Answer:
the electric and magnetic fields that make up an electromagnetic wave are perpendicular (at right angles) to each other. Both fields are also perpendicular to the direction that the wave travels. Therefore, an electromagnetic wave is a transverse wave.
Explanation:
Question 2 (1 point)
This graph shows an object in free fall. Assume there is no air resistance. What is the only force acting on this object?
Answer:
Actually, there is no force (felt by the object) acting on the object.
It is similar to an object in orbit around the earth (weightlessness)
F = M a describes the motion of the particle where
M a = M g where the acceleration of the particle is equal to the force of gravity acting on the particle
From an external view the only force acting on the particle is M g and it produces an acceleration of M g
There is no force felt by the freely falling body. The cause of free fall is gravitational pull. Where Acceleration is equal to the gravitational acceleration. According to Newton's Law of Gravitation , two bodies attract each other due to their masses and separation , since earth is a very big body therefore the lit body falls towards the earth . Thus the graph plotted is a straight line.
What is Newton's law of Gravitation?
"The force acting between two bodies is directly proportional to product of masses and inversely proportional to the square of the separation ."
F= G.{m_{1} . m_{2} }/r^{2}.
Hence the only force by which the object is falling is gravitational pull.
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A car is traveling on the road at a velocity (Vx) of 35m/s. A person in the passenger seat
has a tennis ball and is tossing the ball up in the air to himself. He throws the ball directly up
with a velocity (Vy) of 3m/s. An outside observer is sitting on a bench on the side of the street
watching the car pass.
a) To the person inside the car, the ball travels directly up and down. But to the
outside observer, what is the launch angle of the ball?
b) What is the ACTUAL Speed (IVI) of the ball when it leaves the person's hand?
c) What is the maximum height the ball will reach in the car?
d) How long will the ball stay in the air?
e) How far will the ball travel in the direction of travel on the road?
(a) The launch angle of the ball is 5⁰.
(b) The actual speed of the ball when it leaves the person's hand is 35.13 m/s.
(c) The maximum height reached by the ball is 0.46 m.
(d) The time spent in air by the ball is 0.26 s.
(e) The horizontal distance traveled by the ball on the road is 4.55 m.
Launch angle of the ball
The launch angle of the ball is calculated as follows;
[tex]tan(\theta) = \frac{V_y}{V_x} \\\\\theta = tan^{-1} (\frac{3}{35} )\\\\\theta = 5\ ^0[/tex]
Actual speed of the ballThe actual speed of the ball when it leaves the person's hand is calculated as follows;
[tex]V = \sqrt{V_x^2 + V_y^2} \\\\V = \sqrt{(35)^2 + (3)^2} \\\\V = 35.13 \ m/s[/tex]
The maximum height reached by the ballThe maximum height reached by the ball is calulated as follows;
[tex]Vy_f^2 = V_y_i^2 - 2gh\\\\0 = 3^2 - 2(9.8)(h)\\\\19.6h = 9\\\\h = \frac{9}{19.6} \\\\h = 0.46 \ m[/tex]
Time spent in air by the ballThe time spent in air by the ball is calculated as follows;
[tex]h=V_yt + \frac{1}{2} gt^2\\\\0.46 = 3t + 4.9t^2\\\\4.9t^2 +3t - 0.46 = 0\\\\a = 4.9, \ b = 3, \ c =- 0.46\\\\t = \frac{-b \ \pm \ \sqrt{b^2 - 4ac} }{2a} \\\\t = 0.13 \ s[/tex]
Total time for upward and downward motion = 2(0.13 s) = 0.26 s
Horizontal distance traveled by the ballX = Vx(t)
X = 35 x 0.13
X = 4.55 m
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the reading on an electric meter was 2345 kWh, and one month later it was 3456 kWh. how much was the electric bill if the electricity costs $0.10 per kilowatt-hour?
An electric meter reads 2345 kWh and 3456 kWh a month later. At $0.10/kWh, the bill for this energy consumption will be $111.1.
What is a kiloWatt-hour?A kiloWatt-hour (kWh) is a unit of energy equal to one kilowatt of power for one hour.
Step 1. Calculate the energy consumption in one month.The energy consumption will be equal to the difference between both readings.
E = 3456 kWh - 2345 kWh = 1111 kWh
Step 2. Calculate the cost of the bill.The cost of electricity is $0.10/kWh.
