Complete Question:
Light from the sun travels in electromagnetic waves. Which of these statements describe electromagnetic waves? Choose the 3 that apply.
Group of answer choices.
a) consist of transverse wave patterns.
b) can move through a vacuum.
c) caused by a vibration in a medium.
d) consist of longitudinal wave patterns.
e) requires a medium, such as air, to travel.
f) made of vibrating electric and magnetic fields.
Answer:
a) consist of transverse wave patterns
b) can move through a vacuum
f) made of vibrating electric and magnetic fields
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
Generally, the most commonly used electromagnetic wave technology in telecommunications is light and radio waves. Light from the sun travels in electromagnetic waves.
The statements which describe electromagnetic waves are;
I. It consist of transverse wave patterns.
II. It can move through a vacuum.
III. It is made of vibrating electric and magnetic fields.
The wavelength of a sound wave is 30 m. The frequency is 7 Hz. What is the wave speed?
210 m/s
4.29 m/s
Answer:
210m/s
Explanation:
To find the speed of wave you need to multiply the wave length with the frequency.
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Most of the mass of an atom is concentrated predominantly…
a=in the nucleus
b=in the electrons
c=in the neutrons
d=in the positrons
Answer:
A
Explanation:
Calculate the force acting
on a body whose linear momentum changes by 10 kg m/s
in 5 seconds.
Answer:2n
Explanation:10/5=2
On Planet Y, which has no air, a dropped object falls 9 m in 3 seconds. What is g, the acceleration due to gravity, on that planet?
9.8 m/s2
3 m/s2
2 m/s2
Answer:
a = 2 m/s^2
which agrees with the third answer option provided.
Explanation:
Recall the kinematic formula for displacement under the action of a constant acceleration "a":
yf - yi = 1/2 a t^2
using the information provided this equation becomes:
9 = 1/2 a (3)^2
solve for a:
9 * 2 / 9 = a
then a = 2 m/s^2
which agrees with the third answer option provided.
What types of human and animal behavior are "complex, unlearned, and rigidly patterned"?
Answer:
Instincts
Explanation:
instincts are complex, unlearned behaviors that are present throughout a species and genetically transmitted.
Exercising in hot weather can cause what side effects ?
Answer:
dehydration, lots of sweating, heat stroke, heat exhaustion: nausea, dizziness, vomitting, diahreaa, headache
Explanation:
Water of mass 100 g at a temperature of 100 °C is converted into steam at 100 °C. The specific
latent heat of vaporisation of water is 2300 J/g.
How much thermal energy is absorbed by the water?
0 230 000
0 23 000 000 J
0 230 J
O 23 J
Answer:
The thermal energy absorbed by the water is 230,000 J.
Explanation:
Given;
mass of the water, m = 100 g
The specific latent heat of vaporization of water, L = 2300 J/g
temperature of the steam, θ = 100 °C
The thermal heat capacity or thermal energy absorbed by the water is calculated as follows;
H = mL
H = 100g x 2300J/g
H = 230,000 J
Therefore, the thermal energy absorbed by the water is 230,000 J.
Therefore
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Friction _____.
A) is always and unwanted force
B) works in the opposite direction of motion
C) causes machines to work 100 percent efficiently
D) can be increased using lubricants, like oil
Answer:
works in the opposite direction of motion
write an essay about the Paralympic and Special Olympic Essay 100 points
soooo
Explanation:
dont know
Answer:
Its 50 points for me but ok 100 4 u nice uh... here. Bringing the 1996 Summer Olympic Games to Atlanta was a long shot. Athens, Greece, was the sentimental favorite to host the centennial games, and tension was palpable as IOC President Juan Antonio Samaranch made the announcement back on Sept. 18, 1990.
"The International Olympic Committee has awarded the 1996 Olympic Games to the city of ... Atlanta," Samaranch revealed.
That announcement launched more than $1 billion of construction projects, from Olympic venues to housing for the athletes. Now, on the 15th anniversary of the games, Atlanta sees both gains and losses from the international event. Bringing the 1996 Summer Olympic Games to Atlanta was a long shot. Athens, Greece, was the sentimental favorite to host the centennial games, and tension was palpable as IOC President Juan Antonio Samaranch made the announcement back on Sept. 18, 1990.
"The International Olympic Committee has awarded the 1996 Olympic Games to the city of ... Atlanta," Samaranch revealed.
That announcement launched more than $1 billion of construction projects, from Olympic venues to housing for the athletes. Now, on the 15th anniversary of the games, Atlanta sees both gains and losses from the international event.
One of the most prominent legacies of the games is Centennial Olympic Park in the heart of Atlanta. The 21-acre plaza glistens in what was an area of urban decay, and children run and linger in the fountain.
Harvey Newman, a professor of public policy at Georgia State University, says the park brought economic development downtown.
