What are atoms doing that cause fireworks to change colors
Answers
Answer:
Heating atoms causes electrons to move from their ground-energy level to a higher energy level. When the excited electrons move to a lower energy level, they emit light with a specific energy and characteristic color.
Explanation:
Look it up
A distinct chemical reaction leads to the varied colors we perceive. Below you may find a further explanation.
The colors of explosions generated through the usage of metal salts were indeed distinct from table salts as well as chemical 'salt' corresponds toward any metallic or non-metallic compound's atomic complex.Several of these chemicals generate strong burning colors, making them suitable for explosives materials.Learn more about atoms here:
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Related Questions
Two charges repel each other with a force. If the magnitude of both charges double, but the distance between them remains constant, the force between them will
A. Double
B. Triple
C. Quadruple
D. Remain the same
Answers
Answer:
C.
Explanation:
3. A large passenger ship required a force of 1,600,000 N to move 2000 m. How much work is done on the ship?
Answers
Answer:
3,200,000,000 J
Explanation:
Work is defined as the amount of energy transferred as an object is moved a certain distance with a certain force. Mathematically, we express this with the equation
[tex]W=Fs[/tex]
where W is work (measured in joules), F is the force applied (in Newtons), and s is the distance, also called the displacement (in meters).
Here, we have F = 1,600,000 N and s = 2000 m, so our work will be
[tex]W=1.600.000(2.000)=3.200.000.000[/tex] J
How many molecules are in 0.5 mol?
Answers
Answer:
1 mol of any compound (including of course CO2 and O2) contains 6.022*10^23 molecules
Therefore 0.5 mol of CO2 and O2 contains 3.01*10^23 molecules of each.
How is mass related to potential energy?
Answers
Answer:
Potential energy is the stored energy of position possessed by an object. In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
Explanation:
A baseball player throws a baseball with the same initial velocity 5 different times. Each time the ball is thrown at a different angle. The angles are: 45o, 15o, 60o, 25o, and 80o. (a) List the angles based on the amount of time in the air, from the shortest time to the longest time. (b) List the angles based on the horizontal range the baseball travels from the shortest distance to the longest distance.
Answers
Answer:
(a) The list of angles based on amount of time in the air; 15° < 25° < 45° < 60°, < 80°
(b) The list of angles based on distance = 80° < 15° < 25° < 60° < 45°
Explanation:
(a) The given parameters are;
The angles in which the ball is thrown, θ = 45°, 15°, 60°, 25°, and 80°
The velocity with which the ball is thrown each time = The same velocity
The amount of time the projectile is in the air given as follows;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (\theta) }{g}[/tex]
Where;
t = Half the amount of time the projectile is in the air
θ = The angle of flight of the projectile
u = The initial velocity of the projectile = Constant for all angles in which the ball is thrown
g = The acceleration due to gravity = 9.8 m/s² = Constant
Therefore, we have;
When θ = 45°;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (45^ {\circ}) }{g} = \dfrac{2\cdot u \cdot \dfrac{\sqrt{2} }{2} }{g} = \dfrac{\sqrt{2} \cdot u }{g}[/tex]
When θ = 15°;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (15^ {\circ}) }{g} \approx \dfrac{0.517638\cdot u }{g}[/tex]
When θ = 60°;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (60^ {\circ}) }{g} = \dfrac{2\cdot u \cdot \dfrac{\sqrt{3} }{2} }{g} = \dfrac{\sqrt{3} \cdot u }{g}[/tex]
