Answer:
possible answer from edge
Explanation:
After World War II the only coal available to burn residentially, either for cooking or warmth, was of poor quality and contained large amounts of contaminants that made its fumes toxic. So when millions of homes in London burned this low quality coal and the local atmosphere over and around London stagnated, there was nowhere for the fumes to go. This stagnation allowed the toxic coal fumes to build up until they became physically harmful to humans and animals.
Burning of low quality coal was ultimately responsible for London’s “killer fog” in 1952.
What is Coal?This is a type of sedimentary rock which is combustible and contain high amounts of carbon and hydrocarbon.
The low quality coal contained a lot of contaminants which was released into the atmosphere thereby creating the “killer fog” which adversely affected residents.
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The independent variable in Experiment III was the A ) treatments used to prevent corrosion . B ) changes made to the shape of the nails. C) time the treated nails were left undisturbed . D) amount of corrosion , rated on a scale of 0 to 5.
Answer: the answer is A
Explanation: The independent or manipulated variable in Experiment III was the treatments used to prevent corrosion. The dependent or responding variable was the amount of corrosion, rated on a scale of 0 to 5.
___- is defined in science as the abilty to move matter or change matter in some other way
Answer:
Energy
Explanation:
Answer:
energy
Explanation:
Questlon 7 of 10
Which state can always conduct electricity?
OA. Solid
OB. Liquid
OC. Gas
OD. PIlasma
SUBMIT
Answer:
0B. Liqiud can always conduct electricity
As volume increases, pressure_______________________?
Easy points
Answer:
•Each time they collide with the walls they exert a force on them. More collisions mean more force, so the pressure will increase. When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume.
Boyle’s law
Decreasing the volume of a gas increases the pressure of the gas. An example of this is when a gas is trapped in a cylinder by a piston. If the piston is pushed in, the gas particles will have less room to move as the volume the gas occupies has been decreased.
A piston closes the end of a cylinder with some gas molecules inside. The pressure applied to the piston is doubled and the volume inside the cylinder halfs.
As the pressure applied to a piston is doubled, the volume inside a cylinder is halved
Because the volume has decreased, the particles will collide more frequently with the walls of the container. Each time they collide with the walls they exert a force on them. More collisions mean more force, so the pressure will increase.
When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume.
This is shown by the following equation - which is often called Boyle’s law. It is named after 17th century scientist Robert Boyle.
P1V1 = P2V2
where:
P1 is the initial pressure
V1 is the initial volume
P2 is the final pressure
V2 is the final volume
It can also be written as:
pressure1 × volume1 = pressure2 × volume2
Note that volume is measured in metres cubed (m3) and temperature in kelvin (K).
It means that for a gas at a constant temperature, pressure × volume is also constant. So increasing pressure from pressure1 to pressure2 means that volume1 will change to volume2, providing the temperature remains constant.
how much power is requiered to do 100j of work on time of 0.5 seconds
Answer:
200 w
Explanation:
p= w/t= 100 j/ 0.5 s= 200 w
Answer:
Answer is 200 W
Explanation:
p= w/t= 100 j/ 0.5 s= 200 w
Question 3 of 10
What standard units are used for power? Give the name, not the symbol.
Enter your answer
Answer:
The unit of power is pascal.
1. Deshaun Watson (100 kg) accelerates from rest to 9.0 m/s in 1.5 s. What is the average power
output of Deshaun in kW? (2 mark)
Answer:
P = 5400[W]
Explanation:
We must use the following equation of kinematics to calculate the acceleration.
[tex]v_{f}=v_{o}+a*t[/tex]
where:
Vf = final velocity = 9 [m/s]
Vo = initial velocity = 0 (starting from rest)
a = acceleration [m/s²]
t = time = 1.5 [s]
[tex]9=0+a*1.5\\a=9/1.5\\a=6[m/s^{2} ][/tex]
Now with this second equation of kinematics, we can determine the distance traveled.
[tex]v_{f}^{2}=v_{o}^{2}+2*a*x[/tex]
where:
x= distance [m]
[tex]9^{2} = 0 +2*6*x\\12*x=81\\x=6.75[m][/tex]
Now we must use Newton's second law which tells us that the sum of forces is equal to the product of mass by acceleration.
∑F = m*a
Now replacing:
[tex]F=100*6\\F=600[N][/tex]
Ahora la potencia se puede calcular por medio del producto de la fuerza por velocidad.
