Answer:
[tex]1.917*10^8\ N[/tex]
Explanation:
Coulomb's law states that the electric force between two charges is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them. It is given by the formula:
[tex]F=k\frac{q_1q_2}{r^2}\\ \\q_1=first\ charge = 1.2C,q_2=second\ charge=0.36C,k=coulomb\ constant=8.988*10^9 N.m^2/C^2, r=distance=4.5m,F=force\\\\F=8.988*10^9*\frac{1.2*0.36}{4.5^2} =1.917*10^8\ N[/tex]
1. Describe the two phenomena (sub-problems) that caused the contamination of Cleveland’s drinking water. 2. What criteria (data points) were the NOAA buoys collecting to address the sub-problems faced by Cleveland Water? Which of these criteria should have highest priority when determining a solution to the sub-problems? 3. What societal, ecological, or technical constraints should resource managers consider before proposing solutions? 4. Describe the design solution engineers and scientists developed to prevent contamination of Cleveland drinking water. Why did their solution need to address both sub-problems equally? 5. Propose two additional solutions to address the ecological phenomena causing the water contamination in Lake Erie.
Answer:
Explanation:
1) One was the harmful algae blooms that happen annually. The other is hypoxia development which is also a seasonal phenomenon. 2) Temperature should have been highest priority.
help awnsers need expertsss
Answer:
ok the answer for number 14 is 0.5 0 kilograms to get this answer this is my explanation ok where try that the bottle of water when full has a mass of 1.30 kg and one half of the water is poured away the mass of the bottle and the half of water is 0.90 kilograms so to get the the water that was poured out we will subtract 0.90 kg from 1.30 kilograms to get 0.40 kilograms so this 0.40 kilograms is the half of the water that was poured out meaning the other half is also 0.40 so to get the mass of the bottle we will take mass of the bottle plus the water - mass of the water so it will be 1.30 kilograms - 0.80 kilograms to get 0.50 kilograms.and number 15 I don't know I'm sorry about thatFor the first 10 seconds a squirrel runs 3 m/s to look for an acorn. The next 5 seconds he eats an acorn that he finds. Afterwards the squirrel runs 2 m/s back to where he started. (A) How long does it take for the squirrel to get back to where he started?
Distance covered by the squirrel to look for an acorn :
d = ( 3 m/s ) × 10 s = 30 m.
Time taken to eat an Acron is 5 seconds.
Time taken to cover distance of 30 m with 2 m/s speed is :
[tex]T=\dfrac{30}{2}\ s= 15 \ s[/tex]
Therefore, total time take to get back to where he started is ( 10+5+15 ) = 30 s.
Hence, this is the required solution.
Answer:
it wont let me commment so i need to know if the answer above is correct
Explanation:
A runner starts at rest and accelerates until reaching a speed of 9.0 m/s. A graph of her velocity over time is shown below
Velocity
m
15+
12+
9
6
3+
Time (s)
1
3
6
9
12 15 18
What is her average acceleration from 0 to 9.0 seconds?
Answer:
0.67 m/s^2
Explanation:
khan academy
A stone dropped from the top of a building strikes the ground in 4.2 s. How tall is the building? Someone explain please!
Answer:
well i'm not sure if which unit of measure you need but i think its 86.49 meters tall.
please elp! will mark BRAINLIEST
Answer:
Help with what
Explanation:
A scientist who conducted an experiment obtained an unexpected result. What will she most likely do with the unexpected result? leave it out of her analysis and final report stop the experiment and begin again change the procedures and try again develop a new question to be investigated
Answer: stop the experinment and begin again sometimes the result of the experiment may give you unexpected results due to the fact that you may have missed a certain step or you didn't follow the procedure accurately to the dot, hence it's important to redo the experiment and see if every step was followed accurately before you can discard the results or change the procedure.
Explanation:
Answer:
d
Explanation:
what is the central mass of a apple ?
Why would the CPSC perform studies when other soap and detergent companies have already conducted research on the same products? The CPSC is the only organization that can test the safety of soaps and detergents. Studies conducted by any company that benefits financially are considered unreliable. Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company. Tests performed by the CPSC follow established scientific methods, but those performed by soap companies do not.
Answer: Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.
