Answers
Answer:
0.04 °C⁻¹
Explanation:
First, we need to calculate linear expansivity, then after finding that value, we can move on to finding the area expansivity.
=============================================================
Finding Linear Expansivity :
⇒ α = Final length - Original length / (Original length × ΔT)
⇒ α = 9 - 4 / (4 × 70 - 20)
⇒ α = 5 / 5 × 50
⇒ α = 0.02
============================================================
Finding Area Expansivity :
⇒ Area Expansivity = 2 × Linear Expansivity
⇒ β = 2 × α
⇒ β = 2 × 0.02
⇒ β = 0.04 °C⁻¹
Calculate the value of the area expansion of a steel rod of lenght 4cm at 20°c after heating attains another length of 9cm at 70°c.
Area = 0.02
Area Expansity = [tex]0.0 {4}^{ - 1} [/tex]
Related Questions
Greta is on the chairlift going up the mountain when one of her skis falls off.
The ski has a mass of 5 kg and hits the snow below with a speed of 72 km/h.
How high is the chairlift above the snow when the ski falls off?
(Ignore air resistance.)
Answers
The height of the chairlift above the snow when the ski falls off is determined as 20.4 m.
Conservation of energy
The height of the chairlift is calculated from the principle of conservation of mechanical energy as shown below;
P.E = K.E
mgh = ¹/₂mv²
gh = ¹/₂v²
h = v²/2g
where;
v is speed of the ski when it hits the snow below = 72 km/h = 20 m/sg is acceleration due to gravityh = (20)²/(2 x 9.8)
h = 20.4 m
Thus, the height of the chairlift above the snow when the ski falls off is determined as 20.4 m.
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Define the term rest and motion with one example of each.
Answers
Explanation:
What is rest ?
A body is said to be rest if it does not change its position with respect to its surroundings.....Example:a book on the table .....( it does not change its position with respect to the table )
What is motion ?
A body is said to be in motion if it can change its position with respect to its surroundings....Example : a football kicked by a player.....[tex]...[/tex]
Question : What is Rest ?
Answer : An object is said to be at rest if it does not change its position with respect to its surrounding time .Example ...
StatueSleepingstaringstandingunmoved vehiclestopped clockDress kept in a hanger untouched sitting etc......Question : What is Motion ?
Answer : An object is said to be in motion if it position changes with respect to its surrounding and time .Example ....
The moving FanThe dust falling from the carpetThe water that flows from the tapa ball rolling around a moving car etc ......HOPE IT HELPS UPLEASE MARK AS { BRAINLIEST }Marking as brainliest last attempt
(ZOOM IN THE PHOTO) use the graphic organizer for writing ur paragraphs
write a paragraph about the topic : bullying in schools
Answers
On other occasions, bullying can sprout from jokes, possibly because the bully can’t find another way to make friends/make people laugh. It can mostly come from the bully’s own insecurities, they typically reflect them onto the victim
(Hope this is good! Sorry for any inconvenience)
Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?
increasing the inertia of the car
decreasing the reaction force
increasing the action force
decreasing the mass of the car Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?
increasing the inertia of the car
decreasing the reaction force
increasing the action force
decreasing the mass of the car
Answers
The change which shows the best application of Newton’s laws of motion to achieve this goal is decreasing the mass.
What is Newton's second law of motion?It states that the force F is directly proportional to the acceleration a of the body and its mass.
F =ma
or a = F/m
The mass and acceleration are inversely proportional to each other. If mass is decreased, then the acceleration is increased.
Thus, the mass should be decreased to increase the acceleration.
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Answer: D
Explanation: Just did EDGE
a tape is weighed and found to weigh 1.95 lb. the overall length of the 100-ft tape (end to end) is 102.00 ft. the specific weight of steel is 490 lb/ft?. what is the cross-sectional area of the tape?
Answers
The cross-sectional area of the tape is determined as 3.9 x 10⁻⁵ ft².
