The principle of conservation of momentum states that if two objects collide, then the total momentum before and after the collision will be the same if there is no external force acting on the colliding objects.
What is the conservation of linear momentum?The conservation of linear momentum is a general law of physics which states that the overall momentum of a system is constant and that the quantity called momentum which characterises motion never changes in an isolated collection of objects.
For a system to have its momentum conserved, it must satisfy two conditions: During the interaction, the system's mass must not change. The objects may transmit mass to one another as they interact (apply forces to one another), but any mass one object gets is offset by the loss of that mass from another.
On the reasonable assumption that space is uniform—that is, that there is nothing in the rules of physics that prevents the conservation of linear momentum—the law of conservation of linear momentum is amply supported by experiment and can even be analytically inferred.
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A rotating platform with a radius of 2.0 m makes one complete turn every 3.0 s. The angular velocity of the platform is most nearly A 2.1 rad/s B 1.5 rad/s C 1.0 rad/s D 0.70 rad/s E 0.30 rad/s
The angular velocity of a rotating object is 2.1 rad/s. So option A is correct.
It is defined as the rate of change of its angular position, and it is measured in units of radians per second (rad/s).
The angular velocity of a rotating platform can be calculated using the formula: angular velocity = 2 * pi * (frequency of rotation)
Frequency of rotation = 1 / time for one complete rotation = 1 / 3 sec = 0.33 Hz
Therefore, the angular velocity of the platform is 2 * pi * 0.33 Hz = 2.09 rad/s
The answer is closest to A 2.1 rad/s
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a collision at 30 mph will take any loose object in your car and give it the same force as if it were:
A collision at 30 mph will take any loose object in your car and give it the same force as if it were: shot from a canon.
What is the force of impact at 30 mph?Your body weight times the speed of the moving object equals the crash force. If you are holding your child while driving, you run the risk of crushing them if there is an accident. A 100-pound adult becomes a 3,000-pound force on the youngster in an accident at 30 miles per hour.About 40% of those struck by a car traveling at 30 mph will die as a result of their injuries, according to the U.S. Department of Transportation (DOT). To give you an idea, consider that 5 percent of people would not survive being hit by a car doing 20 mph.
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A spring scale is used to exert a net force of 5.6 N on a cart, If the cart's mass is 340 grams, what is the cart's acceleration ?
Force = 5.6N
Mass = 340g = 0.34kg
Acceleration= Force/mass
= 5.6/0.34 = 16.4m/s²
for best results, if not tested immediately, a semen sample should remain at which of the following temperatures following collection?
For best results, if not tested immediately, a semen sample should remain at a temperature 37 ºC. Thus, option C is correct.
What is temperature?Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold. Temperature is measured with a thermometer, which may be calibrated to a variety of temperature scales, including Celsius, Fahrenheit, Kelvin, and Rankine. The most commonly used scales are Celsius (formerly called centigrade) and Fahrenheit.
In scientific terms, temperature is the measure of the average kinetic energy of particles in a system. Temperature is an intensive property, meaning it is independent of the amount of matter in a system. For example, water at a given temperature is the same regardless of whether it is in a glass, a bucket, or an ocean.
This temperature range is the optimal temperature for preserving the viability of the sperm cells. If the sample is not tested immediately, it should be stored in a refrigerator or cooler with a temperature at or below this range to ensure the best possible results.
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Complete question:
For BEST results, if not tested immediately, a semen sample should remain at which of the following temperatures following collection?
a) 4 ºC
b) Room temperature
c) 37 ºC
d) -40 ºC
The value of q1 and q2 will be 3.0 x 10^-9 C respectively. Because to be at equilibrium, both of the charges must have equal but opposite charge in them is -6 x 10^-9 C. So we will divide this value into equal and opposite types
Answer:
Yes, you are correct. In order to be in equilibrium, two charges must have equal but opposite charges. So, if the total charge is -6 x 10^-9 C, dividing it into equal and opposite charges would give each charge a value of 3 x 10^-9 C. This is because (-6 x 10^-9 C) / 2 = 3 x 10^-9 C.