[tex]P=F*v[/tex]
where:
P = power [W]
F = force = 600 [N]
v = velocity = 9 [m/s]
[tex]P=9*600\\P=5400[W][/tex]
Question 2 of 10
What is the product of the mass and velocity of an object?
O A. Impulse
O B. Force
O C. Energy
O D. Momentum
Answer: The answer is D
Explanation:
When is the net force on the car closest to 0?
Answer: The net force is the vector sum of all the forces acting on an object. When an object is in equilibrium (either at rest or moving with constant velocity), the net force acting on it zero. A vector can only have zero magnitude if all of its components are zero. there is more than one force acting on an object, then F is the net force. If two people pull on an object with equal forces in opposite directions, then the net force is zero and the acceleration is zero
Explanation:
An engineer is investigating potential energy with two
identical magnetic roller coaster cars on different sides of a
center magnet that cannot move. To test her ideas, the
engineer will move one car one space. Which movement will
result in the largest increase in potential energy?
A.
Moving Car 1 one space toward the center magnet.
B.
Moving Car 2 one space toward the center magnet.
C.
Moving Car 2 one space away from the center magnet.
D.
All these movements will result in the same change in potential energy
because they each move a roller coaster car the same distance.
Answer:
Since they move in the same direction, share the same magnetic qualities, and move one unit identically We can safely say its DA grain of sand runs into the Earth at 5,000 m/s. How does the acceleration of the Earth during the collision compare to the
acceleration of the grain of sand during the collision?
a. The same
b. It's greater
c.It's less
Answer:
The same
Explanation:
Why would it probably be very difficult to determine the chemical and physical properties of a newly discovered synthetic element?
a.
The element would not fit in the periodic table.
b.
The element’s nuclei would break apart very quickly.
c.
The element would combine the properties of the nuclei from which it was made.
d.
The element would lack many properties of ordinary elements.
the answer is c
Explanation:
ANSWER ASAP GIVING BRAINLIEST FIVE STARS AND A HEART!
As sound waves move throughout a medium the particles from it vibrate in different directions.
Answer:
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.
what ideas do you have a bout why different places have lower or higher rates of skin cancer?
Answer: Some places like Florida and California are both very hot and dry places, the sun damages your skin more in sunny places then in colder more breezy places.
Explanation:
What is this called?
Explanation:
its spring
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DEFINE the term free fall
If a net 300 N force is applied to a 100 kg mass, what will be the acceleration of the mass?
Answer:
3 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{300}{100} = 3 \\ [/tex]
We have the final answer as
3 m/s²Hope this helps you
A current of 310 amps is flowing through a copper wire with a resistance of 30 ohms. What is the voltage?
Answer:
The voltage is 930v
Explanation:
The voltage drop of the copper wire is 9300 volt.
What is electric current?Electric current is the transfer of charge through any cross-sectional area of a conductor in one unit of time. SI unit of electric current is ampere and it is measured via ammeter.
Given parameters:
Current passing though the copper wire: I = 310 amp
Resistance of the copper wire: R = 310 ohms.
We have to find; the voltage drop on wire; V = ?
We know that;
V = IR
⇒ v = 310 × 30 Volt = 9300 Volt.
Hence, the voltage drop of the copper wire is 9300 volt.
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You toss a ball straight upward, in a positive direction. The ball falls freely under the influence of gravity. At the highest point in the ball's motion.
A.) its velocity is zero and its acceleration is positive (upward).
B.) its velocity is zero and its acceleration is negative (downward).
C.) its velocity is positive (upward) and its acceleration is zero.
D.) its velocity is zero and its acceleration is zero.
Answer:
B.) its velocity is zero and its acceleration is negative (downward).
Explanation:
When the ball is thrown upwards in the air, the ball starts with its velocity being high and positive upwards against the force of gravity. Due to force of gravity pulling the object to the center of the earth, its velocity decreases as it reaches the maximum height where the velocity is instantaneously zero. At this maximum height its acceleration is -9.81 m/s².
At the highest point in the ball's motion, its velocity is zero and its acceleration is negative (downward).
All objects within the earth's gravitational field are affected by the force of gravity. Gravity is the reason why objects fall to the ground when they are thrown upwards.
If you toss a ball upward, the ball will fall freely under the influence of gravity. At the highest point in the ball's motion, its velocity is zero and its acceleration is negative (downward).
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When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelength of UV light?
Please use 3 x 108 m/s for the speed of light (c).
Answer:
Explanation:
Formula and givens
λ = c / fλ is the wavelengthc = the speed of lightf = the frequencyc = 3*10^8f = 7.89 * 10^14λ = ?
