Answer:
B
Explanation:
Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.
Heat flows spontaneously from hot to cold, and entropy increases.
The second law of thermodynamics relates to the entropy of a system. According to the second law of thermodynamics, the total entropy of a system may increase or remain constant in a spontaneous process.
The implication of this is that the entropy of a system never decreases. The entropy of a system increases when heat flows from a hot to a cold body and not vice versa.
Hence, the statement that; "Heat flows spontaneously from hot to cold, and entropy increases" describes the second law of thermodynamics.
Charge q is 1 unit of distance away from the source charge S. Charge p is two times further away. The force exerted
between S and q ls the force exerted between S and p.
Answer:
The correct answer will be "1/16".
Explanation:
The force or distance between two substances in charge seems to be inversely proportional to the square of the size of the particles.
The exerted force between "S" and "q" will be:
⇒ [tex]Fsq=\frac{{Q}'}{Q} 1^2[/tex] ...(equation 1)
The exerted force between "S" and "p" will be:
⇒ [tex]Fsp=\frac{{Q}'}{Q} 4^2[/tex] ...(equation 2)
Now,
On the comparison of "equation 1" and "equation 2", we get
⇒ [tex]\frac{1}{16}[/tex]
Someone please help me with this
1. A guitar string vibrates with a frequency of 100 Hz and it has a wavelength of 3 cm. Determine the speed of the wave that goes through that guitar string.
2. The speed of sound waves in air is around 340 m/s. Suppose that you hear a dog growl, and the frequency of the growl is 70 Hz. Determine the wavelength of the growl sound waves.
3. You are in a boat on the ocean. Some waves come by and you feel your boat move up and down. You whip out a stopwatch and find that you go up-and-down once every 5 seconds. So, the period of the wave is 5 s. You are watching the waves as you go up-and-down, and you see that the wave crests are 15 meters apart. So, the wavelength is 15 m. Use this information to calculate the speed of the waves.
4. Explain why these two waves have the same speed, even though some of their wave properties are different.
Wave A has a frequency of 3 Hz and a wavelength of 5 m
Wave B has a frequency of 6 Hz and a wavelength of 2.5 m
Answer: I think 1 is 300 metres per second.
Explanation: wave speed= wave length x wave frequency
wave speed = 3 x 100
wave speed is 300 m/s
Light ray A moves from air to water. Part of ray A is reflected at the air-water boundary. Which arrow in the image is the reflected ray?
E
OA. B
OB.
С
OC.
D
OD. E
Answer:
A. B
Explanation:
The image has been attached.
Reflected ray refers to the ray of light which is reflected back after striking a surface that is non-permeable.
The ray of light which is reflected before the ray touches the surface is said to the incident ray.
According to the given image, ray B is the reflected ray. Ray B is reflected in the air after the ray A strikes at the surface of the water.
B
Explanation:
Since mirrors reflect things, when you shine light at a mirror, it will bounce off of the mirror, or reflect, and shine the opposite direction of where the original light is pointed. The answer would be B because light doesn't go through the mirror, or run along it.
Think of when you through a basketball on the ground. If you bounce it at an angle, it won't just come back to you in the same angle. It will keep bouncing at the same angle you through it. This is pretty much what describes the relationship between ray A and ray B.
HOPE THIS HELPS!!!!!
2) Light reflects off of surfaces. It is also absorbed by opaque materials
and transmitted through transparent objects. Consider this diagram of
tvo sheets of construction paper. Elaborate on the behavior of the
incident light waves
A)
White paper reflects the incoming waves, while black
absorbs the incoming waves.
White paper reflects some of the incoming waves,
while black absorbs all of the incoming waves.
B)
Q
The white paper absorbs and transmits light waves,
while the black paper absorbs all light waves.
Some of the light waves incident on the white paper
D) are reflected and some are absorbed. None of the
Light waves are reflected from the black paper.
Answer: B
White paper reflects some of the incoming waves,
while black absorbs all of the incoming waves.
Explanation:
Light is reflected off of white surfaces. Light is absorbed by opaque materials and transmitted through transparent objects.
In the case of a white paper, a white paper can be considered as a translucent material in which some of the light incident on it bounces off while some pass through it. Therefore, we can conclude that White paper reflects some of the incoming waves,
while black absorbs all of the incoming waves.
HIME REMAIN
58:15
If business owners want to increase demand for their goods and services, what is the best action for them to take?
increase their models
increase their projections
decrease their prices
decrease their quantities
Answer:
decrease their prices
Explanation:
If we see demand curve then we can observe that demand for good decreases when price increases and demand for good increases when price decreases.
We also know intuitively that customer are price sensitive. That is their buying behavior changes with price of goods, Consumers prefer lower priced good.
So, if business owners want to increase demand for their goods and services
they should decrease their prices.
What is the photoelectric effect?
A the absorption of particles by a metal surface that is exposed to red light or infrared rays
B the proportional relationship between a photon's energy and the frequency of light.
C the emission of electrons from a metal caused by light striking the metal
D the ability of specialized photons to bounce off a metal surface.
Answer: C
the emission of electrons from a metal caused by light striking the metal
Explanation:
Photo means anything related to light in Physics and science generally.