Suppose you wanted to reach Alpha Centauri (4.4 ly from the Solar system) in 70 years. How fast would you have to go, in km/hr? Express your answer using two significant figures. How many times faster is the speed you found in part A than the speeds of our fastest current spacecraft (around 50000 km/hr)? Express your answer using two significant figures.
Alpha Centauri (4.4 ly from the Solar system) in 70 years. The speed should be around 6.8×107 kph.
What is meant by speed ?
Speed is what it means. the speed at which an object's location changes in any direction.The distance traveled in relation to the time it took to travel that distance is how speed is defined.Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path.In other words, velocity is a vector, whereas speed is a scalar value.The pace at which a distance changes over time is referred to as speed. It has a dimension of time-distance.As a result, the fundamental unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the metre per second (m/s) is the SI unit of speed.To learn more about speed refer to
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which of the following best accounts for the pressure in teh vessel remaining constant as the volume decreaseds betlow 0.21l
The best option that accounts for the pressure remaining constant in the vessel as the volume decreases below 0.21L is the ideal gas law PV = nRT
Support your answer with an explanation.According to the ideal gas law, the ratio of a gas's pressure (P) and volume (V) to its moles (n) multiplied by its gas constant (R) multiplied by its temperature (T) is known as the ideal gas equation. The pressure and volume are inversely related when the number of moles and the temperature are held constant, which means that as the volume falls, the pressure increases and vice versa.
However, in this case, as the volume falls below 0.21L, the pressure inside the vessel stays constant. This could be explained by the use of outside forces, such a membrane or a piston, which can keep the gas under pressure even as it decreases.
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If we drop 2 objects of different weights from the same height, which one will reach the ground faster?
If we drop 2 objects of different weights from the same height, both of them will reach the ground at the same time.
Gravity, at the surface of a body like Earth, provides an acceleration to bodies and this acceleration is constant and its value is equal to 9.8m/s². This is because the Earth attracts big objects more than little ones, but the big ones have more inertia, which cancels out. So, all the bodies on the earth's surface fall at the same acceleration of 9.8m/s²
This acceleration due to gravity,g is independent of the mass of the body. The time of flight for any freely falling object depends on the value of acceleration due to gravity and its initial speed. So both the bodies reach the ground at the same time.
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A rock is dropped off a cliff and strikes the ground with an impact velocity of 30 m/s. How high was the cliff? A. 20 m B. 30 m C. 45 m D. 60 m
The height of Cliff is 45 m
It is given that
Velocity with which rock dropped from cliff =
30 m/s
intial velocity = 0 m/s
acceleration due to gravity = 10 m/s^2
We have to find how high was the cliff
v^2 - u^2 = 2as
(30)^2 - 0 = 2 x (-10) x s
900 = -20s
s = 45 m
Hence, height of Cliff is 45 m
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The chart shows the movement of a ball after several seconds. A 2-column table with 4 rows. The first column labeled A has entries 0, 4, 8, 12, 16. The second column labeled B has entries 0, 2.5, 6, 8, 10. Column A is on the x-axis, and Column B is on the y-axis. Which titles should replace A and B? Column A should be “Time,” and Column B should be “Position.” Column A should be “Position,” and Column B should be “Time.” Column A should be “Velocity,” and Column B should be “Speed.” Column A should be “Speed,” and Column B should be “Velocity.
The titles should replace A and B are Column A should be “Time,” and Column B should be “Position.”