Volume of the tape
The volume of the tape is calculated as follows;
volume = mass/density
volume = (1.95 lb)/(490 lb/ft³)
volume = 3.98 x 10⁻³ ft³
Area of the tapeV = AL
A = V/L
A = 3.98 x 10⁻³ ft³/102 ft
A = 3.9 x 10⁻⁵ ft²
Thus, the cross-sectional area of the tape is determined as 3.9 x 10⁻⁵ ft².
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Which term does the phrase "an explanation of a natural phenomenon that is supported by facts gathered from many scientific investigations" best describe?
Answers
From what we know, we can confirm that the phrase in the question best describes the term "Theory".
Why does this describe the word "Theory"?We can say that this is the exact definition of a theory. In other words, a theory is an idea or hypothesis proposed as a possible solution to a known problem, which is backed up by facts and conclusions derived from many scientific experiments and investigations.
Therefore, we can confirm that the phrase in the question best describes the term "Theory".
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The slope of this graph is _____.
Answers
The slope of the illustrated graph would give us the velocity of the object whose motion is plotted in the graph.
What is velocity?Velocity refers to the rate of movement of objects along a particular line. In other words, the velocity of an object is the speed of the object in a specific direction relative to time.
Also, velocity = displacement/time.
In the graph, the slope is given by: Δy/Δx = displacement/time = velocity.
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An object is moving along the x axis. At t = 5.6 s, the object is at x = +3.0 m and has a velocity of +5.7 m/s. At t = 8.5 s, it is at x = +9.0 m and its velocity is -1.0 m/s. Find the average acceleration between t = 5.6 s and t = 8.5 s.
Answers
The average acceleration between t = 5.6 s and t = 8.5 s is 2.31 m/s²
What is acceleration?Acceleration is defined as the rate change of velocity with time.
acceleration a = (Δv) / (Δt)
An object is moving with initial velocity u =5.7 m/s and its final velocity v= -1.0 m/s.
Time taken for the change in speed, t= 8.5 - 5.6 = 2.9 seconds
The acceleration is given by
a = (-1 - 5.7)/ 2.9
a = - 2.31 m/s²
|a | = 2.31 m/s²
Thus, the object's acceleration is 2.31 m/s²
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Think about the videos you have watched.
Why is there a need for government regulation, and what limits need to be placed on these regulations?
Give your answer in the form of a short paragraph.
Answers
Answer:
they protect public safety and market fairness. For example, food safety regulations help protect consumers from pathogens that could cause widespread illness
Answer:
Government regulations are necessary because they protect public safety and market fairness. For example, food safety regulations help protect consumers from pathogens that could cause widespread illness. By creating regulations, the government can make food-borne illness less likely. However, even though these regulations are necessary, they must still meet constitutional requirements. Producers and consumers have the right to own and use property, among other constitutional rights.
Explanation:
EDGE 2023
What explains the key difference between a bomb calorimeter and a coffee cup calorimeter?.
Answers
The key difference between a bomb calorimeter and a coffee cup calorimeter is high temperature.
What is bomb calorimeter?A bomb calorimeter is an apparatus that can measure heats of combustion, used in various applications such as calculating the calorific value of foods and fuels.
What is coffee cup calorimeter?A coffee cup calorimeter is a cup used to provide insulation when materials are mixed inside of it.
Difference between the two calorimeterThe coffee cup calorimeter can't be used for high-temperature reactions, either, because they would melt the cup. A bomb calorimeter is used to measure heat flows for gases and high-temperature reactionsLearn more about calorimeter here: https://brainly.com/question/1407669
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1. The sun radiates light from space to heat a swimming pool on Earth.
a. Sound energy to light energy
b. Kinetic energy to nuclear energy
c. Light energy to thermal energy
Vesna bauoz of ya
visne ismert
d. Chemical energy to mechanical energy
Answers
Answer:
c. Light energy to thermal energy
Explanation:
The energy from the sun comes in the form of light energy but is converted to thermal energy.
Which two types of waves can transmit energy through a vacuum?
1.radio waves
2.seismic waves
3.sound waves
4.water waves
5.x-rays
Answers
Given what we know, we can confirm that amongst the wave types mentioned both X-rays and radio waves are able to transmit energy through a vacuum.