Explanation:
The function of Consumer Product Safety Commission is to make sure that the products which are used by consumers are safe and also make sure that companies meet the required and acceptable safety standards. The products that are seen to be harmful to the health of the consumers are banned.
Regarding the question above, CPSC would perform studies when other soap and detergent companies have already conducted research on the same products because the studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.
Answer:
Tests performed by the CPSC follow established scientific methods, but those performed by soap companies do not.
Explanation:
Which characteristic is related to kinetic energy but not potential energy?
A. An object's shape
B. An object's mass
C. An object's speed
D. An object's height
Answer:
c
Explanation:
An object's speed is the characteristic which is related to kinetic energy but not the potential energy. Thus, the correct option is C.
What is Kinetic energy?The kinetic energy of an object is the energy which it possesses due to the motion of the object. Kinetic energy is defined as the work which is needed to accelerate an object of a given mass from rest position to its stated velocity. Having gained this amount of energy during the acceleration of the object, the object maintains this kinetic energy unless its speed changes or it experiences acceleration.
Kinetic energy is directly proportional to the mass of the object and to the square of the velocity of the object, the expression is:
K.E. = 1/2 m × v²
where, KE = Kinetic energy,
m = mass of the object,
v = velocity of the object.
Therefore, the correct option is C.
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A driver of a car traveling at -15m/s applies the brakes, causing a uniform acceleration of +2.0m/s2. If the brakes are applied for 2.5s, what is the velocity of the car at the end of the braking period? How far has the car moved during the braking period?
Given :
Initial velocity, u = -15 m/s.
Acceleration , a = 2 m/s².
Time taken to applied brake, t = 2.5 s.
To Find :
The velocity of the car at the end of the braking period.
How far has the car moved during the braking period.
Solution :
By equation :
[tex]v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s[/tex]
Now, distance covered by car is :
[tex]s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m[/tex]
Hence, this is the required solution.
You and your friends are going on a picnic in a very small car. On your way, the car breaks down and you try to push it to get it to move but in vain. You ask your friends to help you and the car starts moving and revs up. How are you and your friends applying Newton's second law of motion here? What if the car you were traveling in was a large SUV?
Answer:
The pushing of the car by you and your friends is the applied force and when the car moves, it means that the velocity has changed thus causing the movement or acceleration.
Explanation:
Newton's work on forces regarding motion can never be neglected by scientists. Sir Isaac Newton when he was alive, among several of his works he proposed the three laws guiding the forces of motion. In this question we are only going to be treating only one out of the three Newton's Law of motion and that is the second Law Of Newton's laws of motion.
The second Law Of Newton's laws of motion states that the acceleration of an object is directly proportional to the applied force and inversely proportional to the object's mass.
(1). Now, to the question: " How are you and your friends applying Newton's second law of motion here? "
The pushing of the car by you and your friends is the applied force and when the car moves, it means that the velocity has changed thus causing the movement or acceleration.
According to the law, the more the Force, the more the acceleration.
(2). For the second part of the question, " What if the car you were traveling in was a large SUV?"
From the law stated above we see that the acceleration is inversely proportional to the mass, thus if the car is a large SUV, It means that more force is needed to change the car's velocity.
Answer:
When a friend joins you in pushing the small car, the net force on it increases. Therefore, it starts to move. The mass of a SUV is much greater than that of a small car. You would thus need the help of more friends to help push it.
Explanation:
Plato/Edmentum
what pair of features best characterizes a sound wave?
Answer:
The only thing you need to know which pair of features that best characterizes a sound wave is to view the graph or the image of monitor.
Explanation:
IDK MORE POINTS BUT SAY SOMTHING FUNNY
Not the place for this but yesterday I ate a clock, it was very time consuming.
What is brown and sticky
A STICK GET YOUR MIND OUT OF THE GUTTER
Which model of the atom has electrons traveling in specific paths around the nucleus? Bohr's model Rutherford's model Thomson's model Dalton's model
Answer:
A, Bohr's model
Explanation:
Took the quiz, hope it's right for you.
(The other three did have something to do with it they just didn't create that specific model)
The model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.
Therefore, the correct answer is option B
J. J Thomson proposed that the atom is a sphere of positively charged matter in which negatively charged electron are embedded.
