Answer:
Light is faster in air than in glass so the speed of light decreases when it passes through glass.
This a solving question
Please please help
Answer:
Part A
The sound intensity at the location 150 from the firework = 4.3[tex]\overline 5[/tex] W/m²
Part B
The power the firework is emitting is approximately 1,231.5 kW
Explanation:
Part A
The data of the firework sound heard by the two friends are;
Let 'A' represent the location of the friend at a point 150 m from the fireworks and let 'B' represent the location of the friend watching from a distance of 700 m from the firework
The distance of 'A' from the sound, r₁ = 150 m
The distance of 'B' from the sound, r₂ = 700 m
The intensity at which 'B' hears the sound, I₂ = 0.2 W/m²
The relationship between sound intensity and distance is given as follows;
[tex]\dfrac{I_2}{I_1} = \left (\dfrac{r_1}{r_2} \right )^2[/tex]
[tex]\therefore {I_1} = \dfrac{I_2}{ \left (\dfrac{r_1}{r_2} \right )^2} = I_2 \times \left (\dfrac{r_2}{r_1} \right )^2[/tex]
Plugging in the values gives;
[tex]\therefore {I_1} = 0.2 \times \left (\dfrac{700}{150} \right )^2 = \dfrac{196}{45} = 4.3\overline 5[/tex]
The sound intensity at location 'A', I₁ = 4.3[tex]\overline 5[/tex] W/m²
Part B
The relationship between power, 'P', and intensity, 'I', is presented as follows;
[tex]I = \dfrac{P}{4 \cdot \pi \cdot r^2}[/tex]
P = I·4·π·r² = 4·I·π·r²
Therefore, at point 'A', where the distance, r₁ = 150 m, and the intensity, I₁ = 4.3[tex]\overline 5[/tex] W/m², we have;
P = 4 × 4.3[tex]\overline 5[/tex] W/m² × π × (150 m)² = 1231504.32021 W
The power the firework is emitting, P ≈ 1,231.5 kW.
Part F
How could you add more energy to the car?
Answer:
with fuel
Explanation:
Answer:
you can add more energy to the car by launching it again.
Explanation:
What conditions would probably exist the dew point and dry bulb temperatures to be the same at the ground ?
Answer: The conditions would probably exist the drew point and dry bulb temperatures to be the same at the ground because When the dew point temperature and air temperature are equal, the air is said to be saturated. Dew point temperature is NEVER GREATER than the air temperature. Therefore, if the air cools, moisture must be removed from the air and this is accomplished through condensation.
Explanation:
Since the air is said to be saturated when the dew point temperature and air temperatures are equal, the circumstances are likely present for the dew point and dry bulb temperatures to be equal at the ground. NEVER is the dew point temperature higher than that of the air temperature. As a result, condensation is used to remove moisture from the air when it cools.
What is dew point temperature?The dew point, under the assumption of constant air pressure and water content, is the temperature at which air must be chilled to become water vapor condenses. Airborne vapor will condense to create liquid water, known as dew, when it is cooled below the dew point, thereby moisture capacity. If this occurs via coming into contact with a cooler surface, dew will grow there.
Humidity influences the dew point. The dew point rises as the amount of moisture in the atmosphere increases.
To know more about dew point temperature:
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Which type of reaction is this?
CH3COOH + H20 2 H+ + CH3C00
Answer:
dissociation of acetic acid (like vinegar) in water
Explanation:
CH3COOH is basically vinegar (aka acetic acid)
dissociation of acetic acid in water
so when you put vinegar in water it makes 2 hydrogen ions (H+) and acetate ( CH3C00 ) a chemical that used in making film
The metric unit that is most often used to describe weight is the _________
Answer:
mass
Explanation:
mass is used in measuring weight. for example kg, tonnes
Three resistors of 100, 40.0, and
10.0 Ohms are in series with a
24.0 V power supply. What is the
current in the circuit?
Answer:
0.16 A
Explanation:
V = IRtotal
24V = I(100 + 40 + 10)
I = 0.16 A
Answer: 0.16 is correct
Explanation:
A Cathode of initial mass 10.00g weigh to 10.05g
after a Current of SA passes through the voltmeter of 10 minutes - Calculate the E.C.E of the metal deposed
Answer:
i'm sorry i'm not a physics student
The periodic wave in the diagram below has a frequency of 80. hertz.
What is the speed of the wave? (1) 13 m/s (2) 60. m/s (3) 27 m/s (4) 120 m/s
Answer:
hi how are you
2) 5/8
4) 5/8
how would you describe gravity?
Answer:
An intangible force that attracts objects to each other The weight of the Earth is what holds you on the ground and causes objects to fall.
Explanation:
Explanation:
I would describe it as a force that keeps Earth from floating away and keep us humans and other objects on earth's surface.
A 30 kg child is sitting on a swing. Their weight is exerting a downward force on the swing. The ropes are exerting an upward force on the swing. The swing is not moving. What is the net force on the swing?