1111 kWh × $0.10/kWh = $111.1
An electric meter reads 2345 kWh and 3456 kWh a month later. At $0.10/kWh, the bill for this energy consumption will be $111.1.
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i need help please!!
Answer:
on the axis ties and greph
Community psychologists are not
concerned with worker stress factors.
True
False
PLEAASEEEE HELPP ASSPPP SHORT RESPONSE WILL GIVE BRAINLY
Australia's skin cancer rate is so high. The Australian Health Alliance has asked you to write a short argument that explains this to the Australian public. Remember to
explain how your evidence supports your claim to make your argument as complete and convincing as possible. You can agree with one or both of the claims.
Question: Why is Australia's skin cancer rate so high?
Claim 2: There is something different about the sunlight in Australia.
Claim 3: More people in Australia have skin that is easily damaged by sunlight.
Answer:
Claim 2
Explanation:
Australia's skin cancer rate is so high because of the climate and the weather in their area. It is also because since australia is on the bottom of the globe, the continent recieves higher UV radiation.
Thanks for the brainliest!
1.Australia has one of the highest rates of skin cancer in the world. This is due largely to our climate, the fact that many of us have fair skin that isn't really suited to such harsh conditions, our proximity to the equator (high UV levels) and our social attitudes and love for the outdoors.
2.Australia's unusually harsh sunshine results mainly from its location in the Southern Hemisphere. The elliptical orbit of the Earth places the Southern Hemisphere closer to the sun during its summer months than the Northern Hemisphere during its summer.
3.Basically, through migration, our two countries have been populated by many people with fair skin whose ancestors come from much less sunny climates. Lack of protective pigmentation leaves skin cells especially vulnerable to the DNA-damaging rays from the sun.20 Mar 2018
From a penalty kick, the ball rebounds off the goalkeeper back to the player who took the kick. That player then kicks the ball into the goal. What is the correct restart
The correct restart is for there to be another kick off taken in this type of scenario.
What is Kick-off in Soccer?This is a method of restarting play in which the ball is put on the center circle and passed by a player.
Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
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Answer:Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
Explanation:
Which of the following is a component of all galaxies?
A. Objects that contain dust and gas
B. Objects that orbit the stars
C. Objects that orbit the sun
D. Objects that shine in the sky
Answer:
Objects that orbit the sun
Explanation:
Answer: A. Objects that contain dust and gas
Explanation: All galaxies have dust and gas. Answer C is incorrect because the answer says "the sun" how would and how would multiple galaxies have objects that orbit our sun?
(Oh, btw it's C I'm just messing with you guys)
What is the weight of a box with a mass of 150 kg on Earth?
N
Use g= 9.81 m/s2 and do not include units in your answer.
Answer:
W = M g = 150 kg * 9.81 m/s^2 = 1470 N
You were only given 3 significant figures in the question.
The weight of the box is 1471.5 N.
What is weight?In science and engineering, an object's weight is defined as the force of gravity acting on the thing. Weight is sometimes described as a vector quantity in common textbooks, denoting the gravitational force acting on the item.
Given parameters:
Mass of the box, m = 150 kg.
Acceleration due to gravity, g = 9.8 m/s².
Hence, weight of the box is, W = mg = 150 kg × 9.81 m/s² =1471.5 N.
SO, weight of the box with a mass of 150 kg on Earth is 1471.5 N.
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b. The silica cylinder of a radiant wall heater is 0.6 m long
and has a radius 6 mm. If it is rated at 1.5 kw estimate
its temperature when operating. [The Stefan constant,
6=6 x 10-8 wm-2-4)
Ans: 1025 K
So, If the silica cyliner of the radiant wall heater is rated at 1.5 kw its temperature when operating is 1025.3 K
To estimate the operating temperature of the radiant wall heater, we need to use the equation for power radiated by the radiant wall heater.