In Rutherford's model of atomic structure, the electrons moves in orbits by electrostatic attraction to the positively charged nucleus.
According to Dalton's atomic theory, atom were indestructible and indivisible solid particle.
Bohr's model made assumption that electron can only exist in circular orbits of definite quantum energy.
According to the question, the model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.
Therefore, the correct answer is option B
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Questlon 6 of 10 Which two types of energy does an apple falling to the ground have?
A. Potential energy
B. Nuclear energy
C. Kinetic energy
D. Elastic energy
E. Sound energy
A. Potential energy C. Kinetic energy
I just took the quiz
Answer:
Potential energy + Kinetic energy
Explanation:
ap3x verified
True or False. Energy can move in waves.
True, energy can in move in waves because waves transfers energy during their propagations.
A wave is a disturbance that transfers energy from one point to another, along its path of propagation.
A wave can be mechanical or electromagnetic.
A mechanical type of wave requires material medium for its propagation.
Examples;
sound wavewater waveAn electromagnetic wave does not require material medium for its propagation.
Examples;
Gamma rayx-rayultraviolet rayvisible light, etcThus, we can conclude that energy can in move in waves because waves transfers energy during their propagations.
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3. What are the two parts of a shadow?
O opaque area and dark area
the umbra and penumbra
O the umbra and
antunghaya
O the illuminated opaque object and the umbra
Answer:
the umbra and penumbra
Explanation:
The two parts of a shadow are the umbra and penumbra.
A shadow is an expression formed when light from a source is cut blocked by an opaque body.
Most shadows are made up of two parts, umbra and penumbra.
The umbra is the darkest, and the innermost part of a shadow. In the penumbra, only a portion of the light source is blocked. It is more of like a partial shadow.The umbra is directly formed by light which impinges on an opaque body and it completely cut off.
What does it mean to
"accelerate"?
Answer:
increase in amount or extent.
Explanation:
in other words speed up or go faster in a less time period
Determine the weight of a 2959.0-kg car that is moving at a speed of 21 m/s. Enter a
numerical answer.
weight=mass*gravity
w=2959.0*10
w=29590N
The weight of a 2959.0-kg car that is moving at a speed of 21 m / s would be 28998.2 Newtons, here speed of the car is the redundant value that is not used to calculate the weight of the car.
What is gravity?It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another.
As given in the problem, we have to determine the weight of a 2959.0-kg car that is moving at a speed of 21 m / s .
The weight of the car = mass of the car × acceleration due to gravity
= 2959 × 9.8
= 28998.2 Newtons
Thus, the weight of a 2959.0-kg car that is moving at a speed of 21 m / s would be 28998.2 Newtons.
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i’m about to end my life over this class I have a 46.9% right now :) do not take physics. i repeat if you’re seeing this DO NOT EVER TAKE PHYSICS.
Coulomb's law describes how the charge on and distance between two
particles affect the electric force between them. Which situation will result in
the two particles being attracted to each other?
The situation in which one particle has a positive charge and one has a negative charge will result in the two particles being attracted to each other.
What is Coulomb's law?It states that the force between two charged particles is directly proportional to the product of the magnitude of the charges and inversely proportional to the square of the distance between them.
Given is Coulomb's law which describes how the charge on and distance between two particles affect the electric force between them.
From the properties of charges, we know that the like charges repel and unlike charges attract each other. This means that two positive charges will repel each other and two negative charges will also repel each other. However, if one positive and one negative charge are brought closer to one another, than they will attract each other.
Therefore, the situation in which one particle has a positive charge and one has a negative charge will result in the two particles being attracted to each other.
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The radius of Mars is 3.4 x 10^6m and the period of Mars's rotation is 24 hours. What is the radial accelerations (in m/s^2) of an object on the ground at its equator?
A. 0.018m/s^2
B. 0.136m/s^2
C. 0.068m/s^2
D. 0.376m/s^2
Answer:
Option A: 0.018m/s^2
Explanation:
Formula for radial acceleration is;
α_r = ω²r
Now, ω = 2π/T
We're given T = 24 hours. Converting to seconds is; T = 24 × 60 × 60 seconds
ω = 2π/(24 × 60 × 60)
We are given radius = 3.4 × 10^(6) m
Thus;
α_r = (2π/(24 × 60 × 60))² × 3.4 × 10^(6)
α_r = 0.018 m/s²
A 20 N model rocket launched vertically is clocked at 25 m/s when it is 15 m above the ground (and has expended a negligible amount of fuel). Use the work–energy principle to find the rocket’s initial speed.