When θ = 25°;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (25^ {\circ}) }{g} = \dfrac{0.8452365\cdot u }{g}[/tex]
When θ = 80°;
[tex]2 \cdot t = \dfrac{2\cdot u \cdot sin (80^ {\circ}) }{g} = \dfrac{1.9696155\cdot u }{g}[/tex]
Therefore, the list of the angles based on the amount of time in the air from the shortest time to the longest time is given as follows;
List of angles based on amount of time in the air; 15° < 25° < 45° < 60°, < 80°
(b) The horizontal range, R is given as follows;
[tex]R = \dfrac{u^2 \cdot sin(2 \cdot \theta) }{g}[/tex]
When θ = 45°
[tex]R = \dfrac{u^2 \cdot sin(2 \times 45 ^{\circ}) }{g} = \dfrac{u^2 \cdot sin(90 ^{\circ}) }{g} = \dfrac{u^2 }{g}[/tex]
When θ = 15°
[tex]R = \dfrac{u^2 \cdot sin(2 \times 15 ^{\circ}) }{g} = \dfrac{u^2 \cdot sin(30 ^{\circ}) }{g} = \dfrac{1}{2} \cdot \dfrac{u^2 }{g} = 0.5 \cdot \dfrac{u^2 }{g}[/tex]
When θ = 60°;
[tex]R = \dfrac{u^2 \cdot sin(2 \times 60 ^{\circ}) }{g} = \dfrac{u^2 \cdot sin(120 ^{\circ}) }{g} = \dfrac{u^2 }{g} \cdot \dfrac{\sqrt{3} }{2} =0.866025 \cdot \dfrac{u^2 }{g}[/tex]
When θ = 25°;
[tex]R = \dfrac{u^2 \cdot sin(2 \times 25 ^{\circ}) }{g} = \dfrac{u^2 \cdot sin(50 ^{\circ}) }{g} = \dfrac{0.7660444 \cdot u^2 }{g}[/tex]
When θ = 80°
[tex]R = \dfrac{u^2 \cdot sin(2 \times 80 ^{\circ}) }{g} = \dfrac{u^2 \cdot sin(160 ^{\circ}) }{g} = \dfrac{0.34202 \cdot u^2 }{g}[/tex]
Therefore the list of angles based on the horizontal range the baseball travels from the shortest distance to the longest distance is given as follows;
List of angles based on distance = 80° < 15° < 25° < 60° < 45°.
calculate electrostatic force. PLEASE HELP ASAP !!!!!! thank you so so so much!!!! will give brainliest!!!!
Answers
Answer:
Force = 2.4 10^(-17) N
Explanation:
Recall that if you have the field, the force is easily obtained by multiplying E times the charge:
F = E * q = 150 * 1.6 10^(-19) N = 240 * 10^(-19) N = 2.4 10^(-17) N
which agrees with answer C in your list of possible answers.
I really need some help with this. The question is in the photo
Answers
D
EXPLANTION:
Every one the these option can make the magnetic field increase.
FUN FACT:
Magnetic resonance imaging machines use magnets, and they generate stronger fields than the Earth
I hoped this helped and have a great day :3
What is accuracy
Classification of error
Answers
Answer:
The description of the frame of reference is characterized below.
Explanation:
Accuracy, as well as regression coefficients, seem to be the new standard measures besides summing up the validity of the developed modeling techniques. Classification accuracy unfortunately due to the presuppositions established by professionals on data sources with such an equitable classification process on supervised learning mostly with completely skewed category apportionmentvolleyball falls on sand at timet 0 ms and quickly comes to rest. ... The Net Force On The Ball Over Time Is Shown Below Force (N) 3 2 T-> Time(ms ) 15 10 15 20 25 ... Note That Time Is In Ms. Kg M ..
Answers
Answer:.05 kg*m over s
Explanation:did the work
Explain how neutrons enable a nuclear chain reaction to take place. (2)
Answers
Answer:
Explanation:
In addition to the 'daughter' products, two or three neutrons also explode out of the fission reaction and these can then collide with other uranium nuclei which are unstable so these cause further fission reactions. This is known as a chain reaction .
Hope this helps
A 2160 kg car moving east at 10.4 m/s collides with a 3250 kg car moving east. The cars stick together and move east as a unit after the collision at a velocity of 5.16 m/s. a) What is the velocity of the 3250 kg car before the collision? Answer in units of m/s. 009 (part 2 of 2) 10.0 points b) What is the decrease in kinetic energy during the collision? Answer in units of J.