A.294 N down
B.294 N up
C.0 N
D.30 kg
Of the 5000 species of mammals, 250 species are carnivorous. What is the ratio of carnivorous to mammals?
Answer: The ratio of carnivorous species to all mammal species is 1:20
Explanation:
250:5000 = 250/250 = 1
250:5000 = 5000/250 = 20
Answer = 1:20
Eye at the lowest radiated power of 1,2 x10 x (- 17) W. Determine how many photons of light with a wavelength of 500nm fall on the retina of the eye every second
Answer:
[tex]\frac{n}{t} = 30\ photons/s[/tex]
Explanation:
The radiated power can be given in terms of the wavelength as follows:
[tex]Rasiated\ Power = \frac{nE}{t} = \frac{nhc}{\lambda t}[/tex]
where,
Radiated Power = 1.2 x 10⁻¹⁷ W
n = no. of photons = ?
h = plank's constant = 6.625 x 10⁻³⁴ J.s
c = speed of light = 3 x 10⁸ m/s
λ = wavelength = 500 nm = 5 x 10⁻⁷ m
t = time
Therefore,
[tex]1.2\ x\ 10^{-17}\ W = \frac{n(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{(5\ x\ 10^{-7}\ m)(t) }\\\\\frac{n}{t} = \frac{1.2\ x\ 10^{-17}\ W}{3.975\ x\ 10^{-19}\ J}\\\\\frac{n}{t} = 30\ photons/s[/tex]
help meeeeeeeeeeeeeeeeeeeeeeeee
Answer:
Just like a chemical reaction.
Calculate the momentum of a 6 kg rock that is rolling down a hill with a velocity of 4 m/s.
Answer:
24kgm/s
Explanation:
momentum(p)=mass×velocity
=6×4
=24 kgm/s
pls help with science!!!!!
Answer:
Your answer is C~
Explanation:
A cannon and a supply of cannonballs are in a sealed system railroad car. The car has a length of 20 meters, and a mass of 2000kg. The cannon fires to the right, the car recoils to the left. Fired cannonballs remain in the car after hitting the wall and land on the floor at the end of the car. The cannonballs have a mass of 15 kg each, and there are ten of them. (neglect mass of cannon) How far will the car move after all ten have been fired
Answer:
The distance the car moves after all ten cannonballs have been fired is 1.5 meters
Explanation:
The parameters given in the question are;
The length of the car = 20 meters
The mass of the of the cannon ball, m₁ = 2,000 kg
The direction the cannon fires = The right
The direction the car recoils = The left
The mass of each cannonball, m₂ = 15 kg
The number of cannonballs = 10
Let v₁ represent the speed of the car and let v₂ represent the speed of the cannonball, where momentum is conserved, we have;
m₁·v₁ = m₂·v₂
2000 × v₁ = 15 × v₂
400·v₁ = 3·v₂
Therefore, when the cannon ball travels 400 meters, the railroad car travels 3 meters
Similarly, when the cannon ball travels 400/20 = 20 meters, the distance the railroad car travels, d = 3/20 meters
We not that the railroad car and the car are brought to a stop each time the cannonball hits the watt
Therefore, the total distance moved by the car after all ten have been fired, [tex]d_{total}[/tex], is given as follows;
[tex]d_{total}[/tex] = d × The number of balls fired
∴ [tex]d_{total}[/tex] = 3/20 meters per ball × 10 balls = 3/2 meters = 1.5 meters
The total distance moved by the car, [tex]d_{total}[/tex] = How far the car moves after all ten have been fired = 1.5 meters.
A 1220-w hair dryer is used by several members of the family for a total of 30 min per day during a 30 day month. How much elecrical energy is consumed by the hair dryer during the month give your answer in kilowatt hours
Answer:
Energy = 18.3 Kilowatt-hour
Explanation:
Given the following data;
Power = 1220 Watts
Time = 30 * 30 = 900 minutes to hours = 900/60 = 15 hours
To find the energy consumption;
Power can be defined as the energy required to do work per unit time.
Mathematically, it is given by the formula;
[tex] Power = \frac {Energy}{time} [/tex]
Making energy the subject of formula, we have;
Energy = power * time
Energy = 1220 * 15
Energy = 18300 Joules
To convert energy to Kilowatt-hour;
Energy = 18300/1000
Energy = 18.3 Kilowatt-hour
A(n) _________ is an object that is thrown.
Answer:
projectile
Explanation:
Answer:
the answer is projectile
Explanation:
this is because like take a nerf gun for example when u fire it PROJECTS the dart from the gun. may i be marked brainliest?
Which product forms from the synthesis reaction between calcium (Ca) and
chlorine (CI)?
A. CaCl2
B. CaCl
C. Ca2Cl2
O D. Caci
SUBMIT
Answer:
CaCl2
Explanation:
Answer:
its a! the answer is a
Explanation:
A 5kg object is moving downward at a speed of 12m/s. If it is currently 2.6m above the ground, what is its kinetic energy?