What is the position of the ball after 4 seconds? How long does it take for the ball to reach a position of 8?At 4 seconds, the position of the ball is at (4,2.5). This is indicated on the chart by the intersection of the two lines on the 4th point of the x-axis (column A) and the 2.5th point of the y-axis (column B).It takes 4 seconds for the ball to reach a position of 8. This is evident from the chart as the 8th point of the x-axis (column A) intersects with the 10th point of the y-axis (column B). This intersection indicates the position of the ball at 8 seconds. Thus, it can be concluded that it took 4 seconds for the ball to reach a position of 8. This is in line with the increasing increments of 4 on the x-axis and 2.5 on the y-axis, as presented in the chart.To learn more about movement of ball refer to:
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The pendulum in a grandfather clock has a period of 1.00 sec? If the clock's driving spring is allowed to run down, damping due to the friction will cause the pendulum to slow to an eventual stop. If the time constant for decay is 300 sec, how long will it take for the pendulum's swing to be reduced to half its initial amplitude?
It will take 207.9 sec for the pendulum's swing to be reduced to half its initial amplitude.
given:
T= time period initial = 1 sec
time constant = 300 sec
The pendulum's oscillation will eventually be stopped due to the air resistance offered by air . Oscillations will die down in a manner such that it makes an exponential curve.
We want the time at which the pendulum will stop due to friction
We know the formula for damping
[tex]A = A[/tex]' [tex]e^{-(\frac{t}{300} )}[/tex]
A= initial amplitude
A' = final amplitude = A/2
so 't' at
[tex]A = \frac{A}{2} \ 300[/tex] ㏑ (2 )
t= 207.94 sec
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Describe how solar radiation that arrives at the equator is redistributed around the earth through atmospheric circulation.
-unequal heating forms Hadley cells that redistribute heat
-unequal heating forms convection currents that redistribute heat
-unequal heating forms wind currents that redistribute heat
-unequal heating alters ocean currents that redistribute heat
Uneven heating patterns Uneven heating causes Hadley cells, which disperse heat; convection currents, which redistribute heat; wind currents, which redistribute heat; and ocean currents, which redistribute.
What type of heating for just a house is the least expensive?If you have access to natural gas as a heating source where you live, it will probably end up being the least expensive way of heat a house. Despite price increases, natural gas remains the most affordable space heating option. Electricity, gas, and heating oil are next, going from the next least expensive from the most expensive.
Which heating system is the most effective?The most effective type of house heating is a heat pump. Their biggest flaw is that they don't work well at extremely high or low temperatures. You can require space heaters all over your house during extremely cold weather, which reduces efficiency.
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Select the statement(s) that accurately illustrate examples of energy transfer by radiation.
Heat emitted from a candle
Ocean waves on the surface of the sea Microwaves from a microwave oven
Radio waves transmitted between towers Sound waves from a car radio
Heat emitted from a candle, Microwaves from a microwave oven, Radio waves transmitted between towers, Sound waves from a car radio.
Illustrate examples of energy transfer by radiation?The examples of energy transfer by radiation mentioned above are heat, microwaves, radio waves, and sound waves. Heat is the transfer of thermal energy from one object to another, usually through the process of convection, conduction, or radiation. Heat emitted from a candle is an example of energy transfer by radiation.Microwaves are electromagnetic waves that are used to heat food in a microwave oven. The microwaves are generated by an oscillating electric current and then radiated into the oven, where they are absorbed by the food. This energy is then converted into heat, which cooks the food. Radio waves are used to transmit information between towers, such as those used for cellular phone communication. The towers emit radio waves, which travel through the air, and the information they contain is then picked up by the towers on the other end. Sound waves are also a form of energy transfer by radiation. When a car radio is playing, sound waves are emitted from the radio, which then travel through the air to your ears. The process of energy transfer by radiation is called electromagnetic radiation. This is the process by which energy is transferred from one place to another in the form of electromagnetic waves. Examples of electromagnetic radiation include visible light, infrared radiation, ultraviolet radiation, x-rays, and gamma rays.To learn more about the examples of energy transfer by radiation refer to:
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If you push a particle of mass M inthe direction in which it is already moving, you expect theparticle's speed to increase. If you push with a constant forceF, then the particle will accelerate with accelerationa=F/M (from Newton's 2nd law).
