1. A woman shuts her summer cottage up in September and returns to June. No one has entered the cottage in the meantime
Explain what she is likely to find, in terms of the second law of thermodynamics.
The hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).
What is second law of thermodynamics?The second law of thermodynamics states that, hot things always cool unless you do something to stop them. Or the total entropy of an isolated system can never decrease.
In other words, not all heat energy can be converted into work in a cyclic process.
Therefore, we can conclude that when the woman returns, the hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).
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Why are alloys made from many metals
Answer:
It add strength to the metal, along with other enhanced chemical properties. Hardness, machinability, and corrosion resistance are other properties that can be added or enhanced by creating an alloy.
I hope my answer helps you.
Why is glass a good insulator?(1 point)
Explanation:
Glass is good insulator because of the following reason:
It is poor conductor of heat and electricityIt doesn't allow the flow of current/electron between two atoms, ions or species.It can be easily prepared in industries.It is eco friendly, It does not lead to deforestation like wooden insulator does, and doesn't harm/pollute the environment like rubber and plastic insulator does.It can be used upto high temperature level because it have high melting point (1700°C)Thanks for joining brainly community!
Glass is considered a good insulator because of its special way its molecules are arranged and its properties.
Why is glass a good insulator?Glass is not like other solid materials because it doesn't have a regular structure. This messy pattern of atoms in glass makes lots of tiny holes and dirt in the material. Air bubbles and dirt make it harder for heat to move through the glass, so less heat moves through it.
Glass doesn't transfer heat easily because it has low thermal conductivity. Glass does not allow heat to move through it easily and helps to keep heat inside.
Glass does not easily let electricity pass through it. This means that it doesn't let electricity pass through easily. Glass cannot conduct electricity because it does not have any free electrons or mobile charged particles.
Glass allows infrared radiation, which is a type of heat energy, to pass through it. Glass lets light in but stops some heat from getting through.
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Whoever is good at physics, can you help me with these questions?
Answer:
i honestly do not know the awnser , im just setting up my brainly account
Answer:
Q)32) What is the unit of intensity of sound
Ans)Decibel
Q)33) Relate amplitude and distance to the intensity and loudness of sound
Ans)The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. (i can't find the answer for distance and loudness i can't find it on g....o...o....g....l.....e and my textbook u will have to search it on ur own sorry)
Q)34) What is the pitch of sound
Pitch is the rise and fall of our voice when we speak. It is the characteristic of sound by which we can distinguish the sounds of the same loudness. Types: Pitch is generally of two types, high pitch and low pitch. High Pitch: The higher the frequency of the sound, the higher will be the pitch.
Q)35) How is pitch of sound related to its frequency of sound waves?
The sensation of a frequency is commonly referred to as the pitch of a sound. The pitch of the sound we hear depends on the frequency of the sound wave. A high frequency sound wave has a high pitch, and a low frequency sound has a low pitch.
Q)36) Define the Doppler effect?
The apparent change in the frequency of sound due to the relative motion between the source and the observer is called the Doppler effect.
Q)37) Explain why the doppler effect occurs
The Doppler effect, or Doppler shift, occurs when the movement of an observer relative to a source (or vice versa) causes a change in wavelength or frequency.
Sorry i can't find the last one i will try to search it afterwards
Hello people ~
Question: A hemisphere is uniformely charged positively. The electric field a point on a diameter away from the centre is directed
(a) perpendicular to the diameter
(b) parallel to the diameter
(c) at an angle tilted towards the diameter
(d) at an angle tilted away from the diameter
As the electric field is present at a point on diameter the electric field intensity at the electric field components are parallel to the diameter hence they cancel out .
So the field is directed perpendicular towards the diameter
Option A
problem: Asteroid Field.
Answer:
An asteroid is a minor planet of the inner Solar System. Historically, these terms have been applied to any astronomical object orbiting the Sun that did not resolve into a disc in a telescope and was not observed to have characteristics of an active comet such as a tail.
Hello people ~
Quantisation of charge implies _____
(a) charge cannot be destroyed
(b) charge exists on particles
(c) there is a minimum permissible charge on a particle
(d) charge, which is a fraction of a coulomb is not possible.
(d) charge, which is a fraction of a coulomb is not possible.