How can these waves propagate through a vacuum?This is due to the fact that unlike sound, water, and seismic waves that transmit energy through air, water, or the earth, the waves mentioned above, those being radio and x-rays, do not need a medium through which to propagate. This allows them to exist and transmit energy even in a vacuum such as outer space, which is corroborated by their existence in space.
Therefore, we can confirm that amongst the wave types mentioned both X-rays and radio waves are able to transmit energy through a vacuum.
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Answer:
we can confirm that amongst the wave types mentioned both X-rays and radio waves are able to transmit energy through a vacuum.
Explanation: Edmentum
Which quantity is a vector quantity?
A.
displacement
B.
distance
C.
mass
D.
temperature
E.
volume
Answers
Explanation:
displacement, velocity, and acceleration are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars. To qualify as a vector, a quantity having magnitude and direction must also obey certain rules of combination.
If four grams of matter are converted to their equivalent amount of energy, how much energy is released? Show your work.
Answers
Answer:
Equation of Special Relativity
[tex]E=mc^2[/tex]
where:
E = energy (measured in Joules)m = mass (measured in kilograms)c = speed of light where [tex]c \approx 3 \times 10^8 \: \sf ms^{-1}[/tex]First, convert 4 g into kilograms as mass is measured in kg:
[tex]\implies \sf 4\:g = 0.004\:kg=4 \times 10^{-3}\:kg[/tex]
Substitute the given values into the equation and solve for E:
[tex]\begin{aligned}E & = mc^2\\\implies E & = \sf (4 \times 10^{-3}) \cdot(3 \times 10^8)^2\\& = \sf (4 \times 10^{-3}) \cdot (3^2 \times 10^{8(2)})\\& = \sf (4 \times 10^{-3}) \cdot (9 \times 10^{16})\\& = \sf 4 \cdot9 \times 10^{-3} \cdot10^{16}\\& = \sf 36 \times 10^{(-3+16)}\\& = \sf 36 \times 10^{13}\\& = \sf 3.6 \times 10^{14}\: \sf J \end{aligned}[/tex]
Use Albert Einstein's equation
E=mc²m=0.004kg
E=(0.004)(3×10⁸)²E=0.004(9×10¹⁶)E=3.6×10¹⁴JHow does the government involve in a child or young person’s upbringing in your
country?
Answers
The government are involved in a child or young person’s upbringing in my country by providing the right amenities and ensure the justice system is fair.
What is Upbringing?This is defined as the way an individual treated at a young age by older adults such as parents.
Providing amenities will ensure the upbringing of the child is easier and a fair justice system will help to control crime.
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The frequency of a certain sound is 440 Mz. What is the wavelength of this sound when the temperature of the air is (a) 20°C; (b) 30°C
Answers
Answer:
Explanation:
We know the frequency and the velocity, both of which have good units. All we have to do is rearrange the equation and solve for
λ
:
λ
=
v
f
Let's plug in our given values and see what we get!
λ
=
340
m
s
440
s
−
1
λ
=
0.773
m
A pendulum is lifted and released, causing the pendulum to oscillate in
periodic motion. If losses due to friction and air resistance can be ignored,
what types of energy conversions are involved in this system?
A. Energy is converted between gravitational potential, elastic
potential, and kinetic energy.
OB. Energy is converted between gravitational potential and elastic
potential energy.
C. Energy is converted between kinetic and elastic potential energy.
OD. Energy is converted between kinetic and gravitational potential
energy.
SUBMIT
Answers
Answer:
D. Energy is converted between kinetic and gravitational potential energy.
Explanation:
Calculate the power of a person that does 8kJ of work in 4 hours
Answers
[tex]\text{Power,}~ P = \dfrac{\text{Work done}}{\text{Time}}\\\\\\~~~~~~~~~~~~~=\dfrac{8 \times 1000~J}{4 \times 3600~ s}\\\\\\~~~~~~~~~~~~~~=\dfrac{80}{144}\\\\\\~~~~~~~~~~~~~~=0.56~ W[/tex]
Answer:
Explanation:
Energy used is power multiplied by time.