A. Enter a one- or two-word answer that correctly completes thefollowing statement.
If the force is applied for a fixed interval of time t, then the _____ of the particle will increase by an amountat.
B. Enter a one- or two-word answer that correctly completes thefollowing statement.
If the force is applied over a given distance D, along the path of the particle, thenthe _____ of the particle will increase byFD.
C. If the initial kinetic energy of the particle isK1, and its final kinetic energy isKf, express Kfin terms of K1 and thework W done on theparticle.
D. Now, consider whether the following statements are true orfalse:
The dot product assures that the integrand is alwaysnonnegative.
The dot product indicates that only the component of theforce perpendicular to the path contributes to theintegral.
The dot product indicates that only the component of theforce parallel to the path contributes to the integral.
E. Assume that the particle has initial speedv1. Find its final kinetic energy Kf in terms ofv1, M, F, andD.
F. What is the final speed of the particle?
A. Speed ; B. kinetic energy ; C. Kf = K1 + W ; D. The statements are false. E. Kf = K1 + (FD) ; F. v = sqrt(2Kf/M).
What is kinetic energy?In physics, kinetic energy of an object is the energy that it possesses due to motion.
A. If the force is applied for a fixed interval of time t, then speed of the particle will increase by an amount at.
B. If the force is applied over given distance D, along the path of particle, then kinetic energy of the particle will increase by FD.
C. Kf in terms of K1 and work W done on particle is : Kf = K1 + W
D. The statements are false. The dot product does not guarantee that the integrand is always nonnegative and also it does not indicate that only the component of force perpendicular or parallel to the path contributes to integral.
E. Final kinetic energy Kf in terms of v1, M, F, and D is Kf = K1 + (FD)
F. Final speed can be determined using the formula, Kf = 1/2 * M * v^2. where v is final speed. It can be rearranged to find v = sqrt(2Kf/M).
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What is the kinetic energy of a 1,678-kilogram boat moving at 4.6 m
Answer:
17,753.24 J (Joules)
Explanation:
To calculate the kinetic energy of an object, we use the formula:
Kinetic energy = 1/2 * mass * velocity^2
where mass is measured in kilograms and velocity is measured in meters per second.
Given that the boat has a mass of 1,678 kilograms and a velocity of 4.6 meters per second, we can substitute these values into the formula to find its kinetic energy:
Kinetic energy = 1/2 * 1,678 * (4.6)^2
Kinetic energy = 1/2 * 1,678 * 21.16
Kinetic energy = 17,753.24 J (Joules)
So the kinetic energy of the 1,678-kilogram boat moving at 4.6 m/s is 17,753.24 J (Joules).
8. The Earth orbits the Sun at a distance of 1.46x1011 m from center to center. What is the strength of the Sun’s gravitational field at this distance?
The strength of the Sun's gravitational field at this distance is [tex]0.622m/s^2[/tex]
What is Gravitational field?A gravitational field is defined as the model used to explain the effects that a massive body exerts in the space around it exerts a force on another massive body. Therefore, a gravitational field is used to explain gravitational phenomena, and it is measured in newtons per kilogram.
The acceleration due to gravity on the surface of the earth is given by;
[tex]g = GM/R^2[/tex]
Where, g is the acceleration due to gravity
G is Gravitational constant [tex](6.673 * 10^-^1^1 Nm^2 kg^-^2)[/tex]
M is the mass of the planet [tex](1.99* 10^3^0 kg)[/tex]
R is the radius of planet
So, for above given information, [tex]g= \frac{6.022 * 10^-^1^1* 1.99* 10^-^3^0}{(1.46* 10^1^1)^2}[/tex]= [tex]0.622m/s^2[/tex]
Thus, the strength of the Sun's gravitational field at this distance is [tex]0.622m/s^2[/tex].
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the two block in (figure 1) are at rest on frictionless surfaces. what must be the mass of the right block in order that the two blocks remain stationary? suppose that m
The right block must have a mass of 7.9 kg to balance the forces and remain stationary.