Power radiated by the radiant wall heaterThe power radiated by the radiant wall heater is given by P = εσAT⁴ where
ε = emissivity = 1 (since we are not given), σ = Stefan-Boltzmann constant = 6 × 10⁻⁸ W/m²-K⁴, A = surface area of cylindrical wall heater = 2πrh where r = radius of wall heater = 6 mm = 6 × 10⁻³ m and h = length of heater = 0.6 m, and T = temperature of heaterSince P = εσAT⁴
P = εσ(2πrh)T⁴
Making T subject of the formula, we have
Temperature of heaterT = ⁴√[P/εσ(2πrh)]
Since P = 1.5 kW = 1.5 × 10³ W
Substituting the values of the variables into the equation, we have
T = ⁴√[P/εσ(2πrh)]
T = ⁴√[1.5 × 10³ W/(1 × 6 × 10⁻⁸ W/m²-K⁴ × 2π × 6 × 10⁻³ m × 0.6 m)]
T = ⁴√[1.5 × 10³ W/(43.2π × 10⁻¹¹ W/K⁴)]
T = ⁴√[1.5 × 10³ W/135.72 × 10⁻¹¹ W/K⁴)]
T = ⁴√[0.01105 × 10¹⁴ K⁴)]
T = ⁴√[1.105 × 10¹² K⁴)]
T = 1.0253 × 10³ K
T = 1025.3 K
So, If the silica cylinder of the radiant wall heater is rated at 1.5 kw its temperature when operating is 1025.3 K
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A torsional oscillator has a period of 0.45 s. If its rotational inertia is 0.25 kg-m2, what is the torsional spring constant of its spring
The torsional spring constant of the torsional oscillator (I = 0.25 kg · m² and T = 0.45 s) has a magnitude of 48.738 newton-meters.
How to determine the constant of a torsional spring
The torsional spring constant indicates the resistance of the spring to an external moment. The torsional spring constant (κ), in newtons per meter, can be found by means of this formula in function of the period (T), in seconds and the moment of inertia (I), in kilograms per square meter:
[tex]\kappa = \frac{4\cdot \pi^{2}\cdot I}{T^{2}}[/tex] (1)
If we know that I = 0.25 kg · m² and T = 0.45 s, then the torsional spring constant of the spring is:
[tex]\kappa = \frac{4\cdot \pi^{2}\cdot (0.25\,kg\cdot m^{2})}{(0.45\,s)^{2}}[/tex]
κ = 48.739 N · m
The torsional spring constant of the torsional oscillator (I = 0.25 kg · m² and T = 0.45 s) has a magnitude of 48.738 newton-meters. [tex]\blacksquare[/tex]
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The Mechanical Advantage equation is written as ___
Is it possible for a person to have zero mechanical energy? Why or why not?
Answer: No
Explanation:
There are a few explanations as to why. I'm not sure as to what level of an explanation you are looking for. A person's body is made of atoms, which have constant motion due to multiple processes. An atom can never ever be frozen to absolute zero motion, we can only approach that value. Therefore, we will always have kinetic energy. Another explanation is Einstein's famous formula E = mc^2. This is the rest mass energy, which all things with mass obey. There is an energy-mass equivalence.
Photophores help the animals which zone of the ocean? how do they help?.
Please help meeeeeeeeeeeeeeee
probabilityAnswer:
2/27
Explanation:
The elk can not be eaten so we remove that from the probablity
so we have x/18
songbird = 4/18
mice = 6/18
4/18*6/18 = 2/27
1. ….. has no definite shape or size
A. Solid
B. Liquid
C. Gas
D. Plasma
2. Distance traveled per unit of time is..
A. Velocity
B. Speed
C. Motion
D. Acceleration
3. The SI unit of pressure is the..
A. Pascal
B. Atmosphere
C. Torr
D. Bar
( please help me)
Answer:
See below ↓↓↓
Explanation:
1. C. Gas
Gases are classified as a state of matter which has no definite shape or sizeLiquids are commonly confused with gases in this manner, but remember liquids take the definite shape of the container if poured in, gases are not so2. B. Speed
As the term "distance" is given, it is definitely speedOn the other hand, if "displacement" was given, then it would be velocity3. A. Pascal
All of the options are units of pressureBut, the SI unit is actually N/m², which otherwise commonly called Pascal1. The transfer of heat by means of the movement of a substance is known as…
A. Conduction
B. Convection
C. Radiation
D. Transpiration
2). Which form of energy does a plant store when light is transformedduring photosynthesis?