Photoelectric effect explains the effect of light incident on metal surfaces by knocking out electrons on the metal surfaces.
The correct option is C
the emission of electrons from a metal caused by light striking the metal
Describe the relationship between frequency and wavelength
Answer:
Frequency and wavelength are inversely related.
Explanation:
Frequency and wavelength have an inverse relationship because if one thing goes up another goes down. For example, if frequency goes up, the wavelength goes down and vice versa.
Answer:
The relationship between wavelength and frequency is that the frequency of a wave multiplied by its wavelength gives the speed of the wave.
Explanation:
Frequency and wavelength are related terms also, used to describe electromagnetic radiation or light. One simple equation is used to convert between them: frequency x wavelength = speed of light. λ v = c, when λ is wavelength, v is frequency, and c is the speed of light.
I know I'm really late but I hope this helps lol
What is a good analogy for potential energy in a circuit?
Answer: find the answer in the explanation
Explanation: The potential energy in a circuit between two points is the workdone in taking units positive charge from one point to the other in the circuit. Its S.I unit is Joule.
Because voltage of a battery or cell in a circuit is the potential energy difference across its terminal
The potential energy difference between two points is one volt, if the workdone in taking one Coulomb of positive charge from one point to the other is one Joule.
hi:) is question 6 correct?
-- When you see the words "uniform speed", that means the car's speed is not changing.
-- Right under those words in the picture, there's a note to remind you that "uniform speed" also means "acceleration is zero".
-- The whole key to this question is to find out if you remember that acceleration and net force always go together.
.==> If there's net force, then there's acceleration.
.==> If there's acceleration, then there's net force.
.==> If there's NO net force then there's NO acceleration.
.==> If there's no acceleration, then there's no net force.
-- In this picture, there's no acceleration, so there's no net force.
-- The driving force on the car is 2000N forward.
-- But the car's speed is not changing, so the net force on the car must be zero.
-- So that 'resisting' force pulling the car backwards must be 2000N. Then the net force on the car adds up to zero.
-- If the resisting force pulling the car backwards is not zero, then the net force on the car would not be zero, and the car's speed would be changing.
what type of circuit is shown?
open parallel circuit
closed parallel circuit
closed series circuit
open series circuit
Answer:
open series circuit, (c)
Explanation:
Please help and show workings.
Effective resistance = 2+1.5 = 3.5 ohms
Current in the circuit = 1.2 A
Lost volts in the battery = 1.8V
Current in one of the 3 ohms resistors = 0.6 A
I hope it helps
What is needed to change a solid to a gas ?
Answer:
add energy
Explanation:
bc adding heat is energy which can make water turn into gas.
What is the proper function of a linkage? *
1 point
a) transferring energy
b) transferring speed
c) transferring money
d) transferring weight
asap plz, for science loverz
brainliest for the best answer!
Answer:
a) transferring energy
Explanation:
A linkage is an assembly of parts connected together to control forces and movement. The connections between links are called joints and are used for ensuring movement, pure rotation or sliding.
Linkages provides a means in which kinetic energy is being transferred in different directions within a system. This Linkages can be used to Change force direction, size of force applied or the motion created by the force.
The temp of equal masses of three different liquids A,BandC are 12°C,19°Cand 28°Crespectively . The temp when A and B are mixed is 16°C, and when Band C are mixed is 23°C.The temp when A and C are mixed is
Answer:
19.1°C
Explanation:
If A and B mix to give 16°C, A has risen by 4°C and B has fallen by 3°C;
If B and C mix to give 23°C, B has risen by 3°C and C has fallen by 5°C;
This means the energy transfered to cause a change of 3°C in B causes a change of 4°C in A and 5°C in C;
We can use this as a ratio (4:5);
The temperature difference between A and C is 16°C;
we add the two parts of the ratio (4+5) to get 9 and divide the temperature difference to get 16/9;
Next we multiply this by one of the parts of the ratio, so with 4, you get 64/9;
This number is the proportional temperature change in A upon mixing;
We then add this to the original temperature of A to get the resultant temperature of the mix like so:
64/9 + 12 = 19.1111...
You can do this alternatively using the other part of the ratio;
We would multiply the 16/9 by the 5 instead of the 4 to get 80/9;
This number is the proportional change in temperature in C upon mixing
Then subtract this from this from the original temperature of C and you should get the same answer:
28 - 80/9 = 19.1111...
What is general relativity
What was Neptune's distance from the Sun in 1989?
Answer:
4.5 Billion km :)
Explanation:
thats how it is
Answer:
About 3.8 billions miles from the Sun OR 4.82 kilometers
hope this helped!
what type of circuit is shown?
A. open parallel circuit
B. open series circuit
C. closed parallel circuit
D. closed series circuit
Answer:
A. open parallel circuit im pretty sure
Explanation:
Answer:
D
Explanation:
The bulbs are on the same wire as the battery, so its series. Current is flowing so its closed.