The two blocks remain stationary when the net force on the system is zero. In this case, the force of gravity on the two blocks is balanced by the tension in the rope connecting them. The tension in the rope can be determined using the sine of the angles and the masses of the blocks.
Tension = (mass1 × gravity) × sin(angle1) + (mass2 × gravity) × sin(angle2)
Substituting the known values:
Tension = (10 kg × 9.8 m/s²) × sin(23°) + (mass2 × 9.8 m/s²) × sin(40°)
Solving for mass2:
mass2 = (Tension - (10 kg × 9.8 m/s²) × sin(23°)) / (9.8 m/s² × sin(40°)).
The mass of the right block must be 7.9 kg for the two blocks to remain stationary.
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The question is -
Two blocks in the Figure below are at rest on frictionless surfaces What must be the mass of the right block so that the two blocks remain stationary? 4.9kg 6.1kg 7.9kg 9.8kg
Changes in the quantity and quality of light have important implications for life in aquatic environments, both by influencing the quantity and distribution of productivity and by influencing the vertical profile of temperature with water depth.
Changes in the quantity and quality of light can have significant impacts on aquatic environments, both on the organisms that live there and on the physical characteristics of the water. Some key impacts include:
What are the changes in quantity and quality of light that can have significant impact?
Productivity: Light is a key factor in photosynthesis, the process by which plants and algae produce food. Changes in the quantity or quality of light can affect the amount of productivity in an aquatic environment, leading to changes in the distribution and abundance of different species.Temperature: Light can also affect the temperature of water, particularly in deeper parts of the water column. In the absence of light, water at the bottom of a lake or ocean will be cooler than water at the surface. Changes in the quantity or quality of light can alter this temperature profile, with implications for the organisms that live there.Distribution of species: Light is a major factor influencing the distribution of aquatic organisms. For example, many species of fish and other aquatic animals live in areas of the water column that receive a lot of light, while other species prefer areas with less light. Changes in the quantity or quality of light can shift the distribution of these species, leading to changes in the overall community structure.Photosynthetic organisms: Changes in light intensity and quality can affect the survival, growth and reproduction of photosynthetic organisms like phytoplankton and seaweed.Light pollution: Artificial light sources can disrupt the natural light cycle of aquatic organisms, affecting their behavior, reproduction and survival.Overall, changes in the quantity and quality of light can have significant and wide-ranging impacts on aquatic environments, affecting everything from the productivity and temperature of the water to the distribution and survival of different species.
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if a wave is traveling at a velocity of 120 m/s and has a frequency of 5 hz, which of the following can be determined? A.The mass of the wave. B. The speed of the wave. C.The wavelength of the wave. D. The direction of the wave.
If a wave has a frequency of 5 Hz and is moving at a speed of 120 m/s, its wavelength is 24 m.
Given,
Velocity =120m/s
Frequency=5Hz
So the Wavelength of the wave is,
[tex]\lambda =\frac{v}{f}[/tex]
[tex]\lambda =\frac{120}{5}=24m[/tex]
[tex]\lambda =24m[/tex]
So the Wavelength of the wave is 24m
The number of waves that pass through a fixed point in a given amount of time is defined as the frequency. If a wave takes 1/2 second to pass, the frequency is 2 per second. If it takes one-hundredth of an hour, the frequency is one hundred per hour.
After passing through a series of events or positions and returning to its original state, a body in periodic motion is said to have gone through one cycle or one vibration. Additionally, see angular velocity and simple harmonic motion.
The frequency is 2 per second if the period or time interval, required to complete one cycle or vibration is 1/2 second; 100 per hour if the period is 1/100 of an hour.
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for the following unbalanced reaction, suppose exactly 6.95 g of each reactant is taken. determine which reactant is limiting, and also determine what mass of the excess reagent will remain after the limiting reactant is consumed.
