters into the formula as shown:
[tex]S=6(4.8)-0.5(9.8)(4.8)^2\\S=28.8-112.896\\S = -84.06m[/tex]
This shows that the height of the cliff if the stone’s trajectory time from the top of the cliff to bottom to be 4.8s is 84.06m
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What causes light waves to refract?
A) The speed of light is reduced to zero.
B) The speed of light remains constant.
C) The light is repelled by some materials.
D)The speed of light changes from one medium to the next.
The speed of light Never goes to 0. A is wrong.
The speed of light in refraction does not remain constant. B is incorrect
Light does not repel. That term is reserved for something like magnetism. C is not using the correct vocabulary.
D is the right answer.
Two particles A and B are initially at distance d apart. They start moving simultaneously at velocity v and u such that A always move towards B and B moves along fixed straight line which is perpendicular to initial direction of motion of A. Then particles will meet after time
A. (vd)/(v^2-u^2)
B. (ud)/(u^2-v^2)
C. d/(v^2+u^2)^1/2
D. vd/(v^2+u^2)
Let after time "t" the Position of A and B are in such a way that A is heading to B and its velocity makes some angle with x axis
So the relative speed of A with respect to B in horizontal direction is given as
[tex]\frac{dx}{dt} = u - vcos\theta[/tex]
relative motion in y direction is given as
[tex]\frac{dy}{dt} = 0 - vsin\theta[/tex]
from first equation we can say
[tex]\int dx = \int u dt - \int vcos\theta dt[/tex]
[tex]0 = uT - v\int cos\theta dt[/tex]
[tex]\int cos\theta dt = \frac{uT}{v}[/tex]
now in the direction of approach of each other
[tex]\frac{dr}{dt} = ucos\theta - v[/tex]
[tex]\int dr = \int ucos\theta dt - \int vdt[/tex]
[tex]0 - d = u\int cos\theta dt - vT[/tex]
[tex]- d = u(\frac{uT}{v}) - vT[/tex]
[tex]T = \frac{vd}{v^2 - u^2}[/tex]
Collaborative learning focuses on the learning of an individual. True or False
Answer:
False
Explanation:
The collaborative learning is not a type of learning that focuses on individual learning. This type of learning focuses on joint learning between two or more individuals that act as a team. The collaborative learning is a method that encourages the two or more individuals to work together, to capitalize on each other's skills and resources for the benefit of the whole, for the team. This type of learning has its own supporters and critics, as some consider it as excellent way to develop the team work and closer bonds between the people, while others argue that it is destroying the potential of the individual.
Collaborative learning does not focus on the learning of an individual, it emphasizes working together in groups to achieve a common goal.
Explanation:The statement 'Collaborative learning focuses on the learning of an individual' is False. Collaborative learning involves students working together in groups or teams to achieve a common goal or complete a task. It emphasizes cooperative and active participation, where students learn from each other's perspectives, experiences, and knowledge. It encourages communication, critical thinking, problem-solving, and teamwork skills. Examples of collaborative learning activities include group discussions, projects, presentations, and peer teaching.
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Which of the following elements has properties different than the rest? a. Ac b. Co c. Cu d. Sc
I can only help if You have a Image of it
Answer:
Your answer would be Ac
Explanation:
hEY YOU! STOP SCROLLING!!! HELP ME?? BRAINLIEST ANSWER + FIVE STAR RATING!! Temperature differences across latitude cause A. )volcanoes B.)earthquakes
C.) the equinoxes
D.) the Coriolis effect
E.) wind
the Answer is D......
according to ohms law if you don't change the value of the resistor and you double the voltage in a circuit the amount of current flowing will _______.
A. Be multiplied by the amount of resistance
B. Remain the same also
C. Divide it in half
D. Double
Answer: D (doubled)
According to ohm's law
I = V/R ,
V = IR ; R = constant and V is doubled
From the equation
V is directly proportional to the current, and it is given that R is constant ;
2V = 2I. R since R = constant
Hence I is doubled.