Power is energy used divided by time
8 kj is 8000 j
4 hours is 240 minutes
240 minutes is 14400 seconds
8000j divided by 14400 is 0.55 recurring, measured in watts
The hall voltage is the potential created across a current-carrying metal-strip when the strip is placed in a magnetic field perpendicular to the current flow in the strip. it is used as a research tool to probe the movement of charges in materials, as well as determining the blood flow rate. one fundamental use of the hall effect is the determination of the charge of the charge carriers. what of the following statements is true concerning the strips with a positive versus a negative hall voltage?
a) the top strip has positive charge carriers, and the electric field points in the same direction as the electric force.
b) the bottom strip has positive charge carriers, and the electric field and electric force point in the same direction.
c) the top strip has negative charge carriers, which get deflected to the top of the plate.
d) the bottom strip has negative charge carriers, and the magnetic force points upward along the plate.
Answers
The statements true concerning the strips with a positive versus a negative hall voltage are a and d.
What is hall voltage?
The hall voltage is the potential created across a current-carrying metal-strip when the strip is placed in a magnetic field perpendicular to the current flow in the strip. it is used as a research tool to probe the movement of charges in materials, as well as determining the blood flow rate.
The top strip possess positive charge carriers, and the electric field points are in the same direction as the electric force.
The bottom strip has negative charge carriers, and the magnetic force points upward along the plate.
This will create an equilibrium of the magnetic force and electrostatic force.
Thus, the correct option are a and d.
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How does gravity influence our solar system? Claim Evidence Reasoning
Answers
Answer:
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.
Explanation: Hope it helps you :))))
Have a good day
can be ignored, what will be the maximum height that the pendulum can
reach - that is, what is the height at point B? (Recall that g = 9.8 m/s²)
B
A
4
SUBMIT
15 m
O A. 30 m
OB. 20 m
OC. 45 m
OD. 25 m
Answers
The height at point B will be 30 m. Option D is corect.
What is simple harmonic motion?Simple harmonic motion is a form of periodic motion in which the restoring force on a moving item is proportionate to the amount of the object's displacement.
At the highest point the kinetic energy is equal to the potential energy on the maximum height h;
[tex]\rm mgh = \frac{1}{2} mv^2 \\\\ 2gh=v^2 \\\\\ h= \frac{v^2}{2g} \\\\\ h=\frac{14^2}{2 \times 9.81}\\\\\ h= 9.9 \ m[/tex]
The height at point B is calculated by adding the initial height to the obtained height as;
[tex]\rm h_B = 15+9.9 \\\\ h_B = 29.9 \ m \\\\ h_B=30 \ m[/tex]
The height at point B will be 30 m.
Hence, option D is corect.
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On Earth's surface at sea level, what is the weight of an object with a mass of 180 kg?
860 newtons
1764 newtons
400 newtons
200 pounds
Answers
Considering the definition of weight, on Earth's surface at sea level, the weight of an object with a mass of 180 kg is 1764 N.
What is weightMass is the amount of matter that a body contains and weight is the action exerted by the force of gravity on the body.
The mass of an object will always be the same, no matter where it is located. Instead, the weight of the object will vary according to the force of gravity acting on it.
The weight is calculated as the product of the mass of the object and the value of the gravitational acceleration or gravity:
Weight= mass× gravity
The value of the acceleration constant on Earth is 9.8 m/s². The weight is proportional to the mass of the object. The unit of weight is expressed in Newton (N).
Weight of the object in this caseIn this case, you know:
mass= 180 kggravity= 9.8 m/s²Replacing on the definition of weight:
Weight= 180 kg× 9.8 m/s²
Solving:
Weight= 1764 N
Finally, on Earth's surface at sea level, the weight of an object with a mass of 180 kg is 1764 N.
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Which best explains how gravity contributes to the formation of layers in protoplanets?.
Answers
The following statement best describes how gravity helps protoplanets create layers in that gravity pulls materials and generates compaction, which produces heat and causes materials to melt, sink, and rise. Option A is correct.