Suppose exactly 6.95 g of each reactant is taken and the following details are given by A and B then 6.95 g of A is equivalent to 6.95/molar mass of A moles of A. 6.95 g of B is equivalent to 6.95/molar mass of B moles of B.
How much extra reagent will still be present once the limiting reactant has been used up?To determine which reactant is limiting, we need to compare the amount of each reactant to the stoichiometry of the reaction.
The stoichiometry of the reaction is 1:2 for reactants A and B, respectively.
Therefore, if we have 6.95 g of A and 6.95 g of B, we can calculate the ratio of A to B to determine which reactant is limiting.
6.95 g of A is equivalent to 6.95/molar mass of A moles of A.
6.95 g of B is equivalent to 6.95/molar mass of B moles of B.
Comparing the moles of A and moles of B, we can see that A is limiting, as there is less A than required by the stoichiometry of the reaction.
To determine the mass of the excess reagent (B) that will remain after the limiting reactant (A) is consumed, we need to calculate the moles of B that are in excess.
We can calculate the moles of B that are used up by the reaction (based on the stoichiometry of the reaction) and subtract this from the total moles of B that were initially present.
The remaining moles of B can then be converted back into grams to find the mass of B that will remain.
Using the above method, the mass of the B remaining after A is consumed can be calculated.
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s the open sharing of ideas in an atmosphere of respect (in order to achieve understanding between the speaker and listener(s). group of answer choices selective perception scriptwriting dialogic communication defensive listening
Dialogic communication is the open sharing of ideas in an atmosphere of respect (in order to achieve understanding between the speaker and listener(s).
What is Dialogic communication?Dialogic communication is a method of communication that promotes dialogue between a speaker and their audience. In presenting their ideas to an audience, dialogic communication encourages speakers to be assertive (calm, respectful, and open). The dialogic theory is founded on three guiding principles: Monologue is less natural than dialogue. Meaning is found in people, not words. Perceived meanings are influenced by contexts and social situations (Bakhtin, 2001a; Bakhtin, 2001b). Mutuality, propinquity, empathy, risk, and commitment are the five principles underlying dialogic theory (Kent & Taylor, 2002). Mutuality is defined by an orientation toward inclusion or collaboration, as well as a spirit of mutual equality. Mutuality has two characteristics: collaboration and a spirit of mutual equality.
Here,
Dialogic communication is the open exchange of ideas in a respectful environment (to achieve understanding between the speaker and listener) (s).
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5. Brownian motion of smoke particles a) State and explain the observation. b) State and explain what will be observed if the temperature surrounding the smoke cell is increased: What is the function of Microscope,Lens and Smoke
(A) When an air particle bombards a smoke particles, the smoke particle moves to the same direction as the air particle that hit it. When another air particle hits the smoke particle, it changes its direction to that of the second air particle, and so on. This is called Brownian motion.
(B) If the temperature of the surroundings is increased the air particles would gain kinetic energy resulting in more frequent collisions with the smoke particles. Therefore, the smoke particles would be seen moving haphazardly.
(C) The microscope helps magnify the smoke particles for a much more better observation. The lens help in focusing. As the air particles are really small and cannot be observed; therefore, smoke particles are used as they are easy to see and observe; thus, ensuring a better experiment.
you have two long wires separated by a distance x and oriented perpendicualr. in terms of x where would the charge have to be placed to remain stationary
When two long wires are separated by a distance x and oriented perpendicular to each other, a charge placed at certain points will remain stationary due to the balance of electric forces acting on it.
What location would the charge need to be in order to stay stationary?Here are some potential locations for the charge to remain stationary in terms of x:At the midpoint between the two wires: The charge will be equidistant from both wires, so the electric force on it from one wire will be equal and opposite to that of the other wire, resulting in a net force of zero.At a point along the line that bisects the angle between the two wires: This point is known as the "equipotential point" and is located at a distance of x/√2 from each wire. The electric forces from each wire will be equal in magnitude but opposite in direction, resulting in a net force of zero.At a point along the line that connects the two wires: This point is known as the "neutral point" and is located at a distance of x/2 from each wire. The electric forces from each wire will be equal in magnitude but opposite in direction, resulting in a net force of zero.It is important to note that the charge must be placed at these specific points in order to remain stationary, as any deviation from these points will result in the charge moving due to an unbalanced net force.