Do you think you would like to do arson or explosion investigation or evidence testing? Why or why not?
I might want to do fire related crime examination as it would be so magnificent to dissect or research on the off chance that it was illegal conflagration or an inadvertent. It is cool to examine a blast and see where it originated from and who may have done it.
Discovering where everything started and having it lead me to every one of these focuses would energize.
Arson or explosion investigation and evidence testing are careers that suit those with interests in criminal justice, chemistry, and forensic science. Arson and explosion investigators determine the causes of fires and explosions, which can be highly stressful due to the potential legal consequences. Evidence testing is more laboratory-based, using science to provide evidence in court cases, which can be appealing for those who enjoy the sciences.
Explanation:Whether one would enjoy a career in arson or explosion investigation, or in evidence testing entirely depends on an individual's interests and skills. People who are drawn to these fields often have an interest in criminal justice, chemistry, and forensic science. These careers require analytical thinking, an eye for details, and the ability to problem-solve under pressure.
Arson and explosion investigators work on determining the causes of fires and explosions. This can be appealing to those who enjoy solving complex problems and have an interest in safety and prevention measures. However, it can also be a highly stressful profession, as the results of your investigation can have significant legal and personal consequences for those involved.
Evidence testing, on the other hand, is more focused on laboratory work. This work involves testing materials found at crime scenes to provide scientific evidence that can be used in a court case. This can be rewarding to those who enjoy chemistry, biology, or physics. It can also be a challenging career, as the accuracy of your results is paramount and can greatly impact the outcomes of criminal cases.
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According to Newton's first law of motion, what is required to make an object slow down? Enter your answer in the space provided.
Answer:
According to newton's first law of motion, friction is required to make an object slow down.
Explanation:
According to the Newton's first law of motion, for an object to change its velocity (either a change in the magnitude or the direction), there must be a cause to it which is defined as a net external force.
For example, an object which is sliding across a table or floor slows down due to the net force of friction that is acting on that object.
How does a compass needle respond when a compass is placed within a magnetic field? It aligns in a direction parallel to the field. It points toward the edge of the field. It rotates in the center of the field. It aligns in a direction perpendicular to the field.
When a compass is placed within a magnetic field, it aligns in a direction parallel to the field.
At the point when a compass is put inside an attractive field, it adjusts toward a path parallel to the field.
Hope this helps ^_^
What 3 colors make up the colored shadows of the hands
black white green and gold
what is the momentum of a 2.0kg ball rolling at 6.0 m/s
Explain how heat transfer is occurring through convection, radiation AND conduction in this picture.
A cup of tea/coffee transfers heat via conduction, convection and radiation.
Conduction:
Heat transfer from a coffee to the spoon is in direct contactInner part of the tea cup against hot liquid will transfer heat to the outer part and saucer.Convection:
Movement of molecules within the coffee. Hot molecules of the tea at the middle of the drink will be eventually make their way to the outer part of the drink near the tea cup, where they will loose their heat.
Radiation:
Thermal radiation is the loss of heat from a solid object in to atmosphere via the release of electromagnetic radiation. So hot outer edge of the teacup loss the energy to its surroundings via thermal radiation.
When 200.0mL of water is heated from 15.0 deg Celsius to 40.0 deg Celsius, how much thermal energy is absorbed by the water?
Heat required to raise the temperature of water is given as
[tex]Q = ms\Delta T[/tex]
here we know that
[tex]m = mass = 200 mL = 0.200 kg[/tex]
initial temperature = 15 degree C
final temperature = 40 degree C
specific heat capacity = 4186 J/kg C
now by the above formula we will have
[tex]Q = 0.200 (4186) (40 - 15) = 20930 J[/tex]
How much work must be done on a 20-kg go-cart to increase its speed from 5 m/s to 10 m/s?
a. 750 J
b. 250 J
c. 100 J
d. 1000 J
To increase the speed of the go-cart, 250 J of work and energy must be done on it.