A. Chemical energy
B. Thermal energy
C. Mechanical energy
D. Electrical energy
3.) telephones use electromagnets to change…
A. Electric currents to light waves
B. Electric currents to sound waves
C. Magnetism to light waves
D. Magnetism to sound waves
(( pleaaseee heelp meee))
Answer:
1 A 2 d 3 b. okjajsnsnzbsbsbsbsbExplanation:
okk
Lewis structure for BeCI2
Answer:
you can see it in the picture
what is the mass of 2.4 moles of water
Answer:
43.2
2.4×18
18 is the molar mass of water
multiply the no of moles with the molar mass to find the mass of the substance
Answer:
43.25 grams
Explanation:
one mole of H2O is 18.02 grams
18.02*2.4=43.248 grams
Use the passage to answer the question.
Light travels from the stars to Earth. As light travels, it moves through the empty vacuum of space. This is not something that waves do, because they need a medium to travel through, while particles do not. This shows that the particle model is best for explaining this phenomenon.
What is the reasoning in this passage?
(1 point)
Light travels from the stars to Earth.
As light travels, it moves through the empty vacuum of space.
This shows that the particle model is best for explaining this phenomenon.
This is not something that waves do because they need a medium to travel through, while particles do not.
This is not something that waves do because they need a medium to travel through, while particles do not.
How light travels in space?A light travels without any medium while on the other hand, a medium is required for sound waves to move from oe place to another. Sound is a mechanical wave that cannot travel through a vacuum.
So we can conclude that electromagnetic waves like light do not require medium for its propagation.
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Which of the following statements is true?
A spark causes combustion in a gasoline engine.
All oxidation reactions cause explosions.
Batteries were invented during the 20th century.
All oxidation reactions absorb heat.
if their is no pivot can rular turn? explain?
Answer:
No
Explanation:
Because there won't be any momentum
Answer:
No, because you need momentum and you won’t have any momentum there.
Explanation:
I apologize if it is incorrect-
I hope it helps! Have a great day!
Anygays-
There are ___ particles that make up an atom which are the smallest unit of an ___.
Answer:
subatomic, element
Explanation:
Subatomic particles are protons, neutrons, and electrons. Atoms are the smallest unit of an element.
What are dogs trained to do when they find an explosive device?.
Answer:
They sit or lay quietly
Explanation:
That's what they are trained to do when they find a explosive device
Describe mathematically how two distinct waves each with wave functions like the one in eq. 2 – call them y1 and y2 – will combine. We call this interaction the principle of superposition.
The resultant wave of the different wave functions is = y1 + y2
Calculation of the resultant wave functionsThe principle of superposition states that two waves moving through the same medium, the resultant value of the wave function is the sum of the different wave functions.
Waves superimpose by adding their disturbances,each disturbance corresponds to a force, and all the forces add.
Therefore, the resultant wave of the different wave functions is the addition of both wave functions which is = y1 + y2.
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what is the voltage of a circuit with power 36 W and current 4.5 A
Answer:
8 v
Explanation:
power = watts = v i
36 = v (4.5)
v = 8 v
What are the differences between tidal power and hydroelectric power?
Thanks to anyone who helped
Answer: With Hydroelectric power water is artificially stored in a high place, so it can be released and flow to a low place and through a generator. With Tidal energy the movement of water is also used to power a generator, but the flow of water is caused by the changing tides.
which statment about scientific knoledge is false
An object initially at rest on a horizontal surface is set into motion by the application of a force. Does the force of friction between the object and the surface decrease, increase, or remain the same immediately after the object starts to move?
Answer:
C always
Explanation:
The force of friction between the object and the surface decrease immediately after the object starts to move.
What is friction?The force preventing solid surfaces, fluid layers, and material components from sliding past one another is known as friction.
The definition of static friction is: The resistance people feel when they attempt to move a stationary object across a surface without actually causing any relative motion between their body and the surface they are moving the object across.
The resistance that is formed between any two items when they are sliding against one another is known as sliding friction.
It is experimentally proved that the force of friction between the object and the surface decrease, immediately after the object starts to move.
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Which famous astronomer discovered jupiter’s largest moons?.
Answer:
Galileo Galilei
Explanation:
The famous astronomer Galileo Galilei was the one who discovered Jupiter’s large moons.
I hope it helps! Have a great day!
Muffin ^^
Answer:
Galileo Galilei
Explanation:
The great and famous astronomer Galileo Galilei was the one that discovered Jupiter’s largest moons.
I hope it helps! Have a great day!
Anygays-