"The area surrounding the park has added major hotels, condominiums, new office structures and, of course, people continue to flock to enjoy the Olympic rings fountain," Newman says.
Explanation:
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explain how a student could appropriate measurements and use them to determine the wavelength of the waves in the ripple tank.
Answer:
Measure the length of a number of waves then divide by the number of waves to calculate the wavelength. wavelength. Count the number of waves passing a point in ten seconds then divide by ten to record frequency. Calculate the speed of the waves using: wave speed = frequency × wavelength.
what is types of motion
Answer:
In the world of mechanics, there are four basic types of motion. These four are rotary, oscillating, linear and reciprocating. Each one moves in a slightly different way and each type of achieved using different mechanical means that help us understand linear motion and motion control
Which statement describes an example of constructive interference?
A. Two TV signals reach an antenna and cancel each other out.
B. A cell-phone signal is lost when you pass through a certain area.
C. oil spilled in a water puddle shows different colors of light.
D. Light forms bars on a surface after passing through two slits.
Light that has passed through two slits and formed bars on a surface is an example of constructive interference.
Which of the following describes constructive interference?Constructive interference is the phenomenon where the total amplitude of two waves is equal to the sum of their separate amplitudes when two waves are in phase and their maxima add.
What is two-wave constructive interference?A single amplitude equal to the sum of the individual wave amplitudes is produced by the mutual reinforcement of two or more waves of similar frequency and phase during constructive interference. Phase differences between waves must be zero for constructive interference to occur.
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Describe your observations about the mid-ocean ridge. What did it look like? How do you think it got there?
(subject science)
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Create a poem or a song explaining the principles of force and motion. Use at least 5 of these terms in your work: inertia, unbalanced force, balanced force, net force, gravity, speed, acceleration, velocity, Newton’s Laws.
Answer:
the laws of motion is what keeps everything going an back without gravity they couldn't been no us . let them say what they was but newton knows best if they want to come an say newtons discovery changed the world without him we couldn't rest
helpppppppp pleaseeeee
give one
excemple where friction is a
hindrance
1) In machines, efficiency reduces due to friction has energy may be lost as heat. 2) When one falls and slides over rough surface like cement, then the injury caused is more.
Clayton tries to build an electric circuit using a battery, a light bulb, a paper clip, and copper wire. The diagram below shows what he builds.
Which claim best explains why the circuit would not conduct electricity?
a. The circuit lacks a power source.
b. The circuit is not a complete loop
c. The light bulb uses the electric current.
d. The paper clip stops the electric current.
Answer: letter B
Explanation:
As you can see the battery only has one wire connected to it thus not a complete loop
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what is the mass of 3 m3 of a substance having density 1200 kg/m3
Answer:
3600 kg
Explanation:
From the question,
Density = Mass/Volume
D = M/V.............................. Equation 1
Where D = Density of the substance, M = mass of the substance, V = Volume of the subtance.
Make M the subject of the equation
M = D×V ............................ Equation 2
Given: D = 1200 kg/m³, V = 3 m³.
Substitute these values into equation 2
M = 1200×3
M = 3600 kg.
Hence the mass of the substance is 3600 kg
Why do we add the masses together after that inelastic collision?
Answer:An inelastic collision is one in which the internal kinetic energy changes (it is not conserved). A collision in which the objects stick together is sometimes called perfectly inelastic because it reduces internal kinetic energy more than does any other type of inelastic collision.People sometimes think that objects must stick together in an inelastic collision. However, objects only stick together during a perfectly inelastic collision. Objects may also bounce off each other or explode apart, and the collision is still considered inelastic as long as kinetic energy is not conserved.
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Explanation:
what is someones target heart rate at 70% at age 17
Answer: normal
Explanation:
What is the energy required to change 600g of liquid into steam if the specific heat latent is 4000 J/kg
Answer:
2400 J
Explanation:
Latent heat: This is also called hidden heat, it is the heat that is not detectable by the thermometer.
From the question,
Q = cm.................. Equation 1
Where Q = Energy, c = specific latent heat of the liquid, m = mass of the liquid.
Given: c = 4000 J/kg, m = 600 g =( 600/1000) kg = 0.6 kg
Substitute these values into equation 1
Q = 4000×0.6
Q = 2400 J
Hence the energy required is 2400 J
Object 1 starts at 5.4m and moves with a velocity of 1.3m/s. Object 2 starts at 8.1m and moves with a velocity of -2.2m/s. At what time will these two objects collide. *
PLEASE A GOOD ANSWER. IM NEED HELP RN
Answer:
The time after which the two objects will collide is approximately 0.77 seconds
Explanation:
Given that Object 1 and Object 2 start from a point relative to a common reference location, and have the following parameters;
The location Object 1 starts from = 5.4 m from the reference location
The velocity of Object 1, v₁ = 1.3 m/s
The location Object 2 starts from = 8.1 m from the reference location
The velocity of Object 2, v₂ = -2.2 m/s (the direction of the velocity is opposite to the direction of v₁)
Therefore, the distance between Object 1 and Object 2 when they start, 'd', is given as follows;
d = 8.1 m - 5.4 m = 2.7 m
At the time, 't', that elapse when the two objects collide, and given that the objects are moving in opposite direction, we have;
v₁·t - v₂·t = d
Plugging in the values of the variables, we get;
1.3 m/s × t - (-2.2 m/s) × t = 2.7 m
∴ t × (1.3 m/s + 2.2 m/s) = t × 3.5 m/s = 2.7 m
t = 2.7 m/(3.5 m/s) = (27/35) s = [tex]0.7 \overline{714285}[/tex] s ≈ 0.77 s
The time after which the two objects will collide, t ≈ 0.77 seconds.