Explanation:To find the work done on the go-cart, we can use the work-energy theorem. The work done is equal to the change in kinetic energy of the go-cart.
The initial kinetic energy of the go-cart is given by K_i = (1/2)mv^2, where m is the mass of the go-cart and v is its initial velocity. Plugging in the values, we have K_i = (1/2)(20 kg)(5 m/s)^2 = 250 J.
The final kinetic energy of the go-cart is given by K_f = (1/2)mv^2, where m is the mass of the go-cart and v is its final velocity. Plugging in the values, we have K_f = (1/2)(20 kg)(10 m/s)^2 = 500 J.
The change in kinetic energy is ΔK = K_f - K_i = 500 J - 250 J = 250 J.
Therefore, 250 J of work must be done on the go-cart to increase its speed from 5 m/s to 10 m/s.
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In the United States, most of our electricity comes from this non-renewable resource, which has a negative effect on the environment. (2 points)
coal
nuclear
natural gas
petroleum
The answer is A. Coal
My previous comment was deleted for including a link, sorry :0
In the United States, most of our electricity comes from this non-renewable resource is "coal".
What is coal ?The sedimentary rock known as coal becomes combustible and has been formed in rock strata known as coal seams.
What is non-renewable resource?Natural resources that cannot be easily replenished by biological methods at a rate quick enough even to keep up with use are considered non-renewable resources.
Therefore, in the United States, most of our electricity comes from this non-renewable resource is "coal".
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Which layer would a person drilling a well most likely reach after drilling through the unsaturated zone?
a spring
an aquifer
the water table
an impermeable layer
Answer:
Water Table
Explanation:
first there is the soil moisture then there is the unsaturated zone then there is the water table so the answer is water table
Answer:
Water Table
Explanation:
Which of the following scientists physics in Egypt
1. Dr. Moussa
Amazing Egyptian woman called "Mother of atomic energy"She tried to convince the world to come together and use the nuclear energy for something besides blowing each other up.2. Dr. Ali Moustafa Mousharaffa
Theoretical physicistDean of the faculty of the science cairo, contributed to quantum theory and the theory of relativity.3. Sir Magdi Habeeb Yacoub
Performed more transplants than anybody else in the world.Hearts, lungs whatever. If yous is busted and you can find a spare4. Azza Faiad
She discovered a more efficient way of converting plastic garbage into highly valued biofuel.Alexandrian teenager tackled worlds biggest issueIdentify the meaning of the variables in the point slope form of a line
Answer:m=the slope of the line
(x1, y1)= a given point on the line (x,y)=any point on the line
Explanation:
m = slope of line
x1 , y1 = it is the given point on the line
x ,y = any point on line
What is equation of a line ?The general form of equation of line is y - y1 = m (x-x1) where m is slope of line , y1 and x1 is any point on the line
It is an equation of degree one
x and y represent the coordinate of the point on the line represented in the coordinate plane
m = slope of the line
general equation of a line is y = mx + c
where
m = slope of line
x1 , y1 = it is the given point on the line as data points are represented as (x1,y1) , (x2,y2) , (x3,y3) and so on
x ,y = it is any point line where x is any point on the x axis and y is any point on y axis
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The box in the above picture is falling from the top of a building to the ground. Two major forces are acting on the box as it falls. Which force is represented by the arrow labeled Q?
Answer: Q= Air resistance
Description:
The box release two forces acts on it, when it is falling from the building.
1. Its weight, 2. Air resistance
As this point its weight is much greater due to the force of gravity on the objects, so it accelerates downwards. As its speed increases so does the drag on the object so its acceleration starts slow down until it reaches to zero. At which point air resistance will be equal to weight of the object leaving a resultant force of zero.The answer is Air resistance
Which type of ladder has flat steps, hinged back, self-supporting, and non-adjustable?
Answer: Step Ladders
In general ladders are with inclined or vertical set of steps or rungs between two upright lengths of metal or wood. Ladders used for climbing up and down.