What is gravity?Gravitation is a natural law by which all things with all matter are attracted towards one another. gravity causes weight to all matter and the gravity of the moon causes the ocean tides.
The force that draws massed bodies toward one another is known as gravity. Gravitatithus
According to the alternatives, gravity pulls things together and causes compaction, which generates heat and causes things to melt,
Thus, we may draw the conclusion that gravity draws materials and creates compaction, which generates heat and causes materials to melt, sink, and rise.
Hence option A is correct,
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Answer:
its A
Explanation:
V=I/R correctly expresses the relationship between voltage, current, and resistance.
True or False?
Answers
Answer:
False
Explanation:
It is actually I = V/R and V = I × R
The resulting net force of an object is represented below.
→10 N
Which most likely represent the forces acting on the object?
↑ 63 N and ↓ 73 N
↑ 97 N and ↓ 87 N
← 63 N and → 73 N
← 97 N and → 87 N
Answers
Answer: it's c. ← 63 N and → 73 N
Explanation:
Which best describes deena’s error? the line for constant velocity is not horizontal; it is diagonal and slopes downward. the area of the rectangle and the triangle under the line should be added together for constant acceleration find acceleration by finding the area of the rectangle above the line. find velocity by calculating the slope of the line.
Answers
The statement best describes deena's error is: Find acceleration by finding the area of the rectangle above the line.
What is acceleration?Acceleration is given by the ratio of Resultant or total force acting on any object and the its mass.
Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity.
In the velocity time graph, the area under the curve shows the displacement of the object and the slope represents the acceleration.
Thus, the deena's error is Find acceleration by finding the area of the rectangle above the line.
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Answer:
What the other dude said
Explanation:
which two questions can be used to identify criteria for how successful the design of an efficient high altitude drone is?
A. Can it reach an altitude of 8,000 m?
B. Will it cost more than the last drone design?
C. Does it improve efficiency by 35%
D. Does it also work at low altitudes?
E. Will it become more popular than the last drone design?
Answers
Answer:
Explanation:
Remark
Though you do not know what height the previous drone reached, I would think reading 8000 m would be quite an accomplishment. Answer 1: A
B: I wouldn't pick B. Increased cost isn't going to contribute to design success.
C. If the efficiency is low to start with, increasing it some won't matter. On the other hand if the efficiency is moderate or good increasing it by 35% is a good thing. Let's hold on to this answer.
D: It has to work at low altitudes in order to work at high altitudes. I wouldn't pick D
E: Popularity is something you never know will happen. I think C is your best second answer.
Answer: A and C
Magnetic Field: is a region around the charged particle where the electric force is exerted on other charged particles.
True
False
Answers
A small aircraft accelerated down a runway at 4.0 m/s²
The aircraft started from rest and reached a speed of 34 m/s just before take-off.
Calculate the distance the aircraft travelled while accelerating.
Give your answer to 2 significant figures.
Answers
Given data in the problem :-
Acceleration (a) = 4.0 m/s^2Initial velocity (u) = 0 m/sFinal velocity (v) = 34 m/sDistance travelled by aircraft (S) = ?From Newton's Laws of Motion we know that ,
v = u + at [t = Time taken by aircraft to cover the distance]
⇒ 34 = 0 + 4t
⇒ t = 34/4 s
∴ t = 8.5 s
From Newton's Laws of Motion we also know that ,
S = u.t + 1/2a.t^2
⇒ S = 0×8.5 + 1/2 × 4 × (8.5)^2 m
∴ S = 144.50 m
Thus the distance travelled by the aircraft while accelerating is 144.50 meter .
grade 9 psyhics giving brainly pls answer 13 and determine if 12 is correct
Answers
Answer:
See below
Explanation:
At the rope end where Cliff is :
W = f x d
100 N * 18 = 1800 J of work input
13.) At the weight end
work done = f x d
= 500 N * 3 m = 1500 J of work output
Cliff only got 1500 J of work OUTPUT with 1800 J of work INPUT
1500 / 1800 = 83.33 efficiency