If we could easily create machines or systems with no friction, what could we use them for?
If we did use zero-friction machines for these purposes, how would our everyday lives change?
Answer:
We could make a frictionless generator.
Explanation:
This would change life by making the cost for energy next to zero
what happens to denstity of air as altitude decreases
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A train traveling at a constant speed rounds a curve of radius 225 m . A lamp suspended from the ceiling swings out to an angle of 14.5 ∘ throughout the curve. What is the speed of the train?
Answer:
[tex]v = 23.88m/s[/tex]
Explanation:
Given
[tex]r = 225m[/tex]
[tex]\theta = 14.5^\circ[/tex]
Required: Determine the speed of the train
To solve this question, we apply the concept of tension.
Let the tension on the cord be T.
Tension is calculated as:
[tex]T = mg[/tex]
So, the tensions acting on the system are:
[tex]T*sin(\theta) = \frac{mv^2}{r}[/tex] and
[tex]T*cos(\theta) = mg[/tex]
Divide the equations by one another
[tex]\frac{T*sin(\theta)}{T * cos(\theta)} = \frac{mv^2}{mgr}[/tex]
[tex]\frac{sin(\theta)}{cos(\theta)} = \frac{v^2}{gr}[/tex]
[tex]tan(\theta) = \frac{v^2}{gr}[/tex]
Make v^2 the subject
[tex]v^2 = grtan(\theta)[/tex]
Take the square root of both sides
[tex]v = \sqrt{grtan(\theta)[/tex]
Substitute values for g (9.8), r 225 and [tex]\theta[/tex] (14.5)
[tex]v = \sqrt{9.8 * 225 * tan(14.5^\circ)}[/tex]
[tex]v = \sqrt{9.8 * 225 * 0.2586}[/tex]
[tex]v = \sqrt{570.213}[/tex]
[tex]v = 23.88m/s[/tex]
Hence, the trains' velocity is approximately 23.88m/s
A 150 N boy rides a 60 N bicycle a total of 200 m at a constant speed. The frictional force against the forward motion of the bicycle equals 35 N. How much work does the boy do? (Hint: Do sum of all forces first.)
Answer:
W = 7000 J
Explanation:
To solve this problem we use that the speed of the bicycle is constant, therefore its acceleration is zero
F -fr = 0
F = fr
where F is the force applied by the child
Work is defined by
W = F. x
W = F x cos θ
in this case the child's force is parallel to the movement, therefore the angle is zero and cos 0 = 1
let's calculate
W = 35 200
W = 7000 J
select th
An isotope of uranium contains 92 electrons, 92 protons, and 140 neutrons. The notation for this
isotope is
Answer:
232
U
92
Explanation:
mass number=protons add neutrons
Atomic number= amount of protons
When an electric current passes through a wire a magnetic field is formed, this is called______________.
A) Atomic force
B) Intermolecular force
C) Electromagnetism
D) Nuclear spin
(PHYSC) HELPPPP Individuals suffering from somatoform disorders often see several doctors about their symptoms because __________.
A.
doctors often refer their patients for a second opinion
B.
their symptoms often fall under several specialties
C.
doctors get frustrated with them and refuse to treat them
D.
they are looking to find a doctor to give them a diagnosis
Answer:
D.
they are looking to find a doctor to give them a diagnosis
Explanation:
cause I had this answer
Individuals suffering from somatoform disorder generally see many doctors as they are often referred for a second opinion.
What is somatoform disorder?The somatoform disorder also known as a somatic symptom disorder refers to any mental disorder, which displays as physical symptoms that suggest injury or illness. However, it cannot be explained completely by a general medical condition or by the direct effect of a substance.
They are also not attributable to another mental condition like panic disorder. For the individuals diagnosed with somatoform disorder, the results of the medical test either do not explain the symptoms of the person or are either normal.
Therefore, the person with the somatoform disorder generally visits many doctors as they are often referred for a second opinion.
Thus, the correct statement is option A.
Find out more information about somatoform disorder here:
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Find the total current, I and the voltage across each components? Show all the workings clearly.
Explanation:
unable to understand ur question,,,sry!