Step ladders :
It is a self supporting portable ladder, most commonly used in industries. Self-supporting means it does not need any support to lean. So this ladder can be used any where in the rooms. For example middle of the room where support is not available. Also this ladder is non-adjustable flat steps and hinged back.
Canada is the country (dash)of the united States
I believe it is north.
Three forces are applied to an object, as shown in the diagram below. F1 = 30 N, F2 = 34 N, F3 = 20 N, d1 = 25 mm, d2 = 20 mm, d3 = 10 mm, θ3 = 500. What is the resultant torque around the point 'x', in units of Nm?
You need to lift up a 45-N object. Explain the strength and direction of the force used to lift the object.
More than 45 N upward!
A 45-N force must be applied upward to lift an object of equivalent weight, counteracting downward force of gravity. These two forces perfectly balance each other according to Newton's third law.
Explanation:To lift the 45-N object, the force you apply should be equal in magnitude, but opposite in direction to the force exerted by the object's weight. This implies that the force to lift the object also should be 45-N, but directed upwards. This is in accordance with Newton's third law which states that for every action there is an equal and opposite reaction.
The direction of the force is significant as it determines the object's movement. The force applied to lift the object should be going against the force of gravity, thus, it should be directed upward. Consequently, this opposes the object's weight which is always directed downward due to the pull of gravity.
The strength and direction of a force are vectors in physics, meaning they have both magnitude and direction. In this case, the magnitude is 45-N and the direction is upward to effectively lift the object against the force of gravity (weight).
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A car traveling at 26 m/s starts to decelerate steadily. It comes to a complete stop in 12 seconds. What is its acceleration?
Genetic information responsible for physical characteristics such as eye color, height, hair color, and skin color can be found in an organism's.........
Answer: Genetic information responsible for physical characteristics such as eye color, height, hair color, and skin color can be found in an organism's DNA.
Explanation:
Our genetic information is stored in DNA. DNA (Deoxyribonucleic acid) molecule is a double helix structure which carries information which used in development and growth of body and determines physical characteristics such as eye color, height, hair color and skin color.
The genetic information determining physical traits like eye color and height is found in an organism's DNA, specifically in structures called genes. These genes are inherited from both parents and their expression as observable traits is known as the phenotype. The genotype and environment interact to influence the resulting characteristics of the individual.
Explanation:The genetic information responsible for physical characteristics, such as eye color, height, hair color, and skin color, can be found in an organism's deoxyribonucleic acid (DNA). The DNA is organized into structures called chromosomes, and specific segments within this DNA known as genes are responsible for various traits. Each gene may exist in different versions referred to as alleles, which determine the variety in these characteristics seen among individuals. In a process called inheritance, genes containing specific alleles are passed from parents to offspring through the reproductive cells, the egg and the sperm.
When the egg and sperm unite, they form a zygote with a complete set of chromosomes, ensuring that the offspring receive genetic material from both parents. This combination of alleles from both parents creates the individual's unique genotype, which is their genetic makeup, and the observable expression of these genes in the individual's traits or characteristics is known as their phenotype.
The interaction between an organism's genotype and the environment in which it develops will influence the presentation of its phenotype. Therefore, characteristics such as height and skin color are affected both by genetic information and environmental factors.
what combination of variables will make an experiment the most reliable
Experiment reliability can be maximized through employing control and experimental groups, careful manipulation and measurement of independent and dependent variables, and using random selection and assignment.
Explanation:The combination of variables that will make an experiment the most reliable includes the implementation of control groups and experimental groups, the careful manipulation and measurement of independent and dependent variables, and the usage of random selection and assignment of subjects to prevent bias.
Control groups, that receive a placebo, allow for comparison and control for potential confounding factors that might impact the results. The independent variable, which is manipulated by the researcher, should ideally be the only significant difference between the experimental and control groups. The dependent variable is then measured to assess the effect of the independent variable.