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given that average speed is distance traveled divided by time, determine the values of \(m\) and \(n\) when the time it takes a beam of light to get from the sun to the earth (in \(\rm s\)) is written in scientific notation. note: the speed of light is approximately 3.0\(\times\)108 \(\rm m/s\). enter \(m\) and \(n\), separated by commas.
According to the solving the value of average speed m =5 and value of n =2.
What does a speed's average mean?The average speed is the total distance it travels in a predetermined amount of time. The typical speed is represented by a scalar value. It is characterised by the magnitude and lacks direction.
According to the given information:150 million kilometers separate the planet from the sun.
We are aware that a million
= 10^6 and 1 km= 10^3 m
Hence,
150 million km = 150× 10^6 ×10^3 metre=150×10^9 m
=1.5×10^11 m
The speed of light in a vacuum is 2.999... m/s, which is roughly equivalent to 3.0 108 m/s.
Calculating the time it takes for the light beam to travel from the sun to Earth is demanded of us.
we know that average velocity v = distance/time
Time ⇒ distance/velocity
Here distance=1.5×10^11 m and v=c= 3.0×10^8 m/s
hence time
=0.5×10^3 s
=5.0×10^2 s
m10n [where m is the magnitude and n is the power of 10] is the proper way to write a scientific notation.
Hence the value of m =5 and value of n =2
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determine the force in members be, ef, and cb, and state if the members are in tension or compression.
In this case, member be is in compression because force Fbe = -Fec - Fed is negative. Member ef is in tension because force Fef = -Fed - Fae is positive. Member cb is in compression because force Fcb = -Fae - Fec is negative.
What is equilibrium?Equilibrium is the condition of a system when neither its state of motion nor its internal energy state tends to change with the time.
For member be:
Fbe = Fce + Fde
Fbe = -Fec - Fed
And For member ef:
Fef = Fde + Fae
Fef = -Fed - Fae
For member cb:
Fcb = Fae + Fce
Fcb = -Fae - Fec
If the force is positive it is in tension, if it is negative it is in compression.
And, in this case, member be is in compression because force Fbe = -Fec - Fed is negative. Member ef is in tension because force Fef = -Fed - Fae is positive. Member cb is in compression because force Fcb = -Fae - Fec is negative.
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Which of the following is not a reason why short-circuit calculations are necessary for electrical systems?
a.They are needed to analyze OCPDs for selective coordination.
b.They are needed to determine the standard ampere rating of the OCPD.
c.They are needed to ensure that OCPDs and components/equipment of a distribution system have adequate interrupting ratings and short-circuit current ratings.
d.Service equipment is required to be marked with the available fault current.
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Your answer is correct.
The correct answer is: They are needed to determine the standard ampere rating of the OCPD.
The correct answer is b. They are required to establish the OCPD's typical ampere rating.
What are the benefits of performing short-circuit calculations in an electrical system?
Performing short circuit calculations in an electrical system can provide a number of benefits.
Short circuit calculations can help prevent potential safety hazards and maximize the efficiency of the electrical system.
By performing these calculations, the system can be designed to ensure that any overcurrent are limited to safe levels and that the equipment is not overloaded.
Additionally, the calculations can be used to determine the fault level of the system, allowing for the selection of components and the assignment of protective devices that can effectively manage any overcurrent that occur.
By having an understanding of the fault level, the system can be designed to prevent any outages that could occur due to overloading or short circuiting of the system.
Short circuit calculations also provide a way to verify the functionality and performance of the system, as well as identify any areas that require improvement.
Overall, short circuit calculations are an invaluable tool for designing and maintaining a safe and reliable electrical system.