Answers
Answer:
Explanation:
10
A man is running up an escalator. He is moving 5 m/s, but the escalator is also moving up at 3.5 m/s. Find the resultant velocity.
Answers
The man's resultant velocity is
8.5 m/s up .
How will the electrostatic force between two electric charges change if one charge is doubled and the second charge is tripled?
a. 1/6 times the original force
b. 6 times the original
c. 18 times the original
d. 1/36 of the original
Answers
Answer:
b. The force is 6 times the original
Explanation:
Coulomb's Law
The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.
Written as a formula:
[tex]\displaystyle F=k\frac{q_1q_2}{d^2}[/tex]
Where:
[tex]k=9\cdot 10^9\ N.m^2/c^2[/tex]
q1, q2 = the objects' charge
d= The distance between the objects
Suppose one of the charges is doubled, i.e., q1=2q1 and the other charge is tripled (q2'=3q2). The new force F' would be:
[tex]\displaystyle F'=k\frac{(2q_1)(3q_2)}{d^2}[/tex]
Operating:
[tex]\displaystyle F'=k\frac{6q_1q_2}{d^2}[/tex]
[tex]\displaystyle F'=6\cdot k\frac{q_1q_2}{d^2}[/tex]
Substituting the original value of the force:
[tex]F'=6\cdot F[/tex]
b. The force is 6 times the original
The electrostatic force between two electric charges will change by 18 times the original force if one charge is doubled and the second charge is tripled. Option c. is correct .
Coulomb's law is a basic principle of electromagnetism that describes how the electric charge exerts force on other charges. The force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. When one charge is doubled and the other is tripled, the force between the two will be 18 times the original force. The electrostatic force between two electric charges is directly proportional to the product of the charges.
Therefore, when one charge is doubled and the second charge is tripled, the electrostatic force will be 18 times the original. Thus, the correct option is c. 18 times the original force.
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what formula can you use to calculate average speed
Answers
Answer:
the DTS triangle
Explanation:
DTS stands for distance, time, and speed, which you can use to calculate any of the three if you have the other two.
Weighing 15,000 N is parked on a 10 m2 hydraulic lift platform. What is the area of a small piston if a 1,100 N nozzle is used to lift the vehicle?
Answers
Answer:
[tex]A_2=0.74\ m^2[/tex]
Explanation:
Given that,
Weight, F₁ = 15,000 N
Area, A₁ = 10 m²
Weight, F₂ = 1100 N
We need to find the area of the small piston. The pressure exerted on both piston will be equal such that,
[tex]\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}\\\\A_2=\dfrac{F_2A_1}{F_1}\\\\A_2=\dfrac{1100\times 10}{15000}\\\\A_2=0.74\ m^2[/tex]
So, the area of the smaller piston is [tex]0.74\ m^2[/tex].
a bottle of soft drink was moved from the refrigerator after sometime it was observed that his temperature has increased by 15 rakine what is the temperature change in Fahrenheit and Celsius
Answers
Answer:
8.333C 15F
Explanation:
15R in C - 0R in C = 8.3333C
15R in F - 0R in F = 15F
3. A 0.145 kg ball moving horizontally at 20 m/s is struck by a bat that causes the ball to move in the
opposite direction at 15 m/s. If the ball and bat were in contact for 5 ms, how much force did the bat
apply to the ball?
Answers
Answer:
F = 1015 N
Explanation:
Given that,
Mass of a ball, m = 0.145 kg
Initial speed, u = 20 m/s
Final speed, v = -15 m/s (as it moves in opposite direction)
The ball and bat were in contact for 5 ms
We need to find the force the bat applies to the bat. We know that,
F = ma
[tex]F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{0.145\times (-15-20)}{5\times 10^{-3}}\\\\F=-1015\ N[/tex]
So, the bat will apply 1015 N force to the ball.