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The reliability of an experiment can be enhanced by controlling the independent variable, establishing a control group, using a double-blind study design, and random assignment of subjects. Consistent experimental procedures and control of lurking variables also contribute to the reliability.
Explanation:The reliability of an experiment can be enhanced by a careful combination of variables, specifically pertaining to the design and execution of the experiment. One key aspect is the control of the independent variable, which is the variable that is manipulated or changed in the experiment.
Moreover, the establishment of a control group is paramount for comparison. The control group acts as a benchmark and remains unexposed to the experimental manipulation, further controlling for any chance factors that might influence the results of the study.
The experiment's reliability can also be significantly improved by incorporating a double-blind study design. This methodology involves keeping both researchers and participants unaware of the group assignments, reducing the chance of expectancy or bias affecting the results. Random assignment of subjects to treatment groups also helps to limit the influence of lurking variables. These are variables which are not considered in the study but that may affect the results and hence, the validity of the findings.
The careful control of these variables, along with consistent experiment procedures, can increase the reliability of an experiment.
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Choose all of the true statements regarding the relationship between voltage, resistance, and current. Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law. Current is the flow of electrons through a circuit. Ohm's Law is mathematically represented by the equation V=I/R When solving for Resistance in a current and both voltage and current are known values, the equation to solve reads I =V*R If the voltage in a circuit is increased, the current will also increase.
Answer:
1). Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.
2). Current is the flow of electrons through a circuit.
Explanation:
1). Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.
As per Ohm's law we know that
[tex]V = I R[/tex]
here we have
V = voltage difference across the resistor
R = resistance of the conductor
2). Current is the flow of electrons through a circuit.
Rate of flow of charge is known as electric current
It is given as
[tex]I = \frac{dq}{dt}[/tex]
[tex]I = e\frac{dN}{dt}[/tex]
Current is the flow of electrons through a circuit. Ohm's Law is mathematically represented by the equation V=I/R When solving for Resistance in a current and both voltage and current are known values, the equation to solve reads I =V*R If the voltage in a circuit is increased, the current will also increase. Correct options are 2 and 3.
1. **Current is measured in amps and is represented by the symbol "Δ". The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.**
- Current is indeed measured in amperes (amps) and is represented by the symbol "I," not "Δ." The statement correctly mentions Ohm's Law, which relates current (I), voltage (V), and resistance (R). However, the symbol "Δ" is not used to represent current.
2. **Current is the flow of electrons through a circuit.**
- This statement is true. Current is the flow of electric charge, typically carried by electrons, through a circuit. Electrons move from the negative terminal to the positive terminal of a voltage source.
3. **Ohm's Law is mathematically represented by the equation V=I/R. When solving for Resistance in a circuit and both voltage and current are known values, the equation to solve reads I = V * R. If the voltage in a circuit is increased, the current will also increase.**
- Ohm's Law is correctly represented by the equation V=I/R. When solving for resistance (R), the equation is R=V/I. However, the last part of the statement is not necessarily true. According to Ohm's Law, if voltage (V) increases, and resistance (R) remains constant, then the current (I) will also increase. But if resistance increases along with voltage, the current may not necessarily increase.
So, the true statements are:
- Statement 2: Current is the flow of electrons through a circuit.
- Statement 3: Ohm's Law is mathematically represented by the equation V=I/R. When solving for resistance in a circuit, and both voltage and current are known values, the equation to solve reads R=V/I. If the voltage in a circuit is increased, and resistance remains constant, the current will also increase.
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Complete question is:
Choose all of the true statements regarding the relationship between voltage, resistance, and current.
1. Current is measured in amps and is represented by the symbol "Δ" The relationship between current, voltage, and resistance is mathematically defined by Ohm's Law.
2. Current is the flow of electrons through a circuit.
3. Ohm's Law is mathematically represented by the equation V=I/R When solving for Resistance in a current and both voltage and current are known values, the equation to solve reads I =V*R If the voltage in a circuit is increased, the current will also increase.