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A skater is standing still on a frictionless ice rink. Her friend throws a Frisbee straight to her. In which of the following cases is the largest momentum transferred to the skater?
(a) The skater catches the Frisbee and holds onto it.
(b) The skater catches the Frisbee momentarily, but then drops it vertically downward.
(c) The skater catches the Frisbee, holds it momentarily, and throws it back to her friend.
The largest momentum transferred to the skater is the skater catches the Frisbee, holds it momentarily, and throws it back to her friend.
The skater stands on a frictionless surface and his friend Frisbee starts moving behind him. The lack of friction makes the skater unstoppable.
However, when the skater returns to his friend through the Frisbee again, there is a backward force that increases the skater's speed. So and momentum is directly proportional to velocity, so as velocity increases so does momentum.
In Newtonian mechanics, momentum (more precisely, linear or translational momentum) is the product of an object's mass and velocity. A vector quantity that has magnitude and direction. If m is the object's mass and v is its velocity (which is also a vector quantity), then the object's momentum p is p = mv.
Advanced formulations of classical, Lagrangian and Hamiltonian mechanics allow the choice of coordinate systems containing symmetries and constraints. In these systems the conserved quantity is the generalized momentum, which is generally different from the momentum defined above. The generalized concept of momentum carries over into quantum mechanics and becomes the operator of the wavefunction. The momentum and position operators are related by the Heisenberg uncertainty principle.
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if the people are all lined up on the street at different blocks, and the police siren starts at block 3, which statement describes what block each person is standing at? wycleff is on block 1, lilly is on block 4, quincy is on block 12, and emilia is on block 17. lilly is on block 1, wycleff is on block 4, quincy is on block 12, and emilia is on block 17. lilly is on block 1, wycleff is on block 4, emilia is on block 12, and quincy is on block 17. wycleff is on block 1, lilly is on block 4, emilia is on block 12, and quincy is on block 17.
Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17 is the correct statement about each person standing at block.
Simple definition of the Doppler effect.As a source and observer move closer or farther apart, the Doppler effect, which is a phenomenon in physics, causes the frequency of sound, light, or other waves to rise or fall. When a source emits waves, those waves are compressed as they approach the observer.
Wycleff could hear a low-pitched sound the entire time, indicating that the police car was relocating away from him. He was thus in block 1.
A Doppler effect (change in pitch) was the first thing Lilly noticed. She was at block 4, so the car must have passed her first.
After Lilly, Emilia noticed a Doppler effect. She was at block 12 when the car passed Lilly before passing her.
The entire time, Quincy heard a high-pitched sound, which indicated that the police car was approaching. He was thus in block 17.
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Water is pumped from ground level to a reservoir of a roof of a building 15m high.The reservoir holds 12cm2 of water and it takes 40minutes to fill it by the pump, calculate the power of the pump assuming it's efficiency is 65%.
(Density of water=1000kg/M3 and g=10ms-2)
Answer:
The power of the pump can be calculated using the following equation: Power = (Volume of water * Density of water * gravity * height) / (Time * Efficiency)
Therefore, the power of the pump is (12 * 1000 * 10 * 15) / (40 * 0.65) = 18,750 Watts.
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maria makes a graphic organizer to compare open, closed, and short circuits. she adds the labels shown. label 1: current flows in the circuit. label 2: this forms when a bulb burns out.
Maria compares three types of electrical circuits and their properties, behavior, and results using a graphical organizer. Label 1 represents an open circuit, label 2 a closed circuit, and label 3 a short circuit.
Label 1 refers to an open circuit where no current flows through the circuit because the flow of current has been interrupted or interrupted. This can happen if a switch is turned off, a fuse is blown, or a connection is loose.
Label 2 refers to a closed circuit in which current can flow through the circuit because there is a complete path for the current to flow. This is the normal operating state of the circuit.
Label 3 refers to short circuits that occur when there is an unintentional connection between the positive and negative sides of the circuit.
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