Explanation:
Quantisation implies that the charge, which is a fraction of a coulomb is not possible.
charge which is less than that on electron is not possible.everything has a charge (electrons)Basic minimum charge = 1.6 x 10⁻¹⁹
Answer:
Option D
Explanation:
Let's see
According to quantization of charge property
Q=ne wher n is a integerSo
it means that charge should be integer always like 5e,-7e ,3C etc.
But
frcation of coulomb denotes to rational number i e set Q hence its not possible
A light wave was calculated to have a length of 4x10^-7 m. what would the energy in the wave be?
λ = 5 x 10^-7 m, i.e the wavelength
to find:the energy in the wave.
solution:= c / λ
c =( 3 x 10^ 8 m/s)
f = 3x10^8ms-¹ /5 x10^-7m
= 6x10^14 Hz.
Questions #4, 5, and 6:
Part 1 of 3: Two moles of helium gas initially at 335 K and 0.58 atm are compressed isothermally to 1.44 atm. Find the final volume of the gas. Assume that helium behaves as an ideal gas. The universal gas constant is 8.31451 J/K · mol. Answer in units of m³.
Part 2 of 3: Find the work done by the gas. Answer in units of kJ.
Part 3 of 3: Find the thermal energy transferred. Answer in units of kJ.
For two moles of helium gas initially at 335 K and 0.58 atm are compressed isothermally to 1.44 atm, The solutions are is mathematically given as
V2=0.03818 m3W=-5.065KJQ =5.065 KJWhat is the final volume of the gas?Generally, the equation for the Ideal gas law is mathematically given as
PV=nRT
Therefore
V1=2*8.31451*335/(0.58*1.01325*105)
V1=0.09479 m3
Also
V2=V1*(P1/P2)
V2 =0.09479*(0.58/1.44)
V2=0.03818 m3
b)
W=nRTLn(V2/V1)
W=2*8.31451*335*Ln(0.03818/0.09479)
W=-5.065KJ
c)
In conclusion, Heat energy
Q=-W
Q =5.065 KJ
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You travel 200 kilometers in the first two hours. During the next hour, you stop for lunch and only travel 25 kilometers. What was your average speed?
Answer:
75 km/hour
Explanation:
Total distance travelled= 200+25 = 225 km
Total time= 2+1 hours = 3 hours
Average speed= Total Distance/Total time = 225/3 = 75 km/hr
Name all the energy transfers that occur to make a solar-powered traffic light work (name what generates the energy, and what kind of energy it turns to):
What is a common characteristic of outer planets?
Answer:
They are all composed of gases.
Explanation:
The inner planets are mainly composed of types of rock. The surface and interior is rocky but the atmosphere is composed of gases. The outer planets happen to be composed mainly of gas, or in other terms, elements. The two primary elements that make up these planets are hydrogen and helium. Because the inner planets are made up of primarily, they have given the nickname the "Terrestial Planets" and the outer planets are called "Gas Giants" because of their gas (elements) composed atmospheres and overall interiors.
Answer: A: they are composed of gas
Explanation:
Which name is given to the force that stretches the spring with a metal that weights it down
Answer:
gravity
Explanation:
ok what i understand from your query is that a spring balance with a metal piece attached to it is weighing it down, a spring balance is measured in newtons (f=ma), the acceleration part is gravity (-9.81 m/s^2). The metal piece is attached to the string.
hope this answers your question and please take my answer with a grain of salt and refer to some webpages or videos
A man standing between two walls fires a gun and hears two echo. if he stands 200m closer to one of the wallsand the time differenve between the two echos is 0.176seconds,detrmine the distance between the walls(sped of sound in air is 340m/s)
Answer:
850m
Explanation:
The answer should be 850m
I apologize if it is incorrect-
Have a great day!
Anygays-
Use the table to answer the question.
Planet
Estimated Mass of Planet (1024 kg)
Venus
4.87
Mars
0.642
Jupiter
1.898.0
Neptune
102.0
A spacecraft flies within 500.000 km of each of these planets. Which one would gravitationally attract the spacecraft the most?
3
Venus
Mars
Jupiter
Neptune
Answer:
Jupiter is by far the largest.