Answer:
360J
Explanation:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
NO LINKS OR NON USEFUL ANSWERS!!!!!!!! What makes a screw able to hold more or less weight?
Answer:
thread
Explanation:n general, a screw can hold 80-100 pounds. Several factors can impact on the amount of weight the screw can hold. This includes the length of the screw, the type of thread, the quality of the screw, the way it was inserted, and the type of forces that will be acting on it.
Which of the following is a result of a limiting factor in an ecosystem?
a. A pond has only produced a small amount of algae, so the fish population is also small.
b. The weather was extra humid last summer and there were more mosquitos than ever before.
c. A farmer planted new grass and months later his animals looked healthier than they’ve looked in years.
d. This year, ticks are supposed to be worse than in previous years, with a huge number of them carrying Lyme Disease.
Answer:A - a pond has only produced a small amount of algae, so the fish population is also small. i’m pretty sure that’s correct.
Explanation: The amount of alage determines the size,or carrying capasity of the fish population,so it is a limiting factor.
Hope I could help!Brainlist?plz
Smaller the surface area greater the gravitational force and vice–versa yes or no? justify the statement.
Answer:
It is true that Smaller the surface area greater the gravitational force and vice versa
Explanation:
The gravitational force depends on the distance between the two objects
F=GMm/r2
where G = gravitational constant
M = mass of one object
m = mass of second object
r is the distance between the two objects
Gravitational force is inversely proportional to the square of the distance between two objects. Hence, it can be said the Gravitational force is inversely proportional to the area and hence as the area increases gravitational force will decrease or vice versa
Which indicates that light travels in straight lines?
A. Color
B. Pigments
C. Shadows
D. Waves
Answer:
A
Explanation:
Answer:
C
Explanation:
Light travels in straight lines
Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow.
Ali mixes 20g of Sodium Chloride in 100g of water at 15 Degree °C. Calculate the mass of the solution
Answer:
The mass of the solution is 120 g.
Explanation:
The mass of the solution is given by:
[tex] m_{sol} = m_{1} + m_{2} [/tex]
Where:
[tex]m_{sol}[/tex]: is the mass of the solution
[tex]m_{1}[/tex]: is the mass of the solvent
[tex]m_{2}[/tex]: is the mass of the solute
In the solution, the solvent is the majority compound (in mass) and the solute is the minority (in mass), so the solvent is the water and the solute is sodium chloride.
Hence, the mass of the solution is:
[tex] m_{sol} = m_{1} + m_{2} = 100 g + 20 g = 120 g [/tex]
I hope it helps you!
In which of the following situations is the Doppler effect absent?
ASAPPPPP NO LINKS PLSSSS *FOR TEST TOMORROW*
Meanings for:
- Automation
- Fulcrum
- Consumerism
Automation:
1. The creation and application of technology to monitor and control the production and delivery of products and services.
2. The use of machines and technology to make processes run on their own without manpower.
Examples to make you understand better:
Automations are in Meetings, Hiring Process, Employee Analytics.
Quote:
"In manufacturing, a system or method in which many or all of the processes of production, movement, and inspection of parts and materials are automatically performed or controlled by self-operating machinery, electronic devices, etc."
Fulcrum:
Picture Included.
1. The support about which a lever turns
2.The support or point of support on which a lever turns in raising or moving something
Consumerism:
Quote:
"Consumerism has a good and bad side. Although consumerism drives economic growth and boosts innovation, it comes with a fair share of problems ranging from environmental and moral degradation to higher debt levels and mental health problems."
Definition:
1. "The growth of consumerism has led to many organizations improving their service to the customer"
2. Spending money and consuming goods is good for the economy.
3. The protection or promotion of the interests of consumers.
I hope this helped!+*♡
A lens with f=15.0 cm is held 29.0 cm from an object. Where does the image form
Answer:
Magnification, m = 3
Explanation:
It is given that,
Focal length of the lens, f = 15 cm
Object distance, u = -10 cm
Lens formula :
v is image distance
Magnification,
So, the magnification of the lens is 3.
Answer:
31.1
Explanation:
Trust brother
help meeeeeeeeeeee
what is the rheostat and what its ruleeee??
Answer:
Rheostat:=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.
Principle / Rule:=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.
[tex] \infty \infty \infty [/tex]
1. Jen is stepping out of a boat on to a dock. She has one foot on the dock and one foot in
the boat. No one holds on to the boat. It begins to move away from the dock. Jen's legs
split wider and wider. Which law applies?
you tend to push off with the foot still on the boat.
Newtons 3rd law of motion hold that every action has an equal and opposite reaction.
So, the amount of force you use on your back foot to push yourself onto the dock, has an equal end opposite amount of force going the other way from your sole of your foot, which pushes the boat the other way.
The same principle applies when you fire a cannon - in the pirate films, you see the body of the cannon forced back as it is fired.
Take it one step further, Henry VIII flagship, “Mary Rose fired all its cannons together one day in a broad side, the opposite force rolled the ship over and sank it.