:What will be the value of the refractive index of the medium? Critical angle of that medium is 30 degree
a) 2
b) 1.5
c) 1.8
d) 1
Answer:
Let the second medium be air (n₁=1)
The refractive index n₂ of the medium where first medium is air is found (a)
(a) n₂ = 2
Explanation:
Critical angle can be defined as the angle of incidence that provides the angle of refraction of 90°.
Refractive index of a medium can be defined as a number that describes that how fast a light will travel through that medium.
Critical angle and Refractive index are related by:
[tex]\theta_{critical}= sin^{-1}(\frac{n_1}{n_2})[/tex]
[tex]sin \theta_{critical}=\frac{n_1}{n_2}[/tex]
To find refractive index of medium with respect to air, substitute n₁=1 (Refractive index of air is 1)
Also θ(critical)=30°
Find n₂ :
[tex]sin30= \frac{1}{n_2}\\0.5=\frac{1}{n_2}\\n_2=\frac{1}{0.5}\\n_2=2[/tex]
Which of the following is an example of a chemical change
A helicopter travels west at 80 mph. It is moving above a car traveling on a highway at 80 mph. Given this information, you can determine that the helicopter and car are traveling ____.
Select one:
a. in the same direction
b. in different directions
c. at the same speed
d. at the same velocity
Answer:
d. at the same velocity
Explanation:
I will assume the car is also travelling westward because it was stated that the helicopter was moving above the car. In that case, it depends where the observer is. If the observer is in the car, the helicopter would look like it is standing still ( because both objects have the same velocity). If the observer is on the side of the road, both objects would be travelling at the same velocity. Also recall that, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes but speed is the rate at which object covers distance and it is not direction wise. Hence velocity is the best option.
Answer:
C. At the same speed
Explanation:
I just took the exam and got the answer correct
Force = 7kN
Pressure = 1mPa
Area = ?
Answer:
7 m^2
Explanation:
P=F/A
1=7/A
1A=7
A=7
Area is 7 meters squared
What caused the mistake that led to the destruction of the Mar's rover?
Answer:
Metric Math Mistake Muffed Mars Meteorology Mission. 1999: A disaster investigation board reports that NASA's Mars Climate Orbiter burned up in the Martian atmosphere because engineers failed to convert units from English to metric
Explanation:
hope this helps =)
The direction of a vector that points somewhere between due north and due
east is measured in
A. centimeters
B. degrees
C. hours
D. miles
Answer: B
Degree
Explanation:
The direction of vectors are always measured in angles starting from the north. That is, in an anticlockwise direction. But the unit of angle is degree. Therefore, the direction of a vector that points somewhere between due north and due east is measured in degree.
Answer:degrees
Explanation:
static electricty is the study of..
A buildup of charge
B electric discharges
C electric fields
D all of the above
Answer:
all of the above
Explanation:
i study this kind of stuff in school
if the distance from the source is doubled, what will happen to sound intensity
Answer: sound intensity will decrease to the one - fourth of its initial value.
Explanation:
The relationship between sound intensity and the distance obeys inverse square law, where the intensity of sound is inversely proportional to the square of the distance. That is,
I = 1/ r^2
Where
I = sound intensity
r = distance.
If the distance from the source is doubled, sound intensity will decrease in value to the one - fourth of its initial value.
I'M ON A TIMER Ingrid says that a red ball of clay appears red because the clay reflects red wavelengths. Simon says that the clay appears red because it allows red wavelengths to pass through it. Which statement best explains who is correct? Ingrid is correct. The clay appears red because it is opaque. Ingrid is correct. The clay appears red because it is a type of matter. Simon is correct. The clay appears red because it is opaque. Simon is correct. The clay appears red because it is a type of matter.
Answer:
Ingrid is correct. The clay appears red because it is a type of matter.
Explanation:
Explanation: It is A because it only shows red because it only reflects red. If it let any other color pass through it then it could reflect any color.
What is true about an electric field around a positive charge?
A The electric field points inward.
B The electric field points in both directions.
C The electric field points outward.
Answer:
C
Explanation:
the electric field point radically away from the charge
For a current to flow continuously through a circuit, the circuit must be:
Answer:
An electrical current is an electrical charge flowing around a circuit. Carried by billions of tiny particles called electrons, the charge is already in the wires.
Explanation:
There are three basic conditions for the electric current flow is to be given below:-
The loop must be shuttered where current throws occur. There must be some possible distinctions in the chain. The medium in which current flows will be a conductor (but flow in the semiconductor at a higher temp. current).
Buoyancy is a force that always acts in a _____ direction, exerted by a fluid on a body placed in the fluid.
Answer:
Upwards direction
Explanation:
The buoyancy force is caused by the pressure exerted by the fluid in which an object is immersed. The buoyancy force always points upwards because the pressure of a fluid increases with depth.
Answer:
Upwards direction
Explanation:
Liquefication occurs when
Answer: Liquefaction occurs when the structure of a loose, saturated sand breaks down due to some rapidly applied loading.
As the structure breaks down, the loosely-packed individual soil particles attempt to move into a denser configuration. Liquefaction most often occurs when three conditions are met:
loose, granular sediment or fill
saturation by groundwater
strong shaking
Answer:
heat is applied
Explanation:with metal and ice