G = K M / R^2 = K C M since R is given as 5E5 km
G = gravitational attraction
You are sitting at a coffee shop and you overhear a conversation at the next table. Two mothers are discussing their teen children and complaining about their behavior- erratic and irrational behavior, displaying little to no logic and reason. One says to the other, I just don’t know who he is. You have just listened to the NPR article and learned about the Endocrine System. You offer the following advice……
Answer:
Explanation:
Our five-year-old, Gabriel, is a very bright, funny, charming little guy. But he still has a lot of tantrums, which we thought would be over by this age. He reacts very poorly to consequences. He will get very threatening and aggressive physically and verbally: slamming doors, hitting, and lashing out verbally. We are constantly negotiating with limit setting. When we hold to the limit, he will escalate and sometimes will have very intense tantrums that can last over 30 minutes. When he is happy, he is the most delightful child. But the second something doesn’t happen exactly how or when he wants it, he is explosive. We are totally exhausted
A student measures the voltage and current between two points in an electrical circuit. If the voltage is 220 V and the current is 1.2 A, what is the resistance, according to Ohm's law?
A. 2190
B. 2640
C. 1830
D. 0.0050
Answer:
Your answer is C
Explanation:
V=IxR
220 divide by 1.2=183.0
The answer was probably a type error so it should be C
For brainliest and 100 points
Ben is pushing a small trolley 10 N to the north and but Gary is pushing the trolley 5 N to the south. What is the total applied force on the trolley?
5N
2N
20N
40N
Answer:
The total applied force on the trolley is 5 N toward the North.
Explanation:
yes
Which planets are terrestrial? select three options. jupiter mars mercury uranus venus
Mars, mercury, and venus are the planets that are terrestrial planets.
What is the terrestrial planet?A terrestrial planet is one that is predominantly made up of silicate rocks or metals. The inner planets nearest to the Sun, are Mercury, Venus, Earth, and Mars, as terrestrial planets within the solar system.
Mars, mercury, and venus are the planets closest to the sun.
Hence mars, mercury, and venus are the planets that are terrestrial planets.
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A plane's propeller has a rotational inertia of 2.0kg * m ^ 2 After a clockwise torque of 4.0Nm was applied to the propeller for 4.0s, the propeller has a clockwise angular speed of 24 * (rad)/s What was the initial angular momenturn of the propeller before the torque was applied ?
The initial angular momentum of the propeller before the torque was applied will be 32 kg m²/s.
What is torque?Torque is the force's twisting action about the axis of rotation. Torque is the term used to describe the instant of force. It is the rotational equivalent of force. Torque is a force that acts in a turn or twist.
The amount of torque is equal to force multiplied by the perpendicular distance between the point of application of force and the axis of rotation.
The given data in the problem is;
The rotational inertia is,I = 2.0 kg m²
The clockwise torque is, T = 4.0Nm
The time period is,t= 4.0s,
The angular speed is,ω= 24 * (rad)/s
The initial angular momentum of the propeller is,I₀
The angular acceleration is found by the relation;
[tex]\rm \tau = I \times \alpha \\\\ \alpha =\frac{\tau}{i} \\\\ \alpha =\frac{4.0}{2.0} \\\\ \alpha= 2.0 \ rad/sec^2[/tex]
The initial angular velocity is found as;
[tex]\rm \omega_f = \omega_0 + \alpha t \\\\ \omega_0 = \omega_f -\alpha t \\\\ \omega_0 =24 -[(-2.0)\times 4.0)] \\\\ \omega_0 = 16 \ rad/sec[/tex]
The initial angular momentum of the propeller is found as;
[tex]\rm L_0 = I \omega_0 \\\\ L_0 = 20 \times (1.6) \\\\ I_0 = -32 \ kgm^2/s[/tex]
Hence,the initial angular momentum will be 32 kg m²/s.
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Answer: 14 kg•m2/s
Explanation:
Trust me it’s from khan
A loudspeaker diaphragm is oscillating in simple harmonic motion with a frequency of 379 Hz and a maximum displacement of 0.562 mm. What are the (a) angular frequency, (b) maximum speed, and (c) magnitude of the maximum acceleration
Answer:
f = 379 / s given
A) ω = 2 pi f = 2380 / sec
B) Vmax = ω A = 2380 / sec * .000562 m = 1.34 m.s
C) amax = -ω^2 A = -(2380)^2 * .000562 = -3180 m/s^2
An ideal gas, initially at a volume of 2.4 L and
pressure of 5 kPa, undergoes isothermal expansion until its volume is 6 L and its pressure
is 2 kPa.
A) Calculate the work done by the gas during
this process.