A 20-kilogram object strikes the ground with 1960 J of kinetic energy after falling freely from rest. How far above the ground was the object when it was released? *
Answers
Answer:
h = 10 m
Explanation:
Given that,
Mass of an object, m = 20 kg
It strikes the ground with 1960 J of kinetic energy after falling freely from rest.
We need to find how far above the ground was the object when it was released. Let it is h.
The kinetic energy is converted to potential energy. It can be given by the relation as follows :
[tex]E=mgh\\\\h=\dfrac{E}{mg}\\\\h=\dfrac{1960}{20\times 9.8}\\\\h=10\ m[/tex]
So, it was at a height of 10 m when it was released.
Examine the picture of the screw on page 214. Explain how to calculate the mechanical advantage of the screw.
Answers
Answer:
1.4
Explanation:
Need help asapppp
Thanks + BRAINLIST only if you know correct answer
1.Electromagnetic waves are
a. forms of matter
b. forms of space
C. longitudinal waves
d. transverse waves
2. A filter with vertical slits allows only waves that vibrate from side to side to pass
through
a.True
b. False
3.An electromagnetic wave is made up of vibrating an electric and magnetic fields.
a. True
b. False
Answers
Answer:
1. d. transverse waves
2. False
3. True
1. D
2. B
3. A
A relative asks your advice about a skin cream that reduces oxidation of
the lower skin layers and, thereby, reduces skin aging. Explain to her the
effectiveness of the skin cream based on that claim.
?
Answers
Answer:
Hmm
Explanation:
Answer:
Are antioxidant-rich skincare products as effective as they say they are? Best Health checked the science behind the claims.
Rusting iron and the browning flesh of an avocado both have something in common with the discoloration, wrinkles and fine lines of our aging skin: oxidation. Antioxidants counter this natural aging process, and that’s why they have been taking top billing in skin care.
Explanation:
A tourist leaves Pittsburgh and travels 60 miles South on I-79 in 45 minutes. They exit after Wheeling and head west on I-70 and drive an additional 100 miles in 1 hour and 15 minutes. What is the tourist’s average speed?
Answers
Answer:
The tourist's average speed was 80 mph
Explanation:
Average Speed
If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:
[tex]\displaystyle v=\frac{d}{t}[/tex]
The tourist leaves Pittsburgh and travels 60 miles South in 45 minutes. Then he heads West and travels 100 miles in 1 hour and 15 minutes.
The total distance traveled is:
d = 60 miles + 100 miles = 160 miles
The total time is:
t = 45 minutes + 1 hour + 15 minutes = 2 hours
The average speed is:
[tex]\displaystyle v=\frac{160}{2}[/tex]
v = 80 mph
The tourist's average speed was 80 mph
Can you please help me in this question? Help would be REALLY appreciated :)
An unknown material has a refractive index of 2.78 x106. How fast is light traveling in in this material?
Answers
Answer:
294.68
Explanation:
I hope you right answer
The velocity of light travelling in that medium = v= 107.9 m/s
What is refractive index?
It is a ratio of the velocity of light in vacuum to velocity of light in a specific medium
given
refractive index of material( u) : 2.78 * 10 ^6
c = 3* 10 ^8 m/s
velocity of light travelling in that medium(v) = ?
u = speed of light / v
v = speed of light / u
v= 3* 10 ^8 / 2.78 * 10 ^6
v= 107.9 m/s
velocity of light travelling in that medium = v= 107.9 m/s
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Suppose the Pathfinder moves at a rate of 0.2m/s for 20 seconds and then turns around and travels at the same speed for 3 seconds, what is the Pathfinder's current position?
Answers
Answer:
PLEASE BE MORE SPECIFIC
Explanation:
The pathfinder is currently 3.4 m away from its initial position. Speed can be defined by the change in position of the object over time.
What is Speed?