Answer:30.3 m/s
Explanation:
What are the theoretical properties of a gas at a temperature at 0 kelvin?
Answer:
The theoretical properties of a gas at a temperature of 0 Kelvin would be solid and hard. It will go from gas to liquid and finally to a solid state. All the particles will be mushed together. If a gas at zero degrees Celsius were cooled to -273 degrees Celsius, its volume would be reduced by 273/273 and become zero.
True or False? Physical properties can be observed or measured without changing the identity of matter.
Answer:
true
Explanation:
What is the depth of the crater if the time is 6.3 s? An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. To determine the depth of the crater, she drops a rock and measures the time it takes for it to HIT the bottom
Complete Question
An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. To determine the depth of the crater, she drops a rock and measures the time it takes for it
to hit the bottom. If the time is 6.3 s, what is the depth of the crater?
Answer:
The depth is 32 m
Explanation:
From the question we are told that
The time is t = 6.3 s
The acceleration due to gravity is [tex]g = 1.62 \ m/s^2[/tex]
Generally from kinematic equation
[tex]s = ut + \frac{1}{2} - at^2[/tex]
Here the u is the initial velocity and the value is 0 m/s
[tex]s = 0 + \frac{1}{2} - (1.62) * (6.3)^2[/tex]
[tex]s = 32 \ m [/tex]
Calculate: A baseball accelerates downward at 9.8 m/s2. The force pulling the ball downward is 1.4 N. What is the mass of the baseball?
[tex]\large{\underline{\underline{\red{\tt{\purple{\leadsto } AnsweR:-}}}}}[/tex]
Given : Acceleration of the ball is 9.8 m / s² . The pulling force is 1.4 N .
To Find : The mass of the ball .
Solution : It is given that a ball accelerates download with a acceleration of 9.8 m / s² . And the acting force is 1.4 N .
We know that , Force acting is equal to the product of mass and acceleration . That is ,
[tex]\boxed{\purple{\bf Force=mass\times acceleration}}[/tex]
⇒ Force = mass × accelerⁿ
⇒ 1.4 N = mass × 9.8 m / s²
⇒ mass = 1.4 N / 98 m/s²
⇒ mass = 14N / 98 m/s².
⇒ mass = 1/7 kg .
Hence the mass of the object is 1/7 kg ≈ 0.14 kg.
Three toy boats with the same mass were in a lake. Two boats were moving and one was stopped. Each boat got bumped by another boat, but not in the same direction. All the boats changed speed as a result of being bumped. Use the information in the diagram to answer. Which toy boat exprienced the strongest force when it was bumped ? How do you know ?
The answer is " The orange and gray toy boats experienced the strongest force because both gained the same force as they sped up the blue boat lost force so it slow down
Explanation:
Trust me I did this one for an assignment
The boat that will experience the strongest force is the boat that has the highest speed.
According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.
F = ma
[tex]F = \frac{mv}{t}[/tex]
where;
F is the force experienced by the objectv is the velocity of the objectt is the time of motionThe force experienced by the boats is directly proportional to the velocity of their motion. Since the boats have the same mass, the force experienced by each boat will depend on the speed with which the boat moves.
Thus, the boat that will experience the strongest force is the boat that has the highest speed.
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pls help asap pls explain. Just before opening her parachute a skydiver having a mass of 50 kg reaches terminal velocity. Calculate the force of air resistance if the buoyant force is 20 N. Be careful! Use the skydiver’s mass to calculate his/her Fg (force of gravity).
Answer:
490N
Explanation:
Given that,
Mass of a skydiver, m = 50 kg
Buoyant force = 20 N
When the skydiver reaches the terminal velocity, net force on her is equal to 0. So, air drag is equal to the weight of the skydiver.
D = mg
Putting all the values,
D = 50 × 9.8
D = 490 N
So, the force of air resistance is 490 N.