Answer in units of J.
B) find the heat added to the gas during this process.
Answer in units of J.
(a) The work done by the gas during this process is -10.8 J.
(b) The heat added to the gas during this process is 10.8 J.
Work done by the gas against an external pressureThe work done by the gas during the isothermal expansion is calculated as follows;
W(net) = ΔP x ΔV
W(net) = (2 kPa - 5 kPa) x (6L - 2.4 L)
W(net) = (-3kPa) x 3.6L
W(net) = -10.8 kPa.L
W(net) = -10.8 J
Heat added to the gasW = - Q
-10.8 J = -Q
Q = 10.8 J
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The headlights of a typical car are powered by a 12 v battery. What is the resistance of the headlights if they draw 3.0 A if a current when turned on
Answer:
4 ohms
Explanation:
V = I R
12 = 3 R
R = 4 ohms
The chemical combination of atom a and atom b would result in
Answer:
A molecule
Explanation:
A train travels north at 103 km/hr. Is this an example of speed, velocity, or acceleration?
Answer:
velocity
Explanation:
when a speed is given with a direction it is velocity
Answer:
Velocity
Explanation:
Velocity is the rate, and direction of an objects movement.
Speed is the rate of and objects movement, no certain direction.
Acceleration is the rate when velocity changes over time, it can both increase and decrease, and it has both speed and direction.
I hope this helps! Have a great day!
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Applying definitions Samantha ran 90 meters in 35 seconds to catch up with her dog. When she got to him, she played with him for 70 seconds before they walked back in 75 seconds. Did Saman tha travel at constant speed? What was Samantha's average speed?
No, Saman didn't travel at constant speed
v₁ = 90/35 = 2.57 m/s
v₂ = 0
v₃ = 90/75 = 1.2 m/s
Average speed = total distance/time
Average speed = (90+90)/(35+70+75) = 1 m/s
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature are their readings numerically the same
Answer:
To change degrees Celsius in degrees Fahrenheit, the formula is:
F = 1.8C +32F=1.8C+3
Explanation:
C = 1.8C +32C=1.8C+32
C = -40C=−40
T=-40+273.15=233.15\ KT=−40+273.15=233.15 K
A girl is travelling on her bike at a speed 2.54 m/s. If the girl and her bike have a kinetic energy of 193 J, what is the combined mass of the girl and her bike? Show all your work.
Answer:
About 59.83 kg
Explanation:
The formula for kinetic energy is [tex]KE = \frac{1}{2}mV^2[/tex], where KE = Kinetic Energy in Joules (J), m = mass in kilograms (kg), and V = Velocity in meters per second (m/s).
In this problem, we are given the Kinetic Energy amount as 193 Joules and the Velocity as 2.54 m/s. Let's plug it into our equation
[tex]193 = \frac{1}{2} * 2.54^2m[/tex]Now, let's solve this equation.
Step 1: Simplify both sides of the equation.
[tex]193 = 0.5 * 2.54 * 2.54 * m[/tex] [tex]193=3.2258m[/tex]Step 2: Divide both sides by 3.2258.
[tex]193/3.2258 = 3.2258m/3.2258[/tex] m ≈ 59.830 kilogramsIn science, a new hypothesis must be (mark all correct answers):
1. falsifiable by experimental testing or observations.
2. completely consistent with all previous laws and theories of science.
3. possible to prove correct.
4. based solely on physical causes.
Answer:
1, 2, and 3.
Explanation:
Hypotheses must be able to be proven false, otherwise it’s a law. It must be consistent with other theories otherwise it’s not true, and it has to be possible to prove correct, otherwise it’s a theory.
The true statement is "Falsifiable by experimental testing or observations." The correct option is 1.
In science, a hypothesis is a proposed explanation or prediction for a phenomenon or set of observations.
A new hypothesis is a fresh idea put forth by a scientist to explain a phenomenon or observation that has not been explained or understood fully by existing scientific theories or hypotheses.
The new hypothesis should be based on previous knowledge and observations, and it should be testable and falsifiable through experiments or observations. Scientists use hypotheses to guide their research and develop theories, which are more comprehensive explanations backed up by multiple lines of evidence.
Therefore, only Option (1) is the correct answer.
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If a 20g bullet has a momentum of 8kg calculate its velocity
Explanation:
I hope this helps, you can ask any questions for clarification