It can be defined by the change in position of the object over time. The distance can be calculated by the formula,
[tex]d = s \times t[/tex]
Where,
[tex]d[/tex]- distance
[tex]s[/tex] - speed
[tex]t[/tex] - times -
Initially, Pathfinder moves,
[tex]d = 0.2 \times 20 \\\\d = 4 \rm \ m[/tex]
Then he turns back and moves,
[tex]d' = 0.2 \times 3 = 0.6 \rm m[/tex]
So the current position is:
[tex]D = d - d'\\\\D = 4 - 0.6 \\\\D = 3.4\rm m[/tex]
Therefore, the pathfinder is currently 3.4 m away from its initial position.
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a 28 kg ball is rolling across the top of a 0.75 m tall table. the ball has 350 J of kinetic energy. how fast is the ball moving
Answers
350= 1/2(0.75)v^2
350= (0.375)v^2
933 = v^2
30.5 = v
The balls moving at a speed of 30.5 m/s
You have a transformer with 50 turns in the primary coil if you want to increase the voltage from 5V26V how many times should be in the secondary coil
Answers
Correct question:
You have a transformer with 50 turns in the primary coil if you want to increase the voltage from 5V to 6V how many turns should be in the secondary coil ?
Answer:
the number of turns in the secondary coil is 60 turns.
Explanation:
Given;
number of turns in the primary coil, P = 50 turns
primary voltage, Ep = 5V
secondary voltage, Es = 6V
The number of turns in the secondary coil is calculated as;
[tex]\frac{N_s}{N_p} = \frac{E_s}{E_p} \\\\\frac{N_s}{50} = \frac{6}{5} \\\\N_s = \frac{50\times 6}{5} \\\\N_s = 60 \ turns[/tex]
Therefore, the number of turns in the secondary coil is 60 turns.
Q1) An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours.To cover the same distance in 1(2/3) hours, it must travel at a speed of;
A)300kmph
B)360kmph
C)600kmph
D)720kmph
Explain how you got the answer
Answers
Answer:
D) 720 kmph
Explanation:
First, let's find what distance this aeroplane covered. Distance (d) is the product of speed and time - here, we have a speed of 240 kmph and a time of 5 hours, gives us
[tex]d=240\cdot5=1200[/tex] km
Using that same fact, we can set up a new equation to solve for speed (s) when we have a distance of 1200 km and a time of 1 2/3 hours. For the sake of cleanliness, I'm gonna rewrite 1 2/3 as the improper fraction 5/3:
[tex]1200=(5/3)s[/tex]
Multiplying both sides of the equation by 3/5:
[tex]s=(3/5)(1200)=720[/tex] kmph
So our answer is D.
Answer: 720km/h
Explanation:
A satellite is in orbit 3.110106 m from the center of Earth. The mass of Earth is 5.98011024 kg Calculate the orbital
period of the satellite.
Answers
Answer:
9194.4278 seconds
Explanation:
Orbital period is given by :
T² = (4π²r³) /GM
G = Gravitational constant = 6.67 * 10^-11
M = 5.9801 * 10^24 kg
r = (3.110 * 10^6 m + 6378000 m) =3110000 + 6378000 = 9488000 m
T² = (4π² * 9488000^3) / (6.67* 10^-11 * 5.9801*10^24)
T² = 3.37197 * 10^22 / 398872670000000
T² = 84537504.161415
T = sqrt(84537504.161415)
T = 9194.4278 seconds
A force, 10 N drags a mass 10 kg on a horizontal table with an acceleration of 0.2
m/s2. If the acceleration due to gravity is 10 m/s2, the coefficient of friction between
the moving mass and the table is?
Answers
Answer:
20&£+)##&843&()-_££-()&_2+0&&-£_!)
How much force is required to accelerate a 14 kg mass at a rate of 2.5
m/s2?
Answers
Answer:
The answer is 35.
Explanation:
We use the formula F=ma