Solution
λ = 3*10^8 / 7.89*10^14
λ = 3*10^8/7.89*10^14
λ = 2.36 * 10^7
λ = 236 nanometers. What you use as your solution depends on what what you have been taught.
What is the mass of solid dissolved per unit volume of liquid called?
Answer:
I belive the awnser to this question is density.
Water has a density of 1000 kg/m3. A piece of rubber has a density
of 1024 kg/m3. Explain what would happen if the rubber was put in
a pool of water?
Explanation:
if the rubber was put in a pool of water then the rubber sinks in water because the density of rubber (1024 kg/m³) Is more than that of water (100 kg/m³) . As we know if the density is greater than water then the substance sinks in water.
Hope it will help :)
What is energy? Where does it come from? What does it do? Explain in 5 or more sentences please! :)
Answer:
Energy is defined as the ability to do work. Forms of energy could be kinetic energy or potential energy. Thermal or heat energy can originate from a hot object such as the sun. Energy is used to produce work. Electrical energy for lighting purposes and heating in homes and factories.
Explanation:
Energy is defined as the ability to do work and can be in various forms such as kinetic energy, potential energy, thermal, chemical, electrical energy etc.
Energy origination depends on the type of energy form in discussion. Thermal or heat energy can originate from a hot object such as the sun or an iron box, chemical energy originates from the interaction of atoms and molecules and electrical energy can be initiated by movements of electrons.
Energy is used to produce work. Different forms of energy can do different tasks such as;
Heat energy for heating water
Electrical energy for lighting purposes
Geothermal energy for producing heat and electricity
Nuclear energy for production of nuclear power
Chemical energy for facilitating chemical reactions
Billiard ball A (0.35 kg) is struck such that it moves at 10 m/s toward a second identical ball (Ball B) initially at rest. After the collision, Ball A continues to move in the same direction at 2 m/s. What is the magnitude of the velocity for Ball B after the collision?
Answer:
Explanation:
We shall apply law of conservation of momentum during the collision of ball A and B .
Total momentum before collision of A and B = .35 x 10 = 3.5 kg m/s
Let the velocity of B after collision be v .
Total momentum after collision = .35 x 2 + .35v
According to law of conservation of momentum
.35 x 2 + .35v = 3.5
.35 v = 2.8
v = 8 m /s .
The direction of B will be same as direction of A .
HELP me now what is the meaning of the word scalars and vectors
Answer:
Scalars are quantities that are fully described by a magnitude (or numerical value) alone. Vectors are quantities that are fully described by both a magnitude and a direction.
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Which has a greater momentum, a 350kg car traveling at 20 m/s or a 400kg truck traveling at 17.5 m/s?
Answer: the formula for momentum is velocity times mass
car :
350 x 20 = 7000
truck:
400 x 17.5 = 3000
Ans : Car has a greater momentum
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A 1400 kg car has an engine that exerts 9800 N of force. If the force of friction between the car and the road is roughly 2801 N, what is the car's acceleration?
Friction opposes the force provided by the car's engine, so by Newton's second law the acceleration a is such that
∑ F = 9800 N - 2801 N = (1400 kg) a
a = (6999 N) / (1400 kg) ≈ 5.0 m/s²
The force experienced by an electron in a field between parallel plates is proportional to which of the following?
Select all that apply.
1. the distance between the plates
2. the inverse of the distance between the plates
3. the current in the circuit
4. the inverse of the potential between the plates
5. the potential difference between the plates
Answer:
2 and 5
Explanation:
A cannonball is fired to the west at an angle of 60 degrees above the horizontal, with a velocity of 20 meters per second. What is the x-component of this velocity
Answer: 10 m/s W
Explanation:
v = 20 m/s
θ = 60°
the x component will be the cos of this angle
Vx = cosθ20
Vx = cos(60°)20
Vx = 0.5(20)
Vx = 10 m/s W
The x-component of this velocity will be = 10 m/s west
What are x and y components of a vector ?The x-component of a vector is the product of the magnitude with the cosine of the angle made by the vector with horizontal and the y-component is the product of its magnitude with the sine of the angle made by the vector with horizontal .
given
angle with horizontal (theta ) = 60 degrees
velocity = 20 m/s
x component = ?
V x ( velocity in x direction ) = V cos (theta)
= 20 cos 60°
= 10 m/s west
The x-component of this velocity will be = 10 m/s west
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Important!
New drivers who are 18 don't have to complete all the steps of the graduated licensing system.
A. True
B. False
Answer:
b
